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SYNTAX 


Serving Timex-Sinclair 
Personal Computers 


A PUBLICATION OF THE HARVARD GROUP 


VOL.4 NO.5 


ISSN 0273-2696 


MAY, 1983 


IN THIS ISSUE 


TIMEX TO SELL REPLACEMENT PARTS FOR TS1000 


8K Programs 

Banner Writer.10 

Personal Net Worth....14 

Classified Ads.22 

Dear Editor.12 

Decimal to Floating 

Point Binary.8 

Hardware Review 

Memotech Keyboard.17 

Sun KD-81 Keyboard.5 

News, New Products 

and Services.1,2 

Program Improvements.... 3 
Running MC in a String 

Variable.20 

Software Tips— 

Save on SAVE 

and LOAD.18 

Subscription Info.23 

Vendor Report.18 

Users' Groups......22 

The ZX/TS and 2716 
45 0ns EPROMS.7 


Index of Advertisers 


Biocal Software.18 

Brainchild Computer....10 

Byte-Back Co.8 

Byte-Size Micro Tech...17 

Discount Software.5 

Expense Cutters.18 

Ganhart/Earthling Inc..15 
Gladstone Electronics..21 

Kopak Creations.19 

Melbourne House.7 

Memotech Corp.4 

Pegasus Micro Systems...5 

R.I.S.T. Inc.20 

Suntronics Co, Inc.11 

Timex Sinclair User....16 

Zebra Systems.6 

Zeta Computer.9 


You will be able to get Timex replacement 
parts for your TS1000 sometime this spring. 
According to Carlos Dragovich of Timex, the 
Little Rock, AR, facility will sell parts and 
schematics, probably by this May. Timex will 
also set up an 800-number line for inquiries. 

MEMOTECH 32K-TIMEX INCOMPATIBILITY REPORTED 

Readers report their Memotech 32K RAMs do not 
work with TS2040 printers. Memotech knows 
about this problem and sent a TS2040 to its 
British office for testing. Said Fateh of 
Memotech told us one customer exchanged his 
TS2040 for another, which does work with his 
32K RAM. So far no theories on the cause. 

DEFECTIVE LASERSCAN RAM REPLACEMENT AVAILABLE 

Laserscan Electronics just discovered that 
some of their early model 16K RAM packs, 
produced until mid-January 1983, are defec¬ 
tive. These RAMs are green and carry the 
number CB-004 on the circuit board. Laser¬ 
scan will replace your early model 16K RAM 
free of charge. President Dennis Hawkins 
says the new RAM, smaller and white, has no 
reported problems. He adds you can,get a 
free listing of Laserscan's ZX81 Disassembler 
and Tic Tac Toe programs for an SASE. Laser¬ 
scan Electronics, 2305 Broadway, Riviera 
Beach, FL 33404, 305/842-4255/ 

NORRIS ELECTRONICS BACK IN SLIDELL 

We reported incorrectly that Norris Electron¬ 
ics moved to Metairie, LA (Apr.83). Tracy 
is at his former 144 Terry Dr., Slidell, LA, 
address. Please don't call his beleaguered 
relative at the Metairie number. Contact 
Eileen Linker, Office of Consumer Protection, 
POB 44091 Capitol Station, Baton Rouge, LA 
70804-4091, 504/925-4401 for complaints. 


1 


























NEW PRODUCTS AND SERVICES 


Timex announces new 2-16K software 
for kids and adults, $9.95-$19.95, 
available in retail stores: IRA 
Planner, Home Improvement Planner, 
Ator the ABC Gator, Punctuation 
Master, Geometry I, Algebra I and 
II, Frogger and Stock Market Game. 

J.V. Kane's system to measure vol¬ 
tages, temperatures—complete ana¬ 
log-digital computer systems in¬ 
clude 64K TS1000 with ZX printer, 
assembler, disassembler, utilities, 
A/D input/output routines, TV or 
monitor, recorder, 8 analog inputs 
and outputs with 8-bit resolution 
and 2ms read time. $1000. J.V. 
Kane and Co., 109 Ardmore Ave., 
Ardmore, PA 19003, 215/649-1782. 

Silicon Valley North of Hammond, IN 
(where smokestacks meet RAM packs), 
offers ZX/TS education software. 

Its menu-driven first program, 
GRADEBOOK, is sophisticated, flexi¬ 
ble and friendly, says president R. 
Boltuck. User club discounts. 

Free catalog and simulated output 
for SAE. Tape with documentation, 
$7.95 plus $1 P&H. Silicon Valley 
North, POB 2442, Hammond, IN 46323. 

