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Serving Timex-Sinclair 
Personal Computers 


SYNTAX 

A PUBLICATION OF THE HARVARD GROUP 


VOL.4 NO.2 


ISSN 0273-2696 


FEB , 1983 


IN THIS ISSUE 


WINTER CONSUMER ELECTRONICS SHOW REPORT 


8K Programs 

Sweethearts.5 

Blast.5 

When You Forget 

Syntactic Sum.6 

Book Review 

Mastering Machine Code 

on Your ZX81.14 

49 Explosive Games 

For Your ZX81.18 

Classified Ads.19 

Dear Editor.10 

Hardware Review 

JK-310.17 

Hardware Tip 


Keyboard Conversion...16 
Machine Code Programming 


Concatenating Machine 

Code.6 

Mod To Use Hunter RAM 

with > 32K.18 

News, New Products.. 1,2,3 

On GOTO Statements.5 

Program Improvements....4 
Software Review 

Reversi.8 

Syntax Errors.4 

Users' Groups.4 

When You Forget Syntactic 
Sum.6 


Index to Advertisers 

Brainchild Computer.... 18 


Byte-Back Co.4 

CAI Instruments.14 

E-Z Key.8 

Frog Software.17 

Intercomputer Inc.7 

Kopak Creations, Inc...15 

Melbourne House.16 

Memotech Corp.12,13 

Sinclair Research, Ltd..9 

Sof tsync.11 


Timex's TS2040 thermal printer will hit the 
stores this quarter. Priced at $99.95, it 
matches both TS1000 and TS2000 machines in 
color and styling and works with either one. 

Timex will deliver TS2000S, the US ver¬ 
sion of the ZX Spectrum, during 2nd quarter 
1983. Priced at $199.95 for 48K RAM, this 8- 
color computer sets a tough value standard 
for others to meet. You'll also see a 16K 
version for $149.95. Timex also announced 
tiny (1 1/2 x 2 x 1/8) TS2000 cartridge 
software up to 32K ROM, priced below $25. 

SYNTAX thinks TS2000S will differ from 
Spectrum machines by more than TV scan rate. 
We expect Sinclair BASIC listings will be 
mostly compatible and programs with ROM calls 
or systems variables will need modification. 
TS1000 tapes need special software to load 
into TS2000S and then need modified system 
variables and translation to ASCII. 

As others hawked TS1000 clones for March 
or June delivery, Timex countered with a $15 
rebate on TS1000S during the first quarter. 

Mindware printers are in stores now and 
Mindware showed full screen dump on the MW100 
Sidewinder using 1 3/4" wide tape plus 132 
column x 12 line printouts printed lengthwise 
on the tape. We also saw Quickload operate— 
impressive, reliable and fast. 

For those who must check out competitive 
machines, you'll want to see these: B/W—TI 
99/2, Sanyo PHC20, and VZ200; Color—Mattel 
Aquarius, Sanyo PHC25, Spectravideo SV 318, & 
Panasonic JR 200 (Highest-priced last; all 
$99-299 at retail, available midyear). 

FORTH enthusiasts—look at the Jupiter 
ACE, designed by Stephen Vickers and Richard 
Altwasser. Available in the US from Data- 
Assette of Oxford, PA, this machine has FORTH 
in ROM with the Z80A processor bus available 
at the rear. Many ZX/TS accessories will 
work with special cables. 

Sinclair has discontinued kit sales. 


1 


























NEW PRODUCTS AND SERVICES 


Crash Guard, made of heavy acrylic, 
protects your 16K RAM from acciden¬ 
tal unplugging. $19.95, 10-day 
trial, satisfaction guaranteed. 
Expense Cutters Products Inc., POB 
9543, Raytown, MO 64133. 

Free machine code wall charts. 

Send mailing tube/large envelope 
with name, address, zip and 35 
cents for postage (stamps O.K.). 
Henri Poche', 5751 River Rd., New 
Orleans, LA 70123. 

Zip-sorted, adhesive-backed mailing 
lists available: US user groups 
(about 60), $6 ppd; software sup¬ 
pliers (about 200), $11 ppd; hard¬ 
ware suppliers (about 85), $6 ppd? 
ZX/TS owners being compiled, to 
add your name send it with address 
and zip. TSG Enterprises, 54 
Richwood PI., Denville, NJ 07834. 

Domino arcade game now available. 
Program on cassette, $9.95 check or 
MO. More info: JPR Software, Box 
4155, Winter Park, FL 32793. 

Biocal Software has a new free 
catalog. Send legal-size SASE to 
Biocal Software, 340 Cypress Drive, 
Fairfax, CA 94930. 

Plug-in MEMOCALC gives spreadsheet 
analysis of any table of numbers. 
Screen acts as a window to table. 
Maximum size of table is determined 
by memory capacity? with 64K, you 
get up to 250 rows or 99 columns. 
Performs iterative calculations and 
re-evaluates. Memotech Corp., 7550 
W. Yale Ave., Suite 200, Denver, CO 
80227, 303/986-1516. 

Blank C-5, C-10 and C-12 computer 
tapes, labels, packaging and mar¬ 
keting, data cassette duplication. 
PC board layout and manufacture for 
your hardware. Limited disk and 
EPROM duplication. Free brochure. 
Computer Engineering Services, P.0. 
Box 1222, Show Low, AZ 85901. 


Loan Analysis Program (needs 16K) 
reduced. Helps analyze loans, cal¬ 
culate compound interest and depre¬ 
ciation. Also calculates monthly 
payment for existing or new loan? 
duration of pay back on loan; af¬ 
fordable loan amount? amortization 
tables and more. On tape $9.95 
plus $1.50 P&H. R.S. Panwar, 2035 
Kentland Dr., Houston, TX 77067 

32K plus I/O unit gives 4 parallel 
I/O ports and 32K memory to ZX/TS. 
Unit plugs into back of ZX/TS and 
connects to other devices. Can 
interface to A/D converters and 
temperature probes through ports. 
Complete unit (4 ports, 32K, cables 
for ports, documentation) is $155 
+$4.95 P&H. Partially populated 
board (I/O ports and room for 32K 
expansion later) is $50+$4.95 P&H. 
Wisconsinc Electronics, POB 332, 
Milton, WI 53563. 

METAGRAPHICS creates drawings with 
over 2000 graphics characters and 
backrounds, $12.95. Needs 16K, on 
tape. Calliope Software, 4130 Coe 
Dr. NE, Albuquerque, NM 87110. 

GRAPHPAK features bar graphs, line 
graphs, pie charts and area graphs. 
Plots data and helps in financial 
planning. 10K BASIC program on 
tape is listable. $14.95 with 
P+H. Practical Computer Products, 
21111 Strathmoor Ln., Huntington 
Beach, CA 92646. 

Decision Maker helps you decide by 
helping you evaluate options. It 
scores points statistically and 
ranks options in order of benefit. 
Career Path is based on psychologi¬ 
cal theory linking personality to 
career decisions. Both need 16K, 
are user friendly, documentation, 
$14.50 each plus $1.50 P&H. Melear 
Marketing, 3615 Saxon Way, 

Marietta, GA 30062, 404/977-1295. 

SixPac includes FORTH interpreter/ 
compiler, spreadsheet, inventory 
management, calendar, household 


2 



budget, and data base management 
programs. Each program includes 
documented source listing and in¬ 
structions; needs 16K. Package, 
$24.95+$3 P&H. SofTek, Box 4232, 
Santa Fe, NM 87502. 

Prevent memory module "wobble and 
die" syndrome. RAMSTRAP holds RAM 
pack in place. $3, $3.50 outside 
US. RAMSTRAP, 104 Ridgeway Ave., 
Louisville, KY 40207. 

TS1000S with built-in rechargeable 
battery back-up protect against 
temporary power loss, also power 
16K RAM pack (not supplied). Power 
on/off switch and indicator LEDs 
provided. TS1000-B30 ($129.50 ppd. 
in US) runs on battery up to 30 
minutes, TS1000-B60 ($142.50) pro¬ 
tects against power loss up to 1 
hour. FOURIER Analysis and Synthe¬ 
sis evaluates harmonic content of 
repetitive waveform. Inverse oper¬ 
ation, constructing wave that re¬ 
sults from known harmonics, is also 
possible. Comprehensive data re¬ 
view, editing and graphing routines 
included. Tape includes sample 
runs and memory saver version for 
higher resolution. Needs at least 
16K; listing and documentation $12; 
listing, documentation, tape $17 
ppd. MULTIPROGRAM gives multiple 
program storage and assumes no pre¬ 
vious knowledge of MC programming; 
step-by-step instructions take you 
through block transfers. Needs at 
least 16K, tape and instructions 
$10 ppd. Battery back-up plans 
with schematics and parts list, $10 
ppd. Syncware Co., POB 5177, El 
Monte, CA 91734. 

f/22 Press cuts their 16K Darkstar 
darkroom package (Oct.82 New Pro¬ 
ducts) to $400. Tape with instruc¬ 
tions, $49.95. f/22 Press, Bx 141, 

Leonia, NJ 07605, 201/568-6250. 

Hunter's 8K nonvolatile RAM board 
kit now comes supplied one 6116LP3 
(150ns) CMOS RAM at no extra cost. 
Low power 6116 chip means lithium 


should last 10 times longer—fully 
populated board should retain mem¬ 
ory for about 2 years. Assembled 
and tested version, $46.90; Kit, 
$31.90 with P&H. Hunter, 1630 
Forest Hills Dr., Okemos, MI 48864. 

Draw and Recall lets you draw on 
your TV screen and store picture 
for later recall. Similar to Tur¬ 
tle graphics, enter an angle and 
distance, and program draws the 
line. Includes erase, move without 
drawing, delete, display screen 
position. Needs 16K, tape with 
directions $6.95 +$1.75 P&H. Plan 
displays with 8 1/2" x 11" graphic 
grids, with line and column num¬ 
bers, X and Y coordinate numbers. 
Pack of 100 $3.95+.75 P&H. New 
newsletter for ZX/TS owners, first 
issue free to SYNTAX readers; send 
SASE. Trig Teacher program teaches 
basic trigonometry, includes exam¬ 
ples. $6.95+$1.75, on tape with 
directions. Needs 16K. Friendly 
Computer, P.O. Box 122, Walling¬ 
ford, PA 19086. 

In-Line Load Monitor helps you load 
taped software every time. In-Line 
Voltage Dropper lowers computer 
voltage so computer and RAM pack 
run cooler. Assembled with direc¬ 
tions, $12.95 each plus $1.50 P&H; 
add 6% tax in NJ. M.C. Hoffman 
Co., POB 117, Oakland, NJ 07436. 

Big selection of ZX/TS-related US 
and Canadian products. Free mail 
order list for customers and full 
product listing for prospective 
dealers. Integrated Data Systems, 
11 Brighton Ave., Toronto, Ontario, 
Canada M4M 1P3, 416/466-5571. 

16K tape programs: Math Raiders, 
Superchess, Alpha and Vowel Tutor, 
and Night Gunner. The Adventures 
of Quest for the Holy Grail and The 
Elusive Mr. Big K give you a new 
version everytime you load. $14.95 
each except Superchess, $19.95. 
Softsync, 14 East 34th St., New 
York, NY, 10016. 212/685-2080. 


USERS' GROUPS 

Our latest list of new users' 
groups is presented below. To 
locate or announce a group not 
listed, drop us a line (please 
include self-addressed stamped 
envelope) or give us a call at 
617/456-3661. SYNTAX, RD 2, 

Box 457, Harvard, MA, 01451. 

Chateauquay, PQ, Canada: H. Oeder, 
305 Radisson, Chateauquay, PQ, 

J65 1W6 Canada, 514/691-4433. 


Holly Hill, FL: Richard Sirekis, 
941 Oleander Ave., Holly Hill, FL 
32017. 

Lubbock, TX: Wayne Hamlin, Box 
6342, Lubbock, TX 79413. 

Manhattan Beach, CA: J. Petersen, 

2316 Walnut Ave., Manhattan Beach, 
CA 90226, 213/545-9581. 

Milwaukee, WI: The ULTRAGROUP, 

6808 N. Park Manor Dr., Milwaukee, 
WI 53224. 


Gainsville, FL: Timex Users Group, 
3708 Newberry Rd., Gainsville, FL 
32607, c/o Skipper's Electronics 
904/373-6796. 


Glen Aubrey, NY: Sinclair Computer 
Users Society, P.0. Box 92, Glen 
Aubrey, NY 13777. 

Groton, MA: Sinclair users group 
for people under 16. Aarre Laakso, 
74 Ames Rd., Groton MA 01450. 


64K MEMORY 
M-64 $119. 9 £ t 

129.95 WIRED & TESTED 
IN STOCK. SAME DAY SHIPMENT 
All standard features included, plus lower 8K 
of RAM can be disabled in 2K segments to 
allow PROM or peripherals to be added. 


EXPAND YOUR 16K SYSTEM $59.95 

If you have a Sinclair 16K RAM module and neecT 
more memory, expand it to 32K and beyond by usinq 
BYTE-BACK M-16 MEMORY MODULES. 

You can’t connect two Sinclair 16K RAM modules together, 
but you can connect one Sinclair 16 K and one or more BYTE- 
BACK 16K modules to get all the memory you need 

THOUSANDS IN USE WITH PROVEN RELIABILITY 

M-16 $59 . 95 Kit. $69.95 wired and tested. 

_ IN STOCK. SAME DAY SHIPMENT 


BB-1 Control Module, with 8 relays, 8 leds 

& 8 inputs. $59 Kit. $69 wire and tested. 
__ IN STOCK! SAME DAY SHIPMENT 


MODEM with RS232 Port $119.^, 


90-Day Warranty On All Modules. 
10-Day Return Priviledge 
ORDER PHONE 803-532-5812 

Add $4.95 shipping & handling to all orders. 

BYTE-BACK CO. CHECKS 

Rt. 3 Box 147 Brodie Rd. I 

LEESVILLE, SOUTH CAROLINA 29070 


Puerto Real, PR: ZX/TS Users' 
Group, Sergio Perez Davila, Box 
38, Puerto Real, PR 00740. 

Santurce, PR: Max Ramirez de 
Arellano, Box 6759, Santurce, PR 
00914. 

SYNTAX ERRORS: Crash Guard, Jan. 
New Products, was listed at $10.95. 
Actual price is $19.95. 

John Jarrett of Computer Engineer¬ 
ing Services called to say that his 
video upgrade kit (adds SLOW mode 
to 8K ZX80s) does in fact work with 
new (bug-free) 8K ROMs if installed 
properly (Dear Editor, Jan. 83). 
Hint: the wire from point G must 
be separate and as short as possi¬ 
ble. C.E.S. no longer sells com¬ 
plete kits. Printed circuit board 
plus parts list and directions now 
$12.95. Computer Engineering Ser¬ 
vices, POB 1222, Show Low, AZ 
85901, 602/537-7522. 

M.C. Hoffman's catalog, Jan. New 
Products, costs $1 (refunded with 
order). The clip is free. 

PROGRAM IMPROVEMENTS/REFINEMENTS 


Richard Cox sent this change 
to speed play and add headings to 
BLACKJACK (Jan.-Apr. 82) : 


5 FRST 

©05 PRINT RT 
506 PRINT RT 
755 PRINT RT 
M DEfiLER" 


**6LRCKJRCK** 
18,0; * YOU" ;TfiB t*; 







SWEETHEARTS—8K/1K 


Draw a heart with a valentine 
message in the middle. You can 
change the message with 210 PRINT 
AT 6,11?"I LOVE YOU" and add your 
name at the bottom with 220 PRINT 
AT 18,20? "xxxxx" (replace xs with 
your name). To run, GOTO 30. 


Larry Allen, Owensville, IN 

1© PRINT RT R,B;CHR$ 151 

3© RETURN 

30 FOR R = 1 TO 4- 

4-0 FOR B=ll-R TO il+R 

50 GOSUB 1© 

60 NEXT B 

70 FOR B =20 —R TO 2© +R 
S© GOSUB 10 
9© NEXT B 
10© NEXT R 
110 FOR R=5 TO 9 
120 FOR B=7 TO 21 
13© GOSUB 1© 

14-© NEXT B 

15© NEXT R 

16© FOR R~10 TO 17 

17© FOR B=R—2 TO 33-R 

18© GOSUB 1© 

19© NEXT B 
20© NEXT R 

210 PRINT RT 6, 13; “HRPPV"; RT 7, 
11; " URLENT INE ** 

SYNTRCTIC SUM: 224-3©.. 8K ROM 

BLAST—8K/16K 


Combining Robert Nappi's Star 
Hunter (Nov.82) and Dan Tandberg's 
Blast Effects (Aug.82) with my own 
programming resulted in Blast. 

You fire your cannon by hitting 
0. Hit 7 to aim the cannon up and 
hit 6 to aim down. To RUN, GOTO 2. 
Inverse video lines are: 

2 "BLAST—A SHOOT OUT" 

60 "(space, 27 times)" 

200 "ER7" 

355 "SMASH" 

420 "YOU STINK—I WON" 


50 SLOW 
60 LET R*= 


St 


7© LET B $ = ** XXXXXXXXXXXXXXXXXXX 
XXXXXXXX" 

30 LET G* = " ***********3-****-*** 
9© LET 


IQ© LET 1$ = ** 

it 

11© LET u* = " 


120 LET R=ll 
130 LET B=© 

14-0 LET 0 = INT CRND+20J +1 
15© LET U =0+8 

16© IF O—R >W—B THEN GOTO 14-© 

17© CLS 

IB© PRINT RT 8,25;P 
20© PRINT RT R,B;"^»“ 

21© PRINT RT R + l ,B; " 

22© PRINT RT R-i,B; ** 

23© IF INKEY$ = **6* ! THEN LET R=R — 

1 

24.0 IF INKEY$="7" THEN LET R=R + 

1 


258 PRINT RT O, «;"<+>" 

26© LET U=U-R 

27© IF U<2 RND RBS CR-OJ <2 THEN 
GOTO 42© 

26© IF U <2 THEN GOTO 12© 

290 IF INKEY*="0" THEN GOTO 31© 
30© GOTO 20© 

31 © PRINT RT R,B+3;R*;RT R,B+3; 
B*;RT R,B+3;G*;RT R,B+3;H*;RT R , 
8+3;I*;RT R,B+3;J$; 

32© PRUSE 5 

34-0 IF R=0 THEN GOTO 350 


35© SOTO 200_ 

355 LET 

356 LET 

36© PRINT RT 0,U;K*;RT 0,U;U$;P. 
T 0,U;K$;RT 0,U;U*;RT 0,U;K$;RT 
O, U; U*; RT 0,U; K*; RT 0,U;U$ 


37© LET P=P+1S© 

38© PRUSE 2© 

390 IF P > 150© THEN GOTO 4-5© 
4-00 GOTO 12© 

42© PRINT RT 0,U;"| 


43© PRUSE 10© 

44© GOTO 2© 

45© CLS 

46© PRINT RT 15,©;"YOU UGN",,,, 
"WITH 9^1© LUCK RND l.«'l© BRRIN" , 
,,"TRY RGRIN" 

47© PRUSE 20© 

48© CLS 
49© GOTO 2 

SYNTRCTIC SUM: 11515, BK ROM 


ON GOTO STATEMENTS 


James Eischen, Windsor, CT 


1 SRUE "BLRS3" 

2 PRINT RT 10,5; 


3 PRINT RT 17,4;"PRESS RNY KE 
Y TO STRRT" 

4 IF INKEY*="" THEN GOTO 4 

5 CLS 
1© RRND 

2© LET R=© 

3© LET P=© 

4© LET R=R+1 


Many BASICS give useful ON... 
GOTO...statements which, unfortu¬ 
nately, ZX/TS BASIC lacks. 

Let's tell our computer ON A 
GOTO 125, 385, 720. It goes to 720 
if A=3. The computer goes to the 
line which lies Ath in the list. 

One way to mimic this command 
is to substitute IF A=1 THEN GOTO 
125, IF A=2 THEN GOTO 385 and so 


5 








on. These multiple IF statements 
eat memory, but replacing ON A GOTO 
with GOTO G(A) can work. 

DIMension numeric array G with 
as many elements as line numbers in 
the ON...GOTO list; assign each 
element in G with a line number. 

Our example uses LET G(l)=125, 

LET G(2)=385 , LET G(3)=720. Do 
this in immediate mode (with no 
line number) to save memory, then 
remember to use GOTO 1 instead of 
RUN to avoid erasing G. 

Robert Nee, Maplewood, NJ 

WHEN YOU FORGET SYNTACTIC SUM—8K 

If you have just entered a pro¬ 
gram from SYNTAX or SQ and want to 
check Syntactic Sum but neglected 
to load the program, add the fol¬ 
lowing program and RUN 9600. You 
can use either FAST or SLOW mode, 
but SLOW takes some time. To check 
that you have entered it correctly, 
enter Syntactic Sum by itself and 
RUN. "S" equals zero. 

Lloyd Painter, Quakertown, PA 

9600 LET 5=0 

9601 FOR R=16509 TO PEEK 16396+2 

56+PEEK 16397-1 

9602 LET 5=5+PEEK R 

96©3 NEXT R 

9604- PRINT **S = '*; 5-7323 

SYNTRCTIC SUM: 7323, 6K ROM 

CONCATENATING MACHINE CODE—8K/IK 

When you want to use two or 
more machine language routines 
in one program, there's no need to 
load them separately. Since each 
machine language routine is com¬ 
plete within itself, it can be 
placed one after another in one 
routine and individually called by 
referring to their beginning ad¬ 
dresses. Converting machine code 
to hexadecimal and writing the 
resulting hex in a REM line makes 
concatenation easy. The example 
program contains the hex repre¬ 
sentation of the Syntactic Sum 


program (Jun.81) and the Renumber 
routine (Jun.82). 

Before you typing or loading 
(regardless of attached memory), 

POKE 16388, 198 

POKE 16389, PEEK 16389-1 and NEW 

to reserve memory for ML routines. 

Type SAVE, RUN and write down 
the displayed values. The first 
value shown is the beginning ad¬ 
dress of the first routine (Syntac¬ 
tic Sum). PRINT USR that value to 
get Syntactic Sum. The second 
value represents Renumber's start¬ 
ing address. RAND USR that value 
to renumber. 