Data Storage and Display System 
gives you graphing capabilities in 
a data storage program. Enter data 
then recall it as a tabular list or 
graph. Either display gives a 
summary of highest and lowest 
points, closing point, file number 
and title, file sum and mean score. 
Menu-driven. On tape, $14.75 plus 
$1.25 P&H. ZX-Panding, POB 25, 
Newton, NC 28658. 

Mutual Fund Advisor helps you buy 
and sell no-load mutual funds. 16K 
tape, listing, instructions and 
sample data, $12.95 plus $1.25 P&H. 
16K Compute helps you work with 
math or statistics. $14.95 plus 
$1.25 P&H. Both by Rolf Miller, 
from Computer Engineering Services, 
POB 1222, Show Low, AZ 85901. 


Handy utilities from M-Ware: ZX to 
ASCII code, decimal-hex-binary and 
degrees-radians conversions, plot 
sine, parabola and circles, and 
memory remaining. Tape plus in¬ 
structions, $11.95. M-Ware, Garnet 
Ridge Road, Rt.l, Hiram, GA 30141, 
404/445-6544. 

Virtuoso, a 2K music synthesis 
program, offers 10-octave range, 
150-note length, whole to 32nd and 
dotted notes and rests. It plays 
through TV, amplifier or AM radio. 
Tape and instructions (includes 
coding from written music for non¬ 
musicians), $6.95 (no P&H in US). 

W. D. Maples, 688 Moore St., Dept. 

X, Lakewood, CO 80215. 

Find pinouts for virtually all 
54/7400 TTL ICs on a single card. 
Two-sided, two-color card of du¬ 
rable plastic covers part number, 
family type, description and pinout 
in compact tabular format. $5.95 
plus $1 P&H. Micro Logic Corp., 

POB 174, 100 Second St., Hacken¬ 
sack, NJ 07602, 201/342-6518. 

SL-6 Shift lock kit for ZX/TS/ 
MicroAce computers gives one-finger 
typing. Tap the adjustable touch- 
sensitive contact and SHIFT key 
holds for 3-5 keystrokes. LED in¬ 
dicates SHIFT on. Kit (SL-6 mod¬ 
ule, capacitor, LED) $17.46 ppd 
first class. BC-80 blinking cursor 
module for ZX80S causes normal and 
syntax error cursors plus various 
graphics to blink, $17.46 ppd. 1st 
class. Kaltek Calculator Technolo¬ 
gy, Box 7462, Rochester, NY 14615, 
or Box 971, Adjuntas, PR 00601. 

Design and print upper/lower case, 
special foreign language letters, 
or any new characters. 20K program 
requires 64K RAM and ZX printer. 

On tape with two keyboard overlays 
and instructions, $22.50 money 
order or check (five-week delivery 
on check orders). J.J. Castillos, 
POB 7274 Station A, Toronto, Ont. 
Canada M5W 1X9. 


2 





Two new program listings: Madame 
Ruby simulates artificial intelli¬ 
gence in matters of life, love and 
health. 16K listing, $5. Arcade 
games package gives two 16K list¬ 
ings, Tic Tac Toe and Tank Zap. 

$3. Florida Creations, POB 16422, 
Jacksonville, FL 32245. 

See those bats and dragons with new 
animated adventure game, Caves of 
Zulu. Needs 16K RAM. $19.95 plus 
$2 P&H. Stuart Software, 25381-G 
Alicia Pkwy., Suite 316, Laguna 
Hills, CA 92653, 714/855-4753. 

Build a 16K RAM for $39.95, option¬ 
al plastic case $4.95. Assembled 
16K RAM $44.95. Add $2.95 P&H, FL 
residents add 5%. 90-day warranty, 
layaway available. Laserscan Elec¬ 
tronics Corp., 2305 Broadway, Riv¬ 
iera Beach, FL 33404, 305/842-4255. 

Personal Weight Control Program 
helps tailor and monitor your diet. 
Tape and guide available from IPS 
distributors for $29.95. Interna¬ 
tional Publishing and Software, 

3952 Chesswood Dr., Downsview, Ont. 
Canada M3J 2W6, 416/636-9409. 

Working Mother's Dilemma offers 
four 2K games: Mad Dash, Carfool, 
Harried Housewife and Shopping 
Mall. $14.95 (CA residents add 
6%). 2-Bit Software, POB 2036, Del 
Mar, CA 92014, 619/481-3629. 

The SoecialWare Directory lists 
instructional, administrative, pro¬ 
fessional and evaluation software 
for special education. Expect some 
but not lots of ZX/TS software, out 
late May. LINC, 1875 Morse Rd., 
Suite 215, Columbus, OH 43229, 
614/263-2123. 