Renumber makes the first line 
of the program 10 and increments by 
10. It does not renumber GOTO and 
GOSUB destinations. You must edit 
them individually. 

In line 4, 16628 was calculated 
by adding 2 less than the number of 
characters in REM line (114) to the 
address 16514 (16514 is the address 
of the first byte of machine code 
in line 10). In line 5, 16576 is 
the number of characters in the 
first routine (62) added to 16514 
and marks the beginning of the 
second routine. Number 198 in the 
above POKE is 256 less half the 
total number of characters, 58. 

Line 2 gets the beginning 
address of the first routine and 
line 5 gets the second routine. 

Line 6 PEEKS hex from the REM line, 
and converts it to decimal, then 
POKES it to reserved memory. 

Rolf L. Miller, Ventura, CA 


1 REM 217D4.0ED5B0C4-0DD2100007 
CBR20087DEB2004.DDE5C1C94.E8600DO0 
92318EC217D40110ft00722373234E234 
623097ED676C80a0R00£B09EBi8EB 

2 LET R=PEEK 163S8+PEEK 16389 
+256 

3 PRINT R 

4- FOR X = 16514- TO 16626 STEP 2 

5 IF X=16576 THEN PRINT R 

6 POKE R, (PEEK X-23> +16+PEEK 
<X+1)-26 

7 LET R=R+1 

6 NEXT X __ 

SYNTRCTIC SUM: 14-&84-, SK ROM 


6 






giimgMB s ®f m m m 




ST HUI 




lhT€RCOMPUT€R INC 

HARDWARE AND SOFTWARE PACKAGES 


MAKE THE MOST OF YOUR TIMEX SINCLAIR 1000 


MEMOTECH PERIPHERALS 

MEMORY EXPANSIONS 

• 16K RAM # PL7002 $ 59.95 

• 32K RAM # PL7003 $109.95 

• 64K RAM # PL7004 $179.95 

• HIGH RESOLUTION GRAPHICS (16K RAM) 

# PL7007 $144.95 

• PLUG-IN KEY BOARD # PL7011 $99.95 

• CENTRONICS PARALLEL INTERFACE # PL7005 
$104.95 

• MEMOTECH RS232 INTERFACE # PL7006 
$139.95 

PRINTERS 

• SEIKOSHA GP-100A PRINTER The revolutionary low- 
cost dot matrix impact printer—Uses up to 9.5” paper 

# PL7008 $349.00 

• SEIKOSHA GP-250X PRINTER The most intelligent 
programmable graphic printer—Uses up to 9.5” paper 

# PL7009 $449.00 

• PRINTER-INTERFACE CABLE #PL7010 $19.95 

• MEMOCALC Software on plug-in EPROM cartridge— 
Spread sheet analysis—Up to 7000 numbers (when 
used with 64K) # BS200C $59.95 


HOME MANAGEMENT 

• BILL ORGANIZER Keeps track of bills, amounts due, 
date due, finance charges, payments made, etc. Sum¬ 
marizes all data for tax purposes. # HM5001 
$14.95 

• CHECK BOOK Balances and maintains your 
checkbook. Finds all checks written to one payee easily. 
Add a printer and it will even write checks for you. 

# HM5002 $14.95 

• ADDRESS BOOK Store, update and retrieve names, 
addresses, and phone numbers. With a printer attached, 
it will print mailing labels, sorts entries alphabetically 
by name, or by Zip Code. Only remember part of a 
name? It will find records from incomplete informa¬ 
tion. Code the entries for special purposes, i.e. 
Christmas Cards, Party Invitations, etc. # HM5003 
$14.95 

• OCCASION CALENDAR Keep track of birthdays, an¬ 
niversaries, meetings and special events. Have your 
calendar appear on the screen at the touch of a key. 

# HM5004 $14.95 

All programs use 16K RAM. 

ENTERTAINMENT 


QSAVE A Hardware-Software Combination— 
Allows a baud rate of 4000 to be achieved com¬ 
pared with only 250 on the normal SINCLAIR 
ZX81—Loads and saves a full 16K in only 29 
seconds—Works with 16K and 64K. # PL7001 




Dealers and Distributors Inquiries Welcome 


I-1 

| Mail to: Intercomputer, Inc., P.O. Box 90, Prudential Center, | 

| Boston, MA 02199 | 

PART # QTY. UNIT U.S. $ TOTAL 


PART # QTY. UNIT U.S. $ TOTAL 


























Shipping and Handling 

Printer 

9.95 


Shipping and Handling 

Memotech Products and QSAVE 

4.95 


Mass. Residents Tax 

5% 

Total 



□ Check □ Mastercard □ Visa 


Account No_Exp_ 

Name 

Address 

City State Zip 


EDUCATIONAL ADVENTURE 
SERIES 

• EDUVENTURE I Answer the questions encountered 
in each classroom until you make it outside for RECESS 
and the surprise that awaits you there. (Grade level K-3) 

# ED3001 $12.95 

• EDUVENTURE II Each new situation requires either 
your ingenuity or knowledge (or both) to avoid being 
sent to the principal’s office. (Grade level 4-6) 

# ED3002 $12.95 

• EDUVENTURE III Solve complex puzzles to outwit 
your teacher and achieve the highest scores. (Grade 
level 7-9) # ED3003 $12.95 

• EDUVENTURE IV An agile mind and quick reflexes 
will get you through this maze of mysterious situations- 
to your DIPLOMA. (Grade level 10-12) # ED3004 
$12.95 

All programs use 16K RAM. 


NEW products coming soon: Software on ROM/EPROM 
CARTRIDGES—SOFTBOXtm . A software library which 
can contain several ROM/EPROM programs. Plug in your 
computer and instantly call any program from your 
SOFTBOX — A full line of software and peripherals 
for the "colorful ZX SPECTRUM/TIMEX 
SINCLAIR 2000. 


For more information, Free Brochure, and 
Special Package Discount, write or call: 

IC INTERCOMPUTER INC. 

P.O. Box 90, Prudential Center 
Boston, MA 02199 Tel: (617)437-1190 
Telex: 951141 COFAR 


•MISSILE LAUNCHER Challenge the enemy by 
destroying his ammunition stored in different locations. 

# FG1002 $12.95 

• KRAZY KONG A new version of the popular arcade 
game. This program has all the features of the original 
and is every bit as fast. # FG1013 $12.95 

• GHOST HUNT Gobble your way through a maze of 
Ghosts, Power Pills, etc., etc., very fast. # FG1014 
$12.95 

• MAZE DRAG RACE Drive through a giant maze 9 
times the size of the screen, watch out for other cars, 
rocks, oil and ice. A really superb machine code 
game. #FG1015 $12.95 

• DEMOLISHER Design an intelligent strategy to 
demolish a growing wall before it crushes you. 

# FG1005 $12.95 

• MCODER Compiles a BASIC program into machine 
code—Extremely simple to use—Write and debug your 
Basic programs—Enter the MCODER—the Basic pro¬ 
gram will be compiled into machine code as you 
watch. # PT4001 $18.95 

• RETURN FROM SPACE # FG1001 $12.95 
•JEOPARDY # FG1003 $12.95 

• VEGAS # FG1004 $12.95 

• AIR ATTACK # FG1006 $12.95 

• GUARD THE PRESIDENT # FG1007 $12.95 
•SUBMARINE #FG1011 $12.95 

• COMBO PACK I Contains Return From Space and 
Missile Launcher # FG1008 $18.95 

• COMBO PACK II Contains Vegas and Jeopardy 

# FG1009 $18.95 

• COMBO PACK III Contains Demolisher and Air Attack 

# FG1010 $18.95 

• COMBO PACK IV Contains Guard The President and 
Submarine # FG1012 $18.95 

All programs use 16K RAM. 

Limited warranty—Defective Software will be replaced if returned within 
30 days.—Memotech Products: 180 days—Seikosha Printer: 90 days 









SOFTWARE REVIEW 


Program: Reversi 

Price: $19.95 plus $2.50 

ROM/RAM required: 8K/16K 
Printed listings? No 
Program listable? Yes 
Challenge: Fair 

Good 

Peter Ulrich 
Zeta Software 
POB 3522 
Greenville, SC 
803/246-1741 


Display: 
Written by: 
From: 


(P&H) 


29608 


Zeta's Reversi offers many im¬ 
pressive features. Machine code 
makes it quick and responsive. You 
choose among three modes of play 
and ten functions. You can play 
against the computer or your ZX/TS 
can play both sides. 

One function calls a list of 
possible moves giving coordinates 
and a rating of + (plus) or - 
(minus) 0 to 9. This list can be 
used by both computer and player 


IT’S HERE!! 

The keyboard you have 
been waiting for! 


A LARGE 60 KEY TACTILE FEEL KEYBOARD 
(MEASURES 10" x 4”) THAT PLUGS INTO THE SAME 
CONNECTORS AS EXISTING KEYBOARD ON YOUR 
ZX81 OR TIMEX SINCLAIR 1000. IT HAS ALL 
SILKSCREENED LEGENDS IN 3 COLORS ON THE 
BASE; MOLDED LEGENDS & GRAPHICS ON KEY TOPS; 
8 AUTOMATIC SHIFT KEYS (NO SHIFTING REQUIRED) 
FOR EDIT, DELETE, SINGLE & DOUBLE QUOTES, 
COLON, SEMI-COLON, FUNCTION & STOP; 5" SPACE 
BAR; 2 SHIFT KEYS; NUMERIC KEY PAD. 


ONLY $84.95 


MASS. RESIDENTS ADD 5% SALES TAX 
SHIPPING & HANDLING $4.00/UNIT 

DELIVERY 4 - 6 WEEKS. QUANTITY DISCOUNTS. WE 
WILL ACCEPT MC/VISA. PLEASE INCLUDE #’S, EXP. 
DATE AND SIGNATURE. FOR MORE INFORMATION 
SEND SASE. SEND INQUIRIES, CHECK OR MONEY 

order TO: E-Z KEY SUITE 75B 

711 SOUTHERN ARTERY 
QUINCY, MA 02169 
617/773-1187 


and lets you see how your ZX/TS 
decides what move to make. This 
function takes from 6 to 40 seconds 
depending on the number of possible 
moves and your choice of FAST or 
SLOW. There are ten levels of play 
but the response time is about the 
same for each? 3 seconds in FAST 
mode and 12 seconds in SLOW mode. 

Entire game listings of com¬ 
pleted moves may be called up on 
screen at any time. Or if you are 
unable to complete a game you can 
save your game that's in progress 
for later play. 

It says in the catalog you can 
take back moves but, I found this 
somewhat misleading. With each 
move, your choice appears on the 
display board with an option to 
enter or delete your choice. You 
also can alter your position by 
entering coordinate and color one 
disk at a time. This can be tedi¬ 
ous if you want to enter a middle 
or end game position. 

If you were a U.S. Othello 
Association member you might be 
disappointed in Reversi. Starting 
disk placement is off by a 90 de¬ 
gree rotation. Also its style of 
play seems to have been taken from 
refuted strategies of Hasegawa's 
book How to Win at Othello . Your 
ZX/TS computer takes an opportunity 
to take the lead as soon as possi¬ 
ble and flips way too many disks 
for opening and midgame play. 

Playing Zeta's Reversi against 
Fidelity's Reversi gave interesting 
results. With Zeta's Reversi at 
its highest level in all games it 
lost as black and white against 
Fidelity's Reversi at its lowest 
level. But with Fidelity's Reversi 
at level 10 (of 18 levels) Zeta's 
Reversi did much better losing as 
black 31-33 and winning with white 
by a wipeout at move 30. 

For those players who have not 
studied or played Othello exten¬ 
sively, Zeta's Reversi provides 
sufficient challenge. 


8 


David Ratliff, Magee, MS 




Games that chalknge you at a price that won't 



S! 


YOU ZX-81 


01 E2-E4- E7-E5 

02 B1-C3 B8-CB 

03 F1-C4 D8-G5 

04- B 1 —R3 

INURLID MOUE 
04- D1-F3 G8-F6 

05 F3-D3 G5-G2 

06 C3-R4- G2-H1 

07 G1-F3 

INURLID MOUE 
07 H2-H4- Hl-Gl 

CHECK 

08 


'OUR MOUE WITH THE 6| 


BACKGAMMON 


FLIGHT SIMULATOR 





1 

. 


si: 

EMum feet 
a EETO KNOTS oil 

• + 
i T 

8CN R - 

BRG D5T 

IPBEEF! F|- 

GESR HQ p|l 



MIXED GAME BAG 


CUBE GAME 


Look to Sinclair for the only $79.95 
computer and the first Serious Games Package. 

A special limited time offer. Call toll free today. 

What could be more challenging than creating 
your own games on a personal computer? Or being 
intellectually challenged by serious games where 
you match wits with a computer or another 
opponent in a fierce trial of skills? 

The Timex/Sinclair 1000* is a fully program¬ 
mable computer with a powerful BASIC language 
and complete instruction manual, all for only 
$79.95. The moment you sit down with the 
TS1000 you can learn how to program your own 
games. Maybe you want to create a stock market 
game, a word game, a mathematical game. 

The challenges are endless. 

For this one low price, the TS1000 comes with 
everything you need for connecting the computer 
to your color or black-and-white TV. 

Of course, you might also want pre-programmed 
software cassettes for your $79.95 computer. 

You’ll have a wide choice with our free software 
catalog which comes with the TS1000. And the 
software cassettes play in any cassette recorder. 

The 16K Memory Module. More power to you. 

Let’s say you want to go one step further. The 
16K Memory Module allows you and your family 
to be challenged by even more sophisticated 
games. Not mindless arcade games, but serious, 
intellectually stimulating games which are both 
fun and educational. 

The Memory Module costs only $49.95 and 
plugs onto the back of the TS1000 for 8 times 
more memory capacity. A whole new world of 
software is available to those with the 16K 
Memory Module. 

The Serious Games Package. 
_ A $75 value for only $50. _ 

For those who want a lot of serious 16K games, 
Sinclair announces a special software offering 
with a $25 savings! Now, for the first time, you 
can receive all five games shown above at the 
reduced price of only $50. 


Chess: You can play with another opponent or 
you can match wits with the computer. 

Flight Simulator: Maneuver and land a light 
aircraft with full cockpit controls, instrumenta¬ 
tion and navigational aids. You have to allow for 
wind velocity and direction, rate of descent and 
mountainous terrain. 

Cube Game: Every bit as mind-baffling as 
Rubik’s Cube. 

Backgammon: Everyone’s favorite. Again, you 
can play against another opponent or against the 
computer. Complete with a doubling cube. 

Mixed Game Bag: A series of memory and con¬ 
centration tests including Robot Wars, a version 
of “Master Mind’.’ 

There’s never been a better value on a serious 
games package. And to think it all starts on a 
$79.95 computer! 

_ Why order today? _ 

In addition to saving $25 on software, there are 
other reasons to buy your TS1000 today. Com¬ 
puters costing hundreds and even thousands of 
dollars rarely offer you games this serious or 
challenging. 

Another reason to order today is convenience, 
by toll-free phone. No crowds, no waiting lines, 
no parking worries. It’s never been easier to get 
started in the world of computers. Or more 
worthwhile. 

How to order today! 

Just call our toll-free number and use your 
MasterCard or VISA. Or send the coupon with a 
check or money order. Then try out the Timex/ 
Sinclair 1000 for 10 days at no risk. If you’re not 
entirely satisfied, we will refund your money. It’s 
as easy as that. (Sorry, no refunds on software.) 

Call toll-free: 800-543-3000. Ask for operator 
509. In Ohio call: 800-582-1364. Ask for operator 
509. In Canada call 513-729-4300, operator 509. 
Have your MasterCard or VISA ready when 
calling. Phones open 24 hours a day, 7 days a 
week. These numbers are for orders only. 


If you simply want information, please don’t 
call, write Sinclair Research, Ltd., 2 Sinclair 
Plaza, Nashua, NH 03061. 

Call toll free 800-543-3000 

-(operator 509)- 

Rd code: Mail to: Sinclair Research, Ltd. 
j B2SX One Sinclair Plaza, Nashua, NH 030611 

| □ Check or Money Order enclosed 



Price** 

Qty 

Amount | 

TS1000 

$79.95 



16K Memory Module 

$49.95 



16K Cassettes 

$15.00 

each 



Special Serious 
Games Package 
(5 games valued 
at $75.00) 

$50.00 



1 Shipping/Handling 

$ 5.00 


$ 5.00 | 


**U.S. Dollars Total: |_ 

Cassettes for 16K Memory Module: ,$15.00 each. 
Check the boxes of all the cassettes you want. 


□ Flight Simulator #6 □ Mixdd Game Bag #26 

□ Chess #7 □ Ill take all 5 cassettes 

□ Backgammon #8 included in Sinclair’s 



Name 


Street 


City 


State Zip 

* Sinclair technology is the heart of both the ZX81 and the 
Timex/Sinclair 1000 computer. 


Sinclair - 









































DEAR EDITOR 


I noticed several letters 
indicating dissatifaction using 
a flat ribbon cable to add an 
external keyboard. 

As an alternative, use number 
28 or 30 wire-wrap wire. It posi¬ 
tions nicely between components and 
exits at most any location between 
case halves. 

Paul Hise, Jeffersonville, IN 


If you hook your ZX/TS to an 
on-line system or service such as 
CompuServe, do you still have your 
cursor system available? Will the 
first key you press be the command 
word above it? 

Christopher Fickett, Burlington, MA 

When you add a modem to your compu¬ 
ter, you use it with a program that 
defines the behavior of your compu¬ 
ter. You can compare your ZX/TS 
plus modem plus software to a game 
program—while you use the game, 
the program controls the behavior 
of the keyboard and screen. Thus, 
availability and utility of the 
ZX/TS cursor system depends on the 
software you use. Generally com¬ 
mand words will not be the first 
response, nor would that be useful 
since other systems would not read 
the byte sent as a keyword.—KO 


In the event anyone wants to 
connect a video monitor to the 
ZX/TS, the procedure is: 

1) Open the case and expose the 
side of the board with ICs and RF 
modulator. 

2) Open lid of the RF modulator. 

3) Remove all connections from 
output of the modulator. 

4) Leave the three connections 
removed, tied together. 

5) Solder plastic coated copper 
wire (solid) to center pin of 
output on the modulator (where the 
three connections used to be). 

6) Solder the other end of the 


bare wire input to modulator (wire 
closest to board edge). 

7) Replace lid on the modulator 
and close case. 

This procedure is quick and 
easy. The video monitor must be 
set on "Hi-Z" only. The picture 
is clear, sharp and stable. 

Gerry Rolle, San Jose, CA 


When I read the premier issue 
of SQ, I was upset by the hardware 
review of Touch-A-Matic keyboard 
overlay. I use my ZX81 every night 
for my users group, and find it 
hard to type on a regular keyboard. 
When I saw Kopak Creations' ad in 
SYNTAX, I ordered it. Two days 
later I received my Touch-A-Matic 
in a neat envelope with directions. 

What a difference Touch-A-Matic 
made on my ZX81. I've encouraged 
group members to purchase Touch-A- 
Matic, and I'm happy to say we're 
pleased with this fine product. 

Michael Wilson, ZX Users of 
America, New York 


When loading a program from 
tape is complete, my computer bombs 
out. I played around with my tape 
and found a recording flaw. Is 
there some way of entering a fake 
END statement so the ZX/TS thinks 
that it has the whole program? 

I have a long program that I 
don't want to retype. The computer 
takes 90% of it before it bombs 
out. Would it work if I hit break 
before the flaw and enter END? I 
don't know machine code well enough 
to try it. 

John Broussard, Tucson, AZ 

I don't know how to enter an END 
statement to solve this problem. 
But, with a ZX-99 Tape Controller 
(Sept.82) you could read material 
in, edit it, re-record it and load 
the edited version. Check with the 
Phoenix user's group, 602/846-2882; 
Randy Saxton.—KO 




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teSSS*** 








BEHIND EVERY 
GOOD SINCLAIR 
IS A MEMOPAK 


If you own a Timex-Sinclair 1000 or 
ZX81 computer, you should have a 
Memopak behind it. From increased 
memory to high resolution graphics, 
Memotech has a Memopak to boost your 
system’s capabilities. Every Memopak 
peripheral comes in a black anodised 
aluminum case and is designed to fit 
together in “piggy back” fashion to enable 
you to continue to add on and still keep an 
integrated system look. 



High Resolution Graphics 


Order at no risk 

All Memotech products carry our 10 
day money back guarantee. If you’re not 
completely satisfied, return it in ten days 
and we will give you a full refund. 

And every Memotech product comes with a 
six month warranty. Should anything be 
defective with your Memopak, return it to 
us and we will repair or replace it free of 
charge. Dealer inquiries welcome. Tb order 
any Memotech product call our toll-free 
number 800/662-0949 or use the order 
coupon. 


snmo Teen 

CORPORATION 

7550 West Yale Avenue 
Denver, Colorado 80227 
(303) 986-1516 
TWX 910-320-2917 



1 64K RAM 

117995 



J 32 K RAM 

10995 



1 I6KRAM 

5995 



Centronics Parallel Printer Interface 

104.95 



1 RS232 Printer Interface 

13995 



* High Resolution Graphics 

144.95 



I Shipping and handling 

4.95 


*4 95 1 

, * All prices quoted in U S dollars 


Tkx** 


. ** Colorado residents please add sales tax 

J □ Check □MasterCard □ Visa 


fetal 


' Account No 


Exo. _ 


1 I 

l 1 

! Name 

1 

I Addrot 1 

! i 

'City 

l___ __ 


State 

Zip 1 


Memopak 64K RAM The 64K RAM extends the 
memory of your Sinclair by 56K to a full 64K. It 
is directly addressable, user transparent, is 
neither switched nor paged and accepts such 
basic command as 10 DIM A (9000). The 
Memopak 64K turns your Sinclair into a 
powerful computer suitable for business, 
recreational and educational use. No additional 
power supply is required. 

Memopak 32K RAM The 32K RAM Memopak 
offers your Sinclair a full 32K of directly 
addressable RAM. Like the 64K Memopak, it is 
neither switched nor paged and enables you to 
execute sophisticated programs and store large 
data bases. It is also roily compatible with 
Sinclair’s or Memotech’s 16K RAM to give you a 
full 48K of RAM. 