Sell your programs through on-line 
referrals to software publishers. 
Listing and one program category, 
$20, extra categories $5 each. 

Blind box service $10. Program¬ 
mers' Pipeline, POB 666, Glendora, 
CA 91740, 213/914-4317. 


PROGRAM IMPROVEMENTS 

Here's a more efficient way to sim¬ 
ulate ON GOTO statements (Feb.83). 
Look at this short program: 



To adapt it^change line_30_to: 



This line directs the computer to 
the designated line numbers when an 
A value matches. When A does not 
equal a listed value, the computer 
goes to line 0. Thus, the last 
part (40 AND A<1 OR A>4) sends the 
computer to the next line number. 

Carl Bush, Baltimore, MD 


Joe Glass noted his program Office 
Manager (Apr.83) gives an error 5 
when you view files. Add: 



George T. Milonas, Tacoma, WA 

In Office Manager, menu choices 3 
and 9 incorrectly imply you can 
alter phone book and report files. 
The word "ALTER" should read "ADD." 

To alter files, add this line: 
2906 PRINT L 

When you choose menu item 12 the 
slot number prints before the line. 
Then enter in the immediate.mode: 
LET F$(slot) ="altered information" 
GOTO 2900 

Also, the program cannot reach 
line 250; it serves no purpose. 

R.B. Mason, Arlington, VA 


3 


































TIMEX MAKES THE 

COMPUTER, 

BUT WE MAKE IT TICK. 



If you own a TS-1000 or ZX-81 computer and want to bring out the power within it, you’ll want Memotech. From easier input to high 
quality output and greater memory, Memotech makes the add-ons you demand. Every Memotech peripheral 
comes in a black anodized aluminum case and is designed to fit together in “piggy back” fashion enabling you 
| I to continue to add on and still keep an integrated system look. . . 

MEMOPAK RAM All Memopak RAMs are directly addressable, user transparent, are neither switched nor 
paged and no additional power supply is required. You can also choose the Memopak RAM which is just 
right for your needs. From economy to power. 16K RAM The Memopak l 6 K RAM is the most 
economical way to add memory to your TS-1000. It is fully compatible with the Timex or Memotech l 6 K 
RAMs to provide you with up to 32K of RAM. The 16K RAM also offers additional add-on capabilities 
through its “piggy back” connection. 32K RAM The 322K Memopak enables you to execute 
sophisticated programs and store large data bases and like the 16K RAM is fully compatible with Timex’s or 
Memotech’s 16K RAMs to give you a full 48K of RAM. 64K RAM The 64K Memopak is powerful 
| - enough to turn your TS-1000 into a computer with capabilities suitable for business and educational use. It 

I_I accepts such BASIC commands as 10 DIM A (9000). MEMOCALC Memocalc, our spreadsheet analysis 

software, enables TS-1000 users to perform complex number crunching routines with ease. With i- 

the 64K RAM a table of up to 7000 numbers with up to 250 rows or 99 columns can be specified. 

Quick revisions can be achieved by entering new data to your formula. 

MEMOTECH KEYBOARD For ease of operation, the Memotech keyboard is a high quality 
standard typewriter keyboard, with TS-1000 legends. The keyboard is cable connected to a buffered 

interface which is housed in a standard Memopak case and plugs directly into the back of the '-—— ^ - 

I ~ I TS-1000 or other Memopaks. MEMOPAK HRG The Memopak High Resolution Graphics, with 

up to 192 by 248 pixel resolution, enables display of high resolution “arcade game” style graphics 
through its resident 2K EPROM, programmed with a full range of graphics subroutines. 

CENTRONICS PARALLEL AND RS232 INTERFACES |-— 

Memotech’s Interfaces enable your TS-1000 to use a wide range of ill 

1 —• " . I compatible printers. The resident software in the units gives the ' 

complete ASCII set of characters. Both Memopak Interfaces provide lower case character capabilities and 
up to 80 column printing. The RS232 Interface is also compatible with modems and terminals. 