Memopak 16K RAM The Memopak 16K RAM 
provides an economical way to increase the 
capabilities of your Sinclair. And at the same 
time, it enables you to continue to add on other 
features with its "piggy back” connectors. It is 
compatible with the Sinclair 16K or a second 
Memopak 16K or Memopak 32K to give 32K or 
48K of RAM respectively. 

Memopak High Resolution Graphics The 
Memopak HRG contains a 2K EPROM monitor 
and is fully programmable for high resolution 
graphics. The HRG provides for up to 192 by 248 
pixel resolution. 

Memopak Printer Interface The memotech 
centronics parallel or RS232 printer interface 
paks enable your Sinclair to use a wide range of 
compatible printers (major manufacturers’ 
printers available through Memotech at 
significant savings). The resident software in the 
units gives the ASCII set of characters. Both 
Memopak printer interfaces provide lower case 
character capabilities. The RS232 Interface is 
also compatible with modems. 

New products coming soon Memotech will 
soon be introducing four new Sinclair 
compatible products: a high quality, direct 
connection keyboard, a digitizing tablet, a 16K 
EPROM and a disk drive. Watch for our future 
advertisements. 



r 

i 

it 


& 

i 


j 

i 


i 

i 











MEMOTECH INTRODUCES THE ZX81/TS-1000 KEYBOARD 



The Memotech keyboard is a high quality standard (typewriter) keyboard, with Sinclair 
legends. The keyboard is housed in a well engineered and elegant aluminium enclosure. 
It is cable connected to the accompanying buffered interface which is housed in a 
Memopak case and plugs directly onto the 
back of the computer. As with other 
Memotech products, the piggy-back tradi¬ 
tion is maintained, allowing other add-ons 
to be plugged onto the back of the interface. 

Priced at $99.95 (Plus $4.95 for shipping and 
handling). 


THE FOLLOWING PRINTERS ARE ALSO AVAILABLE THROUGH MEMOTECH 


SEIKOSHA GP 100 

The Seikosha GP 100 uses a 5x7 dot matrix printing format with ASCII standard upper 
and lower case character set. Printing speed is 30 characters/second with a maximum 
width of 80 characters. Character spacing is 10 characters/inch with line spacing of 
6 lines/inch or 9 lines/inch. The printer uses standard fanfold paper up to 9i inches 
wide. The GP 100 utilizes a standard parallel interface (Centronics compatible). 

Priced at $399JOO including Centronics parallel interface & cable. (Plus $9.95 for 
shipping and handling). 


SEIKOSHA GP 250 


The GP 250 is also manufactured by Seikosha, the leading company of the Seiko group 
It uses a 5x8 dot matrix printing format with ASCII standard upper and lower case 
character set. Printing speed is 50 characters/second with a maximum width of 80 
characters. Character spacing is 10 characters/inch. The GP 250 also uses paper up 
to 9£ inches wide. This printer utilizes either standard parallel Centronics interface 
or serial (RS232, DIN connector) interface. 

Priced at $449jOO including Centronics parallel interface & cable. (Plus $9.95 for 
shipping and handling). 

PROWRITER 8510 


The Prowriter 8510 is a Leading Edge product. It uses a 7x9 dot matrix printing format 
with ASCII standard upper and lower case character set. The printing speed on the 8510 
is 120 characters/second with a maximum width of 80 characters. The 8510 utilizes a 
standard Centronics parallel interface. 

Priced at $649.00 including Centronics parallel interface & cable. (Plus $9.95 for 
shipping and handling). 


To order any of the above items, call Toll Free 1 800 662 0949 or write: 

MEMOTECH CORPORATION 

7550 W. Yale Avenue, #200 
Denver, CO 80227 





i 


BOOK REVIEW 


Title: 

Author: 
Publisher: 


Price: 


Mastering Machine Code 
on Your ZX81 
Toni Baker 

Reston Publishing Co. 
c/o Prentice-Hall, Book 
Distribution Center, 
Route 59 at Brook Hill 
Dr., W. Nyack, NY 10995 
$12.95 


Many things bother me about 
Toni Baker's book. But, this book 
is invaluable if you want to expand 
your programming potential and 
stretch your ZX/TS to its limits. 

If you're disenchanted with 
sluggish ZX/TS graphics or limited 
number of BASIC commands, then 
you're ready to move into machine 
language. Baker's book gives you 
an easy intro to machine code and 
focuses on your ZX/TS computer 
rather than the Z80 microprocessor. 

Toni Baker's book is written 
for ZX/TS users who know BASIC but 



A ZX-81 breakthrough! 


The CAI/ESF 
mass storage 
device 

• Load or store 27K 
bytes in less than 30 seconds. 

• Your existing cassette-stored pro¬ 
grams transfer easily. 

• Menu-driven, access by keyboard 
command. 

• Second drive easily added for greater 
flexibility. 

• For T/S 1000, ZX-81 and ZX-80. 

$119.95* 

• Requires CAI/O Board for interface $69.95 

Order by phone or mail. Check, money 
order, VISA or MasterCard (include 
number and exp. date). Post, in U.S. $5 

CAI Instruments 

PO Box 2032, Midland, Ml 48640 

©Copyright 1982 CAI Instruments, Inc. 


517 - 687-7343 


have no background in machine lan¬ 
guage. She begins with an elemen¬ 
tary explanation of hexadecimal 
math and ends by disassembling the 
ZX81 ROM. She occasionally pauses 
to patiently explain instructions 
and routines. She also illustrates 
more difficult concepts by using 
them in such programs as Life, 
Spirals and Draughts. Baker also 
includes a program that lets your 
ZX/TS generate two whole octaves of 
musical notes. In my opinion, this 
program alone makes Mastering 
Machine Code worth its price. 

Toni Baker's writing, or more 
correctly, teaching style is infor¬ 
mal, almost chatty. She encourages 
you to experiment and modify pro¬ 
grams to reinforce newly acquired 
skills. Although Baker's Mastering 
Machine Code progresses slowly, it 
encourages you to think through 
each process before going on. The 
end results are faster execution of 
your programs and better use of 
your machine's memory. 

I found several aspects of the 
book disappointing. It wasn't un¬ 
til Chapter 2 that I realized that 
Mastering Machine Code was written 
for both ZX81s and ZX80S. What a 
surprise! No mention is made of 
ZX80S in the title, introduction 
or back cover blurb. Interruptions 
in narrative to explain "old ROM" 
and "new ROM" differences should be 
mentioned earlier on. 

It is painfully obvious that 
Mastering Machine Code is some 
kind of photo reproduction of typed 
manuscript pages. For the $12.95 
price I feel entitled to a properly 
proofread, typeset book. I also 
found local British idioms to be 
disconcerting—and in places they 
obscure Baker's meaning. 

Mastering Machine Code covers 
a difficult subject, but if you de¬ 
vote some time to your ZX/TS com¬ 
puter and Toni Baker's book you'll 
end up speaking a language other 
than BASIC. 

John Connell Jr., Middletown, RI 




i 




I 


I 

# 



i 


14 


i 


M Touch - A - Mat ic ”, Power 
At Your Finger Tips! 



KOPAK'S TOUCH-A-MATIC™ gives you the power to type more accurately 
and much faster. It requires no wires, no soldering. Comes with complete 
instructions. It's as easy as removing adhesive backing and pressing into 
position. Positioning is easy. Once in position, you are ready for touch¬ 
typing with ease. 

Our unique vinyl-key-hold creation will guide your fingers to the correct 
keys. Finally, touch-typing now possible with your Sinclair* or Micro-Ace*. 

This remarkable product, as well as other KOPAK items, are now available. 
Call now to order through MC/Visa or send check/M.0. to Kopak Creations, 
Inc. 

TM Trademark of KOPAK Creations, Inc. 

Sinclair* is a trademark of Sinclair* Research LTD. 

MicroAce* is a trademark of MicroAce* 


$1.50 Handling Charge 


KOPAK CREATIONS, INC. 
(212) 757-8698 

Master Charge & Visa Accepted 


KOPAK Creations, Inc. Dept.SXI P.O. Box 1076, New York, NY 10019 (212)757-8698 




HARDWARE TIP—KEYBOARD CONVERSION 


If you plan to try the keyboard 
conversion shown in SQ (premier 
issue. Winter 82), try using a 16- 
pin DIP socket (wire wrap), cut in 
half for plugging your keyboard 
cable into your ZX board. Use this 
simple plug as a connector to any 
keyboard or joystick. (For a photo 
of the board, see SQ Winter or the 
chapter entitled "How the Computer 
Works" in the ZX/TS manuals.) 

You don't need to remove 5- 
and 8-pin connectors shown in fig¬ 
ure 3 (SQ Winter 82, p.28). After 
going to the trouble of saving the 
double-sided tape when you opened 
your case, it seems silly to void 
your warranty and physically modify 
your ZX/TS when you can use a $.50 
part for a connector. 

Original keyboard connector 
sockets have pins on 0.010" cen¬ 
ters. This is standard DIP (dual 
in-line pin) socket spacing. Get 
a 16-pin DIP socket (preferably 


wire-wrap type) and cut connecting 
bridges to create two 8-pin single- 
in-line packages (SIP). Strip the 
5- and 8-wire cables from your new 
keyboard and plug them into appro¬ 
priate pin holes on each SIP (dis¬ 
regard or remove the extra three 
slots on one SIP), then solder in 
place. Cut the long wire-wrap pins 
off to about 1/4" and insert in 
ZX/TS sockets. 

Paul Donnelly III, Centerport, NY 



Discard 



MELBOURNE HOUSE SOFTWARE 


"THIS BOOK SHOWS JUST HOW 
MUCH CAN BE CRAMMED 
INTO SINCLAIR/TIMEX'S 
TINY RAM CHIPS!" & 


Orders to: MELBOURNE HOUSE SOFTWARE 

Dept. CS 347 Reedwood Drive, Nashville, TN 37217 

Dealer orders and queries: 800/251-5900 
(ask for a Melbourne House operator) 

Visa and M/C orders 

can be phoned in. 615/361-3738 


BOOKS: 

□ 25895 The Complete Basic Course $34.50 

□ 25957 Machine Language Programming 

Made Simple $14.95 

□ 20922 The Complete Tlmex/Sinclalr 

ROM Disassembly $19.95 

□ 26025 Not Only 30 Programs $9.95 

□ 25913 Understanding Your 2X81 ROM $14.95 

TAPES: 

13941 Gamestapel:llPrograms-lK $14.95 

13942 Gamestape2:3Games-l6K $14.95 


13943 Gamestape 3: Catacombs 

Adventure-16K $14.95 

13944 Gamestape 4:3D Monster Maze-16K $14.95 

13945 Gamestape 5:3D Orbiter-16K $14.95 

26446 Space Trek-16K $14.95 

26359 Super invasion-IK $14.95 

26318 wail Busters-lk $14.95 

26472 10 Exciting Programs-lK i $14.95 
26284 Reversi-IK $14.95 

1 26406 Toolbox-IK $14.95 

] 26490 Basic Course 2 cassette pack $7.50 

] 14026 Combat Flight-16K $14.95 


TOTAL: $_ 

Residents of CA,MD,TN, 

please add sales taxes: _ 

Add $2 for Shipping & Handling, 

foreign orders add $6: _ 


Enclosed is my check or money order for $ 


TOTAL: $_ 


Please charge my Visa or r MasterCard Card#_ expiration date 

Signature_Name_ 


STX2 


Address 


City 


SINCLAIR 


ZX81 



















HARDWARE REVIEW 

Product: JK Audio Model JK-310 
I/O Board with Real 
Time Clock 

From: JK Audio, P.0. Box 3295, 
Escondido, CA 92050-0580 
Price: $59.95 (assembled and 

tested) plus $3.95 (P&H) 

JK-310 is ideal for your appli¬ 
cations and projects that require a 
real-time clock. 

JK-310 uses an OKI semiconduc¬ 
tor MSM5832 real-time clock chip. 

It runs independently of your 
computer and is addressed directly 
from software when needed. Battery 
backup is provided for, so you just 
program the day, date and time once 
and forget it. 

JK-310 is an impressive piece 
of hardware. It has its own 5-volt 
regulator and an interesting multi¬ 
plexing scheme. It runs four memo¬ 
ry locations into both the clock 
read and write ports and up to 
eight 8-bit inputs or outputs. It 
comes set-up with edge connector 
access to control port for further 
multiplexing, clock, one buffered 
8-bit input port, a buffered 8-bit 
output port, and direct access to 
the data bus. JK-310's standard ZX 
bus connector is compatible with 
RAM packs, etc. The package uses 
four memory locations, 16380-3. 

MSM5832, running with a 32 
kHz clock, keeps automatic track of 
seconds, minutes, hours, day and 
date, month, year and even leap 
year. It is accessed by a POKE 
which tells the hardware which 
digit you want to know and a PEEK 
which looks at the digit. JK 
provides BASIC software (using 2K 
RAM or less) to get time data and 
then print it out. 

Both clock and I/O ports use 
74LS374 & 74LS139 logic chips to 
decode 4 memory locations into 
various port configurations and 
simulate more expensive peripheral 
I/F adapter chips. This decoding 
scheme brings 6 more I/O control 


lines to the 44-pin edge connector. 

On the negative side, output 
ports can only sink about 40 mA, 
which isn't enough for common 5V 
relays. This means another power 
supply would be required. For 
example, if you have another trans¬ 
former, a 24 volt relay would be 
sufficient for 40Ma. (JK Audio 
says Radio Shacks DPDT with 12VDC 
coil, #273-213, works fine.—Ed) 
JK-310 is professionally de¬ 
signed mechanically and electri¬ 
cally. Complete schematic and data 
on the OKI time chip is provided. 
Documentation, however, is sparse 
and hard to follow. You'll also 
need 3 NiCad AA batteries. Check 
the supplied battery holder polar¬ 
ity; mine was backwards. 

JK-310 is a powerful ZX/TS 
addition. With simple interface 
circuits (schematics provided), you 
can use it for many applications 
where exact time is important. 

Paul Donnelly III, Cente rport, NY 

Sinrlair 

Computing 

Not just another newsletter, Sinclair Computing is a 
typeset magazine with color illustrations, published 
monthly. If you own a Sinclair or Timex/Sinclair 
Computer you need Sinclair Computing. Every issue is 
packed with informative Articles, New Products, Users 
Groups, News Bits, Letters, Ask Sinclair Corp., Reviews, 
Tutorials, Hardware Projects (many for under $10), 
Programs, and Games. 

FOR JUST $2.95 PER ISSUE 

YOU CAN MAKE THE MOST OF YOUR 
SINCLAIR or TIMEX/SINCLAIR COMPUTER. 


If after your first Issue you are 
not fully satisfied...cancel your 
subscription for a FULL, refund. 


Sinrlair 

Lomi 


omputing 


BOX 95-SC 

Gtenmont New York 12077 


Sinrlair 


Ccmiputing 


□ I want one year for just 836. 

□ I want two years for just 865 
Enclosed Is my check or money order 


cmr_ 

STATE _ 

SXT-2 


17 








CHANGE YOUR 

TIMEX/SINCLAIR 1000 DISPLAY 
TO FULL COLOUR GRAPHICS 

with 

KOLORWORKS 

LOOK AT THE FEATURES ! ! ! 

* Plugs into ZX81/1000 (edge connector) 

* All text will run on the color tv 

* Module contains it's own memory 

* User defined characters & graphics up to 

256x192 pixels 

* Latest technology with TMS9918 VDP 

(32 sprite levels) 

* Module contains extension of basic commands 

including: PAPER/INK/BORDER/BIN/ 
SPRITE/OUT/INP / etc. 

for $149.95 

Use your KOLORWORKS immediately with a 
game cassette for $9.95 

This delightful game is designed for hours of fun using some 
of the color graphic capabilities of KOLORWORKS. The 
cassette also contains a short program to familiarize you 
with some of the commands and graphics. 


MOD TO USE HUNTER RAM WITH > 32K 

Hunter tells us that their 
nonvolatile RAM board (reviewed in 
SQ, Winter 82) requires modifica¬ 
tion to work in systems with more 
than 32K conventional RAM. 

Remove 74LS139 (IC5), bend pin 
1 up and over pin 2 without con¬ 
tact. Buy a 74LS32 (available from 
Radio Shack), bend pins 1 and 2 
directly out, pin 3 out and under 
pin 2, pins 7 and 14 sideways, and 
cut off pins 4-6 and 8-13. Mount 
the 74LS32 on top of the 74LS139 
with pin 1 above pin 1 and solder: 


7.4,L.sm 


74LS32 

pin 16 

to 

pin 14 

pin 8 

to 

pin 7 

pin 1 

to 

pin 3 

Solder 1" insulated 

flying leads to 

pins 1 and 2 

of the 

74LS32. 

Reinsert 

the two ICs into the 


socket for IC5. Sold er o ne lead to 
A15 and the other to MREQ on the 
edge connector. This completes 
decoding on the Hunter RAM board. 

BOOK REVIEW 


MAIL TO: 

BRAINCHILD COMPUTER WORKS, INC. 

P.O. Box 506 
Pewaukee, Wl 53072 


Price + Qty._Amount 


KOLORWORKS 

$149.95 



CASSETTE 

9.95 



Shipping and Handling 

4.95 


$4.95 

Wi. Res. add Sales Tax 




My Dcheck D money order enclosed 

TOTAL 



Name 


Street 

City State Zip 

Please allow six to eight weeks for processing. Thank you. 

For further information - Send $2.00 (credited to order) 
WATCH FOR: 

"GAAMWORKS" - 

Joystick Ports / Sound / Cartridge Slot 


Title: Explosive Games for 

the ZX81 

By: Tim Hartnell 

From: Reston Publishing Co., Inc. 

c/o Prentice-Hall Inc., Book 
Distribution Center, Route 
59 at Brook Hill Dr., W. 
Nyack, NY 10995 
Price: $10.95 

(softcover, 140 pp.) 

Any ZX/TS owner with children 
or a limited budget for commercial 
game software will want a copy of 
this book. Tim Hartnell covers a 
wide range of games providing some¬ 
thing for everyone. 

49 Explosive Games is a dual 
purpose book. The book's program 
listings are also intended to 
broaden your programming skills. 
Hartnell says, "We've tried to en¬ 
sure that each and every program 
contains at least one programming 
technique which you'll adapt for 


18 




your own programs." 

Hartnell lists games of all 
imaginable types: mazes, adven¬ 
tures, racing and landing games, 
and of course alien blast games. 

He includes Life, Draughts (Chec¬ 
kers), and several unique pattern 
generators. In some games you are 
pitted against the logic of your 
computer? in others your foe is the 
insidious random number generator. 

Hartnell's book gives many 
hours of good fun in both playing 
and programming "49 explosive 
games." He is not overly concerned 
with authorship pride. He invites 
you to enjoy "...working with them, 
altering them...deleting some sec¬ 
tions, improving others, and so on, 
until the game carries your person¬ 
al stamp." In many cases he offers 
hints on potential game improve¬ 
ments or ZX81 to ZX80 conversions. 

When you consider the per game 
cost is something less than 25 
cents, you get a real bargain with 
this book. Another bonus: IK and 
16K games come with directions on 
how to play them and programming 
techniques used. ZX80 owners will 
find 28 games for their machine. 

One fault with 49 Explosive 
Games lies in its visual presenta¬ 
tion. About two-thirds of program 
listings are apparently reproduced 
directly from ZX/TS printers. This 
may build confidence that programs 
are correctly listed and really 
run, but it detracts from program 
readability. Fortunately, Hartnell 
foresaw this problem and repeats 
troublesome keystroke patterns. 
Inverse graphic and alphanumeric 
characters suffer the most from 
this treatment. 

I strongly recommend this book 
to any new ZX/TS owner and to users 
who have children beginning to take 
interest in programming. Some ZX81 
veterans will find this book inter¬ 
esting too, but many will have al¬ 
ready progressed beyond the scope 
of 49 Explosive Games. 


CLASSIFIED ADS 


You can reach almost 9,000 ZX80/81 
and TS1000 users for just $9/line 
in SYNTAX classsified ads. Send 
your ad copy, typed 35 char./line 
(exactly as you want it to appear) 
with a check or money order (No 
CREDIT CARDS OR PHONE ORDERS, 
please) to arrive by the 15th of 
any month. Your ad will appear in 
the next month's issue. To repeat 
an ad, send another ad order with 
check by the 15th. We take no 
responsibility for advertisers. 
Include your telephone number, 
whether or not the number appears 
in ad copy. SYNTAX Classified Ads, 
RD 2, Box 457, Harvard, MA 01451. 

From the SYNTAX bookshelf: 

Zilog Z80A CPU Tech Manual, $7.88? 
Assembly Language Programming 
Manual, $15.75? Crash Course in 
Microcomputers, $21.45? ZX80 
Pocketbook w/8K supplement SALE 
$12.45, Expt. in Art. Intelligence, 
$10.45, Back issues SYNTAX $4 each. 
All prices include shipping. 

SYNTAX, RD 2 Box 457, Harvard, MA 
01451. For faster service use your 
credit card 617/456-3661. 

COMPUSETTE is a C-10 cassette which 
is especially designed for micro¬ 
computer application by TAPEMASTERS 
25 for $20.00 100 for $70.00 

COMPUSETTE+ is a C-20 cassette 
25 for $22.00 100 for $77.00 

VISA MASTERCARD C.O.D. 

TX 214-349-0081**OTHER 800-527-1227 

10% Discount for Check with Order 
P. 0. Box 38651*Dallas, Texas 75238 
FREIGHT PREPAID*DEFECTIVES REPLACED 

- STOCK OPTIONS - 

ZX81/TIMEX 16K. Make objective 
strategy decisions. Requires only 
current option data. Program uses 
Black-Scholes model for extensive 
analysis. Ranking by: profit, loss, 
expected return. Up to 9 options/ 
run? easy-to-use? full screen edit. 
Tape,doc: $25 to Air Capitol Soft¬ 
ware, PO Box 12051,Wichita,Ks,67277 


John Connell, Middletown, RI 


19 





SQ SPRING IS HERE! It's the 
magazine for ZX/TS users $15/4 iss. 
From SYNTAX, phone 617/456-3661. 