SEIKOSHA GP IOOA PRINTER The Seikosha GP 100A uses a 5x7 dot matrix printing format with 

ASCII standard upper and lower case character set. Printing speed is 30 characters/second with a *“—■— -—- ——— 1 

maximum width of 80 characters. The printer uses standard fanfold paper up to I I 

9-1/2 inches wide. The GP 100A is offered as a package including cable and I code: stx -5 , 1 

■ 1 interface. Other printer packages are also j , -——j 

rwwi available through Memotech. | 32 kram_ 99^5 _I 

ORDER AT NO RISK. All Memotech I MKRAM _ ww ' _I 

products carry our 10 day money back | 

guarantee. If you’re not completely j High Resown Graphics " 99.95 

satisfied, return it within ten days and we j Centronics Parallel Interface 74.95 

I will give you a full refund. And every | 18232 lnterface -^_ 

fe P roduct comes with a six j - ZS~ 

i--—-——. month warranty. Should anything be * Shipping and Handling 4.95 $ 4.95 | 

defective with your Memotech product, return it to us and we will repair or replace I Thx (Colorado residents only) | 

it free of charge. Dealer inquiries welcome. To order any Memotech product use -—---1 

the order coupon or call our toll-free number 800 /A 62 -OQ 4 Q I 

J J * . □ check □ MasterCard □ Visa 

TS-1000 is a registered trademark of Timex Corp. 


m 

m 1 | 

_ aiiiii 



CORPORATION 


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


| 16K RAM 

$ 49.95 


| 32KRAM 

99.95 


| 64K RAM 

149.95 


| Memocalc 

4995 


1 Keyboard with Interface 

99.95 


1 High Resolution Graphics 

99-95 


1 Centronics Parallel Interface 

74.95 


, RS232 Interface 

99 95 


| Printer Cable 

1995 


] GP 100A Printer Package** 

39900 


* Shipping and Handling 

4.95 

$ 4.95 | 

1 Thx (Colorado residents only) 

1 TOTAL $ 

• *A11 prices quoted in U.S. dollars. Prices and specifications subject to change without notice. | 

| **Please add an additional $5.00 for printer shipping charges. 

| □ Check □ MasterCard □ Visa 

1 Account No. 

Exd. 

1 

! \ > 

« Name 

1 


Phone number 

j Address 


State 
















HARDWARE REVIEW 

Product: Sun KD-81 full-size 

keyboard conversion for 
the ZX/TS 

From: Suntronics Co., Inc. 

12621 Crenshaw Blvd. 
Hawthorne, CA 90250 
Price: $69.95 plus $4 (P&H) 

CA residents add 6% 

"Easy to install—no soldering, 
no modifications," said the ad. 
Guess what? It was right! 

In five minutes I felt like a 
professional programmer, efficient¬ 
ly inputting on a fast, full-sized 
keyboard. Installation is easy: 

1. Remove three screws under foot 
pads securing ZX/TS case and two 
screws holding ZX/TS PCB. Remove 
the bottom case, then the two 
screws holding the top case. 

2. Unplug the two ribbon cables 
from the ZX/TS keyboard. 

3. Attach the PCB to the KD-81 
case with four screws and washers. 

4. Plug the two ribbon cables from 
the KD-81 keyboard into the KD-81 
keyboard case. 

5. Close the case and install the 
remaining four screws in the bottom 
of the KD-81 case. (All screws and 
washers are supplied.) 

You get a professional-looking 
full-size keyboard with 41 keys, 
including a full-size space bar and 
shift keys on both sides of the 
keyboard. Keytops spell out com¬ 
mands and illustrate graphics for 
easy entry. Two colors make the 
keys easy to read. High-impact 
black plastic and vaporized metal 
shielding enclose the keyboard. 

I like the unit's close resem¬ 
blance to the original keyboard; 
following the ZX/TS manual is easy 
as pie. The new shift key where 
the space key was and the full-size 
space bar make touch typing con¬ 
venient and comfortable. 

I highly recommend this prod¬ 
uct to Timex Sinclair users. 

Daryl Faulkner, Fountain Valley, CA 



5 




















ZEBRA JOYSTICK ADAPTOR 


joystick action games] 


Allows you to connect any Atari compatible joystick to your ZX81 or TS1000 


8 DIRECTIONS 
& FIRE 
CONTROL 


6 JOYSTICK GAMES $9.95 
ATARI JOYSTICK $6.50 
ADAPTOR $19.95 

The ZEBRA Joystick Adaptor comes 
assembled and tested with simple 
instructions to make joystick 
versions of most action games. 

Use your own Atari compatible 
joystick or add $6.50 for a 
genuine Atari Joystick. 

15 DAY MONEY BACK 
GUARANTEE 


EXPANSION 
CONNECTOR FOR 
YOUR MEMORY, 
PRINTER, ETC. 


SIMPLY 
PLUG IT 
IN. 


ACCEPTS ANY 
ATARI-COMPATIBLE 
JOYSTICK ^ 


ONLY 

$ 19.95 

WITHOUT SPEAKER 

$ 24.95 

WITH SPEAKER 


BLIPPO 


EXPANSION 

CONNECTOR 


Add amazing sound effects to your games. 
Easy to program in BASIC. 

Wide frequency range. 