V 

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ANALOG INTERFACE Read voltge & temp 
High resolution ,00004V or.05 deg C 
Requires no mods.C onnects to tapein 
$39.95/kit:$59.95/asm:$5pp/doc only 
Add$3-US post==>Down East Computers 
POB 3096.Dept F.Greenville,NC 27834 

*********************************** 

* PRICE SLASHED FOR 1983 * 

*CUSTOM ATTACHE CASE formfit for * 
*ZX80/81,TS1000 and hardware * 

*As advertised in SYNTAX QTRLY. * 
*$34.95 plus $3.50 P/H,send CK/MO * 
*info send SASE COMPUTA-DEK 6009 * 

*Kenwood Dr. Nashville, TN. 37215 * 
*********************************** 

"LOADSTAR" -RELIABLE PROGRAM LOADING 
Unit For ZX-80/81/TS-1000 Computers 
$40 (CA+6%) + $4 S+H To Cinevision 
PO Box 546 Montebello CA 90640 Or 
SEND SASE FOR MORE INFORMATION. 

LAND THE SPACE SHUTTLE. (16K) VECtor 
transformations simulate motion in 
3-dimensions & test judgment/skill 
Cassette$6.95 "DO LOOPS" WORKSHOPS 
209 Maple, Harleysville PA 19438 

ZX81/TS1000 SOFTWARE,16K:CHECKBOOK; 
Album;BookInventory;Add&Phone List; 
Bill Organizer:Each$10.95Plus $1.50 
P&H Send CK or MO To:DC ELECTRONICS 
55 M ST NW #306; WASH DC 20001 

* NEW C.R.C. * SMART* *SOFT FACE * 

* INTERFACES PRINTERS TO SINCLAIR * 

* Serial *Parallel* Uses No RAM * 

* No User Routines ** Any Printer * 

* Single Key Operation ** $109.95 * 

* ******* C.R.C. SOFTWARE ******* * 

* 16K PRACTICAL PROGRAMS FOR YOUR * 

* Home And Family And Blank Tapes * 

* Send $1.00 Refundable On First * 

* Order For Catalog From *C.R.C. * 

* 2901 AUBURN-AUBURN HTS. MI.48057* 


STATES & CAPITALS*16K,DRAWS U.S., 
Quizzes State Name & Capital.Tape 
$10 Or For Info,SASE TorKIMTECH 
1608 23RD AVE NE MPLS,MN. 55418 

MAZE MAN -fast MC maze chase S5/ LINE 
RENUMBER(all MC does GOTO&GOSUB) $5 
(SASE for info & free program)BROWN 
SOFTWARE 53 CLIFF LANE LEV.NY 11756 

M £1 T-SHIRTS 7.50 ppd S M L 
Send check or money order to: Pecos 
Star Co., Box 8348, Denton TX 76203 

* C URE THE W OBBLES * 

End RAM Crash, Easy Soldering Req'd 
Fact.Compat. Send $12 RON PATTERSON 
P.O. BOX 12134 ORLANDO FL 32859 

DRIVE A VIDEO MONITOR WITH YOUR 
ZX-81. Our DVC-1 direct video kit 
is only $9.95. With the DVC-2 you 
can switch select normal or REVERSE 
VIDEO ; kit $20.45, fully assembled 
$31.45, installed $44.95, Get super 
sharp character definition with our 
12" B&W video monitor,$98.45.Random 
Access,Box 41770S,Phoenix,AZ 85080 

*********************************** 

AT LAST: REVERSE VIDEO FOR THE ZX81 
WHITE LETTER ON A BLACK BACKGROUND 
FITS INSIDE CASE-ONLY 4 CONNECTIONS 
send check or money order $15. 

SIGHT AND SOUND ELECTRONICS 
1120 Bailey Hill Rd. #10 

Eugene,OR. 97402 
*********************************** 

**FREE GAME PROGRAM! Send Stamped** 
♦Envelope To:ZAMIS ENGINEERING,251* 
**First St.,Perrysburg,Ohio 43551** 

*********** R co TECHNICAL*********** 
Z-WRYTER-Word processor.Write,edit, 
save text using powerful editing 
functions. Supports ZXpr inter .Great 
for notes,reports. $9.95 
DISTACALC -Calculates great circle 
distance and azimuth between any 2 
points on earth using lat/longitude 
File area holds 200 cities.Great 
for hams-remarkably accurate.$11.95 
Tape&manual-16K req.Add $1 postage. 
RCO PO BOX 733D ST ANN MO 63074 
20 



** ADD MEMORY THAT WON'T FORGET 1 ** 

* Now supplied with 6116LP-3 CMOS * 
*Assembled & tested version $46:90* 

* kit $31:90 SASE details: HUNTER * 
*1630 Forest Hills OKEMOS MI 48864* 
****** READ THE REVIEW IN £Q ****** 

SINCLAIR/TIMEX INTERFACING TO 
ANALOG and DIGITAL Devices. J.V. 
Kane And Co. 109 Ardmore Avenue, 
ARDMORE PA 19003. 215-649-1782 

*** THE DEFINITIVE TAX PROGRAM *** 
Fr 16K ZX81/TS1000. EASY DATA ENTRY 
AUTOMATIC TAX COMPUTATION FOR EACH 
CHANGE, INCLUDING INCOME AVERAGING. 
Info:SASE, Cassette:10.95. ** LQP 

2365 Newcastle,Cardiff,Ca,92007 ** 

**ZX81/TS100 0...FINGERS SLIPPING?** 
"ClearTouch" lets you feel your 
keyboard, improves accuracy, speeds 
input. No modificatons reqd. $9.95 
$1.50 shp(Wa. res. 5.9% tax) chk, 
MO, Visa/MC give No. & Exp. date. 
CT, Box 1136, Anacortes, Wa. 98221 

KEYBOARD CONVERSION, thorough instr 
ZX 80/81, T/S 1000. Reset, Edit., 
etc. 10 shift key. $3. No shipping 
charges. VIDEO UPGRADE ± DIRECT 
VIDEO. $1. 16K GOT THE WIGGLES? 

Send $1. IMPROVED HEATSINK $3. 
W rite : Spectra, 2509 N. Campbell, 
Box 295, Tucson, AZ 85719 

* 

* FREE NEWSLETTER 8 page 

****** Send SASE to Friendly, Box 

* 122, Wallingford, PA 19086 

* 

DISCOUNT PRICES: dir.import 16K 
Rampak w/ edge connector 54+2 
postage. Full size keyboard 
houses computer 72+3 MINDWARE 
printer 117 + 4 Q-SAVE 36 +2.full 
size printer 325 + 7 Write for low 
prices on EPSON,OKIDATA,AXIOM prin 
ters. 10-15% discount on all 

software from SOFTSYNC,DATA ASSETTE 
GLADSTONE and others. Ask about 
our disc drives and SPECTRUMS. 

Send payment w/order to SIMPLY 
SINCLAIR POB 480 WDBG,VA 22194 


***** METAGRAPHICS ***** 
USE THE FULL GRAPHICS POTENTIAL OF 
Your ZX81/TS1000 (16K RAM). 2048 
CHARACTERS ! BASIC+M/L GIVES YOU 
TOTAL ARTISTIC CONTROL. SEND $12.95 
******** CALLIOPE SOFTWARE ******** 
4130 COE DR. NE, ALBUQ., NM 87110 

24 ENTERTAINING & USEFUL PROGRAMS 
On Top Quality Tape *REQUIRES 16K* 
Listings Only $8.95 *TAPE $17.95 
GAMES*BUSINESS*HOUSEHOLD*&MUCH MORE 
Send SASE for FREE Detailed info to 
K-TOWN 16K SOFTWARE 
4212 CROSBY DR.,KNOXVILLE,TN. 37919 

WILBUR FROM WOX Cassette & Manual 
Tested educational micro-movies 
Four 16K programs for K-3rd grade 
(Intro-Message-Keyboard-Math) 
$9.95 pp USA. Send check/MO to: 
***** MIDLAND MICRO MAGIC ***** 
RR#2 (291-A) Murphysboro IL 62966 

*** QUALITY/AFFORDABLE SOFTWARE *** 

1. Blackjack & Hi-Lo.$10.95 

2. Mastermind,Supermind&Guess.$10.95 

3. Escape, Snake & The Trap....$8.95 

4.2K Game pack (5 games).$9.95 

5.ZX/TS Quick Reference Card..$2.50 
1,2&3-16K.Games use Video Graphics! 
Cal Res add 6%Tax.CK/MO to COMPUWIZ 
Box 390078, Mountain View, Ca 94039 
Dealer inquiries welcomed. 

MULTI-FUNCTION WINKY BOARD II**New 
SAVE filter cuts rampac "noise" for 
clean easy loading tapes.DUPLICATES 
any ZX/TS cassette. Solves LOAD 
problems AND MORE! Tiny lxl 1/2" 
open board interface needs no pwr 
no mod $24.PPD $18.kit US/Canada 
G.Russell RD1 Box 539 Centre Hall, 
PA 16828 

KEY LOAD CASSETTE short ML program 
SAVEs those unLIST/unSAVEable cas¬ 
settes fr bkup 16K TS/ZX81 $10PPD G 
Russell RD1BX539 CentreHall PA16828 

Z81/TS1000 CANADIAN FEDERAL IN¬ 
COME TAX RETURN. 16K RAM. $9.95+ 
1.50 P and H. JM SOFTWARE, 1852 
Appleford St. Gloucester Ontario 
K1J 6T4. 


21 




*** ZX/TS TOUCH TAB OVERLAY *** 

Feel center of keys for positive 
entry. No visual interference. 
Pressure sensitive attach quick 
& easy. Really works. $5.00 and 
SASE. L-P Overlays, 631 W. Main, 
Madison, In. 47250. 

* CINOUEDEA HAS YOUR ADVENTURE! * 

Castles & Creatures II .$ 9.95 

Titans & Trolls II . 9.95 

Wizards & Warlocks II.9.95 

- New Series Three Software - 

Castles & Creatures III .16.95 

Galactic Gladiator III .16.95 

For 16K ZX81/TS. Cassette with load 
& play instructions. Send check to: 
CINQUEDEA SOFTWARE, 214 INDIAN 
CREEK DR., PEKIN, ILLINOIS 61554 

"UNIVERSAL COIN COLLECTION" Menu 
format: Add/delete,search,check 
inventory,change cost/value,total 
cost/value,auto-run/auto-save and 
more! 8KR0M,16KRAM. Tape + manual 
$10.95 + $1.50 S&H. NJ add 6% tax. 

M.C.HOFFMAN CO., DEPT. SX2, 

P.0. BOX 117, OAKLAND, N.J. 07436 

***for TIMEX/SINCLAIR computers*** 
NEW BOOK :the WATCHMAKERS GUIDEBOOK . 


product directory & more!-3.95 

LOST IN SPACE -11.95 

UNIVERSAL INVENTORY FILE -16.95 

UNIVERSAL MAILING LIST -10.95 

UNIVERSAL COIN COLLECTION -10.95 

UNIVERSAL STAMP COLLECTION -10.95 


UNIVERSAL COMIC BOOK COLLECT — 10.95 
UNIVERSAL BASEBALL CARD COLL —10.95 

UNIVERSAL RECORD ALBUM COLL -10.95 

Each program on cassette + manual 
8KROM, 16KRAM. Please add $1.50 S&H 
$1 for cat. (Refunded with order.) 
N.J. add 6% tax. M.C. HOFFMAN CO., 
P.O. BOX 117, OAKLAND, N.J. 07436 

*** STOCK MARKET CASSETTE (16K) *** 
PORTFOLIO MANAGEMENT: Maintains 
Records Of Securities You've Bought 
And Sold. Analysis Provides 12 Dif¬ 
ferent Listings(Gains, Loss, Dates, 
Yields, Etc.) Holds 100+ Securities 
SIDE 2-PROGRAM FOR MARKET FORECAST. 
$9.95 TO TELETEK CO? #15 CENTRAL WY 
SUITE 169? KIRKLAND, WA, 98033 


I/O BOARD_PRINTER INTERFACE.... 