Assembled and tested, with Demo software 


ZEBRA LIGHT PEN 

• Fun to experiment in BASIC 

• Complete package includes 
-Light Pen 

-Computer Interface Module 
-Demo Program Listings 

• Assembled & Tested 

ORDER C109 $24.95 


AMAZING 
SOUND EFFECTS 


SPEAKER 

MODULE 


SUPERGAMES 


PROTOTYPING? 

EXPERIMENTING? 


30 

MONSTER 

MAZE 

Cl 13 
$14.95 


cm 

UNIVERSAL 
PATTERN FOR 
IC’S, CAPS, 
ETC. 


C102 BYTING DEEPER INTO YOUR TS1000 . . . 
C103 NOT JUST 30 PROGRAMS FOR THE ZX81 
C104 COMPLETE T/S BASIC COURSE. 


Cl 12 

PIGGY BACK 
RAM OR OTHER 
PERIPHERALS 


C110 

ALL SIGNALS 
LABELED 


GOBBLE 

MAN 

Cl 14 
$14.95 


C110 Keyed & Labeled ZX Connector $5.95 
C111 Universal Prototyping Board .. $9.95 
Cl 12 Expansion Connector. $2.50 


C105 UNDERSTANDING YOUR ZX81 ROM .... 
C106 MACHINE LANGUAGE MADE SIMPLE ... 
C107 THE INS & OUTS OF THE TS1000 & ZX81 


IMPORTANT! All ZEBRA products 
can be piggybacked in any order. 
Your memory, printer, etc. will plug 
into the last one. 


Order Toll Free 
800 - 221-0916 


15 DAY MONEY BACK 
GUARANTEE ON ALL 
ZEBRA HARDWARE. 


Tech Info & NY State call 
(212) 296-2385 9-5 EST 


ZEBRA SYSTEMS, INC 


ADD $2.00 PER ORDER 
FOR SHIPPING. 

WE ACCEPT VISA, MASTERCARD, 
CHECKS, M.O. 

COD. ADD $3.00 EXTRA. 

NY RESIDENTS ADD SALES TAX. 
OVERSEAS, FPO, APO, ADD 10%. 
DEALER DISCOUNTS AVAILABLE. 


78-06 Jamaica Avenue, Woodhaven, New York 11421 














THE ZX/TS AND 2716 450ns EPROMS 


You may run into trouble using 
450ns 2916 EPROMs on your ZX/TS. 
Though the PROM programs and veri¬ 
fies in the programmer, it won't 
function. The problem results from 
inadequate speed—the EPROM must 
respond in less than 427ns; most 
2716s offer 450ns response. 

Let's examine an operating tim¬ 
ing cycle to see where the problem 
lies, then look at available solu¬ 
tions. You'll see why you can pro¬ 
gram and verify a 450ns EPROM, but 
you cannot use it. 

Consider all Z80 CPU instruc¬ 
tions in a ZX/TS computer as a se¬ 
quence of basic machine operations. 
The most fundamental of these is an 
operation-code fetch (OFC), called 
machine cycle 1 or simply Ml. With 
this operation the CPU fetches the 
instructions to execute from the 
program stored in memory. 

Each machine cycle is divided 
further into a series of T states. 


For example, the basic Ml cycle 
consists of four T states. The 
processor's frequency (3.25 MHz for 
the ZX/TS's Z-80A) determines the 
length of each T state. So each T 
state's period is 1/3.25 micro¬ 
seconds or 308ns. 

Examining an OCF timing dia¬ 
gram, we see that MREQ NOT goes low 
halfway through the first T state 
and that the CPU reads the data on 
the bus with the rising edge of the 
third T state. Ideally then the 
memory device has only 3/2 T states 
to get ready to be read in an Ml 
OCF operation if the MREQ NOT sig¬ 
nal is used in the device's address 
decoding (as is usual). This time 
amounts to 462ns. 

Unfortunately, propagation de¬ 
lays through the decoder used to 
select the particular memory device 
reduce this time. Each LSTTL gate 
used delays the device select sig¬ 
nal by about 5ns. For example, an 
MREQ NOT signal might be delayed 
about 35ns when delivered through 


At last a reference manual 
which covers all the hardware 

_aspects oftheTS1000-includes 

fSldOO | com P* ete circuit diagrams! 



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 $34.5 

25957 Machine Language Programming 

Made Simple $14.9 

20922 The Complete Timex/Sinclair 

ROM Disassembly $19.9 

26025 Not Only 30 Programs $9.9 

25913 Understanding Your ZX81 ROM $14.9 

□ 51539 InsandOuts $12.9 

TAPES: 

13941 Gamestapel:llPrograms-lK $14.9 


n 13942 Gamestape2:3Games-i6K 

13943 Gamestape 3: Catacombs 
Adventure-16K 

13944 Gamestape 4:3D Monster Maze-16K 

13945 Gamestape 5:3DOrbiter-l6K 
26446 Space Trek-16K 

26359 Super invasion-IK 
[ 26318 WallBusters-IK 

□ 26472 10 Exciting Programs-lK 
r 26284 Reversi-IK 

26406 TOOlbOX-IK 

26490 Basic Course 2 cassette pack 

□ 14026 Combat Flight-16K 

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 $_ 

Please charge my Visa or MasterCard card#. 
Signature_ 


expiration date. 


MELBOURNE HOUSE SOFTWARE 
















two halves of a 74LS139 decoder. 

The time available to the memory 
device is therefore reduced to 462 
minus 35ns, or 427ns. 

Maximum CE NOT to output delay 
(tp E ) of a 2716 450ns EPROM is 
450ns. Some offer an access time 
lower than 450ns but others are 
near the limit. Using 450ns EPROMs 
in a system running at 3.25 MHz is 
therefore marginal at best. 

You have two options: use 
EPROMs with a shorter access time 
(you can now get single 2716-1 
350ns EPROMs for $4.50), or insert 
a wait state into every Ml cycle, 
increasing the time available to 
the memory device by one T state to 
769ns (ideally). See Figure 1. 

Ordinary memory read opera¬ 
tions add an additional half T 
state before the CPU samples the 
data on the bus. In other words, 
the memory device has 615ns to get 
ready. This extra delay can lead 
to the frustrating phenomenon of 
being able to verify a 450ns EPROM 


MODULES FOR: 


TIMEX-Sinclair 


MODEM $119 .95 (RS-232) Port & Software 



$149." ASSEMBLED 


Included) 


64-K MEMORY $129.?? T 

the “ULTIMATE MEMORY" 
FEATURES: $139. K ASSEMBLED 

• Battery backup K . 

• PROM/ROM socket 

• Reset Switch 

_ * • BYTE-BACK EXCLUSIVE FULL 64-K 

The 0-8K area is available. You can execute a copy routine (provided) to 
copy the TIMEX ROM into the 0-8K area of RAM then flip a switch and you 
have your operating system in RAM. You can modify it and create your 
own customized operating system. 

WHY PAY MORE FOR LESS FEATURES? 

GET THE “ULTIMATE MEMORY" BYTE-BACK UM-64 


A COMPANY YOU CAN DEPEND ON 

BYTE-BACK CO. is the oldest and one of the world’s largest 
suppliers of modules for the ZX81 and TIMEX-Sinclair 1000 
computers. There are thousands of BYTE-BACK modules in use 
with a track record of proven reliability. 

RS-232 PRINTER INTERFACE Only $59.** KIT $69.“ ASSEMBLED 
CONTROL MODULE 8 Relays, 8 Inputs, $59. 95 KIT $69“ ASSEMBLED 

16K MEMORY UM16 $59. 95 kit $69. k assembled & tested. 
Battery backup, reset switch, PROM/ROM socket PLUS. . . . 

1 year, 100% trade-in credit towards the UM-64. 

BYTE BACK CO. [ 1 3 

Rt. 3, Box 147, Brodie Road lLZ,5r | 

Leesville, S.C. 29070 _ ® 

ORDER PHONE 803-532-5812 PfjgP T7T? 

Add $4.95 shipping & handling to all orders. ■■■■* !''-■' X_y| 

90 Day Warranty On All Modules. 10—Day Return Priviledge 


with your ZX/TS EPROM programmer, 
but being unable to use it. 

Paul Hunter, Okemos, MI 

This circuit is not implemented in 
Hunter's non-volatile RAM.—AZ 



Figure 1. adding one wait state to an mi cycle 



Schematic courtesy Zilog Inc. 

+5 to pins 14, 13, 10, 1 of 7474 
0V to pin 7 of 7474 

DECIMAL TO FLOATING POINT BINARY 

John Bowden describes an inter¬ 
esting pencil-and-paper procedure 
to convert decimal numbers to ZX/TS 
floating point binary (Jan.83). 

His procedure works fine, but 
is slow and can only handle posi¬ 
tive integers smaller than 2**32. 
Your ZX/TS ROM has a number conver¬ 
sion routine that is faster, not as 
limited and easy to use. You can 
even use it in command mode: 



These three commands display a list 












of decimal values of the five bytes 
for number n, in Sinclair-type 
floating point format. But this 
routine requires a lot of typing to 
convert one number. 