8255 Board for Sinclair/Timexl000 
3-Ports: 1-in,2-out or 3-out.PortC 
bit-programmable...Reset line.$45 
Printer Interface for Centronics 

style parallel port printer. 

requires I/O board. $60 

Professional Electronics,109 Ches- 
ney Lane, Columbia,S.C. 29209 

//2K Programs from 2-BIT SOFTWARE/ / 
//Mind vs. Machine $9.95/ Free // 
//catalog games/educational soft-// 
//ware. 2-BIT SOFTWARE, Dept SY1,// 
//13674 Boquita, DelMar, CA 92014// 

MARBLES > MAZES AND SINK HOLES 
A simple non-destructive game of 
skill and logic for all members of 
the family. 15 levels of play, from 
very easy to extremely difficult, 
each with 4 different screen types 
giving 60 full-screen displays. 
Score displayed as time taken. Auto 
clock enforces time limt? auto run 
and return to basic features. 100% 
machine code program for ZX81 or 
TS1000 with 16K RAM. Cassette $15, 
Mass residents add 750 sales tax. 
CHARLES DRURY, 40 WESTGATE RD #5, 
CHESTNUT HILL, MA 02167 

LEARN DATA HANDLING TECHNIQUES with 
ZX Data Finder, a versatile file 
manager for 16K ZX81s. All routines 
thoroughly explained. Concepts and 
dozens of memory saving methods are 
analyzed. List/text $9.95-free info 
Tom Woods Box 64 Jefferson,NH 03583 

* GAMES, BUSINESS AND EDUCATIONAL * 
Software For The ZX81 & T/S1000 
For A Catalogue Send A SASE To: 
BRONZE STAR SOFTWARE 
PO BOX 265, CHICAGO RIDGE, IL 60415 

ENHANCE YOUR ZX81-TS1000 SYSTEM 
Beautiful walnut/cherry cabinet 
Large keyboard, 6 dedicated keys 
Reliable ribbon/card connectors 
Improved heatsink and audiojacks 
Space inside for expansion boards 
More extras. SEND $1 & SPECS for 
detailed quote."DO LOOPS" WORKSHOPS 
209 Maple, Harleysville, PA 19438 














***** ZX81 - TS/1000 SOFTWARE ***** 
ENTERTAINMENT - EDUCATION 
STRATEGY - MASTERCODE 16K 9.95 

EDUCATION- MATH DEFENSE 16K 9.95 

ADVENTURE- BERMUDA SHORTZ 16K 14.95 
REFERENCE- ZX81 POCKETBOOK 10.95 
Add $1.50 Shipping For Each Item 
GAMES - TEXT ADVENTURES - BOOKS 
Send $1 P/H For Catalog & FREE Game 
SOFTWARE UNLIMITED 
PO BOX 147 GRANDVIEW,MO 64030 

OUR POLICY ON CONTRIBUTED MATERIAL 


NEW & UNIQUE IN CANADA 
INTEGRATED DATA SYSTEMS 
11 Brighton Av Toronto Ont M4M 1P3 
ZON-81 $61.60; Kayde 16KRAM,or4KROM 
900 char graphics $75.60; Software 
8/16K:$13.70ea Peckman,Murgatroyds, 
Mugsy; $14.60 ea Tank Trap, Marine 
Rescue, Alien Invasion, Red Alert; 
Mazogs $27.90; ZX Chess II $29.30; 
Software from Orbyte; Home Budget, 
Home Inventory, Mega Mind, Salvo, 
$18.70 ea; Execusoft Series $128; 
from Timeworks; Star Battle, The 
Money Manager, The Electronic Check 
book, $23.48ea; Robbers of the Lost 
Tomb $20.71. Min ord $25 w/MO+$1.50 
P&H. Outside Canada less 20% & send 
that amount as US$.Ont res +7% PST. 
Deliv 5wk ARO.Send for N/C CATALOG. 

i-IPRINT BIG on your ZX80/81 

! ADS IN !ltrs/figs 5 times larger! 

! SYNTAX iCursor w/Edit Functions ! 

! PAYOFF 1BASIC (List Learn/Change) 

i-!8K ROM/16K RAM !-! 

Cassette w/instructions ! IT'S A ! 
Great window displays ! ! BABY ! 

Send check or m.o. today ! GIRL ! 

$7.95+$l S&H($2 out USA) !-! 

MT-SOFT, BOX 2638, Aurora,II. 60507 

FREE!2programs on tape.Write:Prog¬ 
rams,3763 W. Crocus, Phx, Az 85023 


SYNTAX invites you to express opinions related to any Sinclair computer or 
peripheral, or the newsletter. We will print, as space allows, letters discussing items 
of general interest. Of course, we reserve the right to edit letters to a suitable length 
and to refuse publication of any material. 

We welcome program listings for all levels of expertise and written in either 
Sinclair BASIC or Z80 machine code. Programs can be for any fun or useful 
purpose. We will test run each one before publishing it, but we will not debug 
programs; please send only workable listings. Programs submitted on cassette can be 
tested more quickly and with less chance of error. 

In return for your listing, we will pay you a token fee of $2.00 per program we 
use. This payment gives us the nonexclusive right to use that program in any form, 
world-wide. This means you can still use it, sell it, or give it away, and so can we. 

We will consider submissions of news and hardware or software reviews. Please 
keep articles short (350-400 words). Again, we reserve the right to edit accepted 
articles to a suitable length. We will pay 7 cents per 6 characters, including spaces 
and punctuation, for accepted articles. 

When you send in programs for possible publication in SYNTAX, please 
include the following information: 

• How to operate the program, including what to input if it does not contain 
prompts. 

• Whether you can run the program over again and how. 

• How to exit the program. 

• The Syntactic Sum (program published in Feb. 81 and Jun. 81; send SASE 
for a free copy). 

• What RAM size program requires. 

• What ROM program uses. 

We pay for this explanatory text at the same rate as for articles in addition to 
payment for the program itself. 

If you want us to return your original program listing or article, please include 
a self-addressed, stamped envelope. Otherwise, we cannot return submitted material. 


SYNTAX is published 

monthly by a wholly-owned 
subsidiary of The Harvard Group. 

Syntax ZX80, Inc. 

RD 2, Box 457, Harvard, MA 01451. 

Telephone 617/456-3661. 

12 issues, $29. Single issue, $4. 

Publisher: Kirtland H. Olson 
Editor: Ann L. Zevnik 
Assistant Editor: Pamela Petrakos- 
Wilson 

Editorial Assistant: Pamela K. Vinal 

© Syntax ZX80, Inc., 1983. All rights 
reserved. Photocopying prohibited. 
ISSN 0273-2696 


YES! Please send me 12 issues of SYNTAX for $29. 

□ My check for $29 is enclosed. □ Please charge my □ MasterCard 
Make checks payable to: □ Diner’s Club □ American Express 

SYNTAX ZX80, INC. □ VISA □ Carte Blafiche account 

account number_ 

exp. date_bank number (MC only)_ 

signature_ 

Name_Title_ 

Organization_ 

Address_ 

City_State_Zip_ 

Day PhoneJ_)_Evening Phone_i_)_ 

Z-83 

I own a □ Sinclair ZX80 □ Sinclair ZX81 Telephone orders call 

617-456-3661 


23 










SYNTAX 


BUSINESS AND HOME SOFTWARE TAPES 


* THE MOST COMPLETE SOURCE OF * 
SERVICES I£ NOW AVAILABLE FOR THE 
COMPUTER ENTERPRNEUR. From Data 
Cassettes/Duplication/Production 
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Still have THE EXPANDABLE ZX-80 AND 
ZX-81/ TS-1000 Too! 9.95 + 1.25 P&H 
Also, VIDEO UPGRADE KITS FOR ZX-80 
w ith 8K ROM. 32.50 + 2.50 P&H. 
COMPUTER ENGINEERING SERVICES 
P.O. Box 1222 ShowLow, Az. 85901 

ZX PRINTER PAPER ROLLS-Bolder print 
Paler metallic base. Quality & fast 
service. SAVE! 3pac/$12 ppd . E. Al¬ 
varez, PO Box 1025, Oviedo FL 32765 

$3.50 PPD BUDGET/FINANCE SOFTWARE 
PRGM LISTING with line for line 
explanation . Educational,useful 
application prgm for beginner, 
continues where ZX81/TS1000 manual 
leaves off. 8k/6k RAM. GROMBACHER 
4564 QUEENS WAY, SIERRA VISTA AZ. 
85635 

LASER WARS 8K/1K..! LOW!PRICES!.1.95 
CHEWTER TM(like Pacmn) 8/lup....2.95 

Plotting Work Sheet 8/16.6.95 

Order,SASE,reSASE gets you GOO¬ 
DIES Catalog & !!!FREE!!! Program 
..Dealer Queries Welcome 
EZRA GROUP II POB 5222 SanDiego 

EZRA GROUP II California 92105 


EZ BOOKKEEPING.$15.95 

CHECKING.$ 9.9,5 

WORD PROCESSOR.$13.95 

5 BUSINESS PROGRAMS.$10.95 


MACHINE CODE NIT-PICK.$10.95 

LIST FOR TOP 3 PROGRAMS...$5.95e 
Send SASE For Details 
FREE COD Charges 

Phone Your Order Today (24 Hour) 

Call (414) 276-8787 
_*_ 

FOR INFORMATION: (414) 843-3990 

P/P FOR JIM UNTILL 10PM. C.S.T. 

_*_ 

Mail Order: 5% Off for M.O. 

Order From: C.E.D Corporation 

P.O. BOX 222 SALEM, WI. 53168 

**** EXPERIENCE SINCE 1970 **** 

**AS DESCRIBED IN DEC.'82 POPULAR** 
SCIENCE!!! THE SINCLAIR COMPUTER 
FAMILY SOURCEBOOK gives 100 pg. of 
detailed information about products 
for YOUR computer! Only $6.95 + $1.25 
P+H. Send check or MO to ATLANTIC 
COMPUTER Box 936 Norfolk, VA 23501 

** SUPER CMOS 2KX8 STATIC RAM SALE ** 
6116P3-150nS $24/4 $40/8,+$2 P&H 
Send check or MO SASE FOR FULL LIST 
BHPE 3473 WOODLAWN GURNEE IL 60031 


24 


H\R\ARD 

GRCXP 

Bolton Road, Harvard, Mass. 01451 


First Class 


U.S. Postage 
PAID 

Harvard, MA 
Permit No.8 
01451 


MR WILLIAM TOMLINSON 58 68 

3635 RIVEREDGE DR. 

JACKSONVILLE FL 32211