It works by assigning a decimal 
number to the variable X0X, the 
last item stored in the variables 
area of program memory. The last- 
defined variable is always located 
just before the address held in 
system variable E_LINE. The second 
command PEEKS E_LINE to get the 
address. The third command backs 
up from that address and displays 
bytes containing the floating point 
number, exponent byte first, fol¬ 
lowed by the mantissa (decimal part 
of a logarithm) bytes in order of 
decreasing significance. 

Yet, a BASIC program modeled 
after the preceding command se¬ 
quence gives problems—primarily 
insuring X0X is always the last- 
defined variable. Avoid this prob¬ 
lem by using the variables start 
area marked by system variable 
VARS, rather than the variables end 
area marked by E_LINE. 

Listing 1 shows 11 lines you 
can use to start any program need¬ 
ing decimal to binary conversion. 

To use this program assign the 
decimal number (or numeric expres¬ 
sion) to variable X0X, and then 
GOSUB 50. When executing the pro¬ 
gram by RUN or GOTO, line 10 clears 
the variables area of program memo¬ 
ry. Thus, variable X0X initially 
gets the value 0 and becomes the 
first-defined variable. System 
variable VARS always holds variable 
X0X's address. 

On executing a program line 
that assigns a value to a variable, 
the computer automatically converts 
the value to floating point binary 
form and stores it that way. Line 
50 gets the X0X address from VARS. 
Lines 60-68 put each byte of the 
binary number into its own varia¬ 
ble. After the subroutine returns, 
the main program can do anything it 
likes with the information, held in 
variables ZlZ to Z5Z. 



ORGANIZE and PROTECT your VALUABLE 
software library the COLORFUL way with 
ZETAPAKS™ from ZETA Computer. 


Mix n' match your collection with these rugged-vinyl 
software "safes" in a choice of 4 COLORS. Now you can 
store your media TOGETHER with your instructions on the 
SAME shelf with your computer books. 



$3.50 EACH or 
$38.95 Per DOZEN 
Postpaid 

-COLORS- 

BEIGE 

TAN 

BLUE 

YELLOW 


HOLDS ALL TYPES OF SOFTWARE MEDIA 

Besides holding a 6 " * 8 V 2 " manual up to Vi 
ZETAPAK can hold 2 audio/digital cassettes 


thick, a 


or 2 stringy floppy cartridges 
or 2 of the new 3" micro disks 
or 6 514" floppy disks 
or 2 ROM cartridges (up to %" thick) 

Ask you local computer dealer to stock ZETAPAKS or 
ORDER DIRECT: ZETACOM Dept. SX 
P.O. BOX 3522 
GREENVILLE, SC 29608 
‘Specify how many of what color. 

‘Send Bank or PO Money Order for fastest service. 

‘COD is fast but $2 extra. ‘Please allow 4 weeks delivery on checks. 
‘Foreign: US Funds add .50 each for Air Mail. ‘Purchase Price of 
$3.00 each ZETAPAK REFUNDABLE if returned unopened within 
30 days. ‘SOFTWARE PUBLISHERS/DEALERS write or call for 
discount schedule...(803) 246-1741 after 1 P.M. EST. 

© tm 1983 ZETA Computer 

This conversion routine uses 
unique variable names to minimize 
inadvertent re-use of the same 
names later in the main program. 
Reusing variable names won't bother 
the conversion routine, but the 
main program might go berserk. 

This routine is reasonably 
fast, and can convert any number— 
positive, negative, fractional, or 
any ZX/TS numeric expression. 


C.C. Stadler, Orlando, FL 


Listing 1. 



9 















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 TMS991 8 VDP 

(32 sprite levels) 

* Module contains extension of basic commands 

including: PAPER/IN K/BOR DER/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. 


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 EH check EH 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 


BANNER WRITER—8K/2K 

Now that Timex's 2040 printer 
is available, why not use it to 
make computer-generated banners? 

BANNER WRITER prompts you for 
a message, then PEEKS into the ROM 
to get each individual letter. It 
blows it up to 32x normal size, 
turns it sideways, prints it on the 
screen, then copies the screen to 
the printer one letter at a time. 

Line 130 controls the back¬ 
ground—try another value. STEP in 
line 70 and variable G in the FOR- 
NEXT loop control the height and 
thickness of the lines. In line 
180, try using CH (from line 55) in 
place of CNTR. Generate inverse 
characters by swapping values in 
lines 130 and 150. Switching the 
order of A and B in line 180 ro¬ 
tates the letter another 45 
degrees—upside down. 

Enter any length message. 

Each character takes about 35 sec¬ 
onds in FAST to generate and print. 
Press RUN, ENTER to create another 
message; BREAK exits. 

Joseph P. Williamson, Timex Users' 
Group, Gainsville, FL 





lO 





































FULL SIZE KEYBOARD 
CONVERSION 

FOR 
YOUR 
ZX-81/ 

TS-1000 


Fully Warranteed 
For 90 Days! 

SUN KD-81 


If you're tired of not knowing whether your data got entered or tired of pok¬ 
ing data in with one or two fingers, then it’s time to upgrade your ZX-81 to 
a full size, professional keyboard. The SUN KD-81 KEYBOARD offers all 
the ease and comfort of imputting your programs and text on a fast and ef¬ 
ficient professional-sized keyboard! 

KD-81 FEATURES 


INSTALL 

• No Soldering 

• No Modifications 


• Full size keyboard with 41 keys 

• Two color silk-screened key tops 
for easy reading 

• Key tops have commands and 
graphics spelled out the same as 
ZX-81 

• Extra shift key for real keyboard- 
style typing 

• Full size space bar 

• Allows touch typing 

• Rear cutout allows any RAM or 


expansion module to be plugged 
in 

• Keyboard comes with own cables 

• Keyboard case holds both 
keyboard and computer with room 
to spare 

• High impact plastic case with 
vaporized metal shielding 

• Easy assembly — no soldering, 
no modifications 

• Measures 10%" x VU" x Th" 


GET A BETTER PICTURE WITH SAMWOO 

FOR YOUR SINCLAIR COMPUTERS 

The SAMWOO provides a much better picture than your TV 
monitor. Includes easy-to-follow instructions for a simple 
modification. . 




9" 18Mhz BANDWIDTH 12" 12Mhz BANDWIDTH 

Green. $121.00 Green. $130.00 

Orange. 125.00 Orange. 134.00 

Add $7.50 Shipping and Handling for this item. 


MONITORS 

Features: 

• Composite Video 
Input/Output 

• Switchable Input 
Impedance 75 or 
10K ohm 

• 750 Line Resolution 
at Center and 500 
Lines at Corners 

• Dimensions are 
12.13" x 11.34" x 
11.65" for the 12" 
model and 8.66" x 
8.54" x 9.05" for the 
9" model 



Check out these 
simple 
’ nsta *‘ 
lation 
J steps! 


1. Remove 4 screws securing ZX-81 case 
and remove 2 screws holding ZX-81 PCB. 

2. Unplug the 2 ribbon cables from the 
ZX-81 keyboard. 

3. Plug the 2 ribbon cables into the con¬ 
nectors on the KD-81 keyboard. 

4. Attach the ZX-81 PCB to the KD-81 
case with 2 screws, close case and install 
remaining 4 screws into the bottom of the 
KD-81 Keyboard case ... 

And enjoy the comfort and 
ease of inputting your data 
on a full size keyboard! 



SUmONICS CO., INC. 

12621 Crenshaw Blvd., Hawthorne, CA 90250 

STORE HOURS: MON.-FRI. 9:00 am to 6:00 pm 
SATURDAY 10:00 am to 5:00 pm 



CALIFORNIA OUTSIDE CALIFORNIA TOLL FREE 

213 - 644-1149 1 - 800 - 421-5775 

(for Tech Info and Calif, orders) (Order Desk Only) 

Mail Order — Minimum Order $10. Send Money Order or Check to P.O. BOX 1957 — 
DEPT. B, HAWTHORNE, CA 90250. VISA or Mastercard (please include expiration 
date). Add $4.00 postage and handling to order. CA residents add 6% sales tax. 











DEAR EDITOR: 


I am developing an interactive 
educational program. Unfortunately 
we are in a rural area at the very 
end of REA power lines over 20 
years old. The system inflicts 
frequent drop outs and power fail¬ 
ures, real disasters after five 
hours of programming. 

So I recently built a 15V regu¬ 
lated power supply and wanted a 
convenient package. I combined it 
in the same case as the battery 
back-up unit in SYNTAX, Aug.82. 

I built the full system as de¬ 
scribed, including filter cap and 
LED power indicator, but added a 
DPST power switch to control AC and 
output power (DC). I found with a 
switch controlling AC only turned 
off, the battery pack still 
supplies DC to the computer. I 
didn't want to unplug my ZX81 each 
time I shut down; now a simple 
double pole switch does the job. 

I housed the unit in a larger 
chassis (Radio Shack 270-269), and 
used both new and scavenged parts. 

My system works perfectly, with 
a total improvement cost (excluding 
power supply built earlier) under 
$20. A small price for peace of 
mind and non-disappearing programs. 

Joseph Dominiecki, Wisdom, MT 


If your printer copies the ZX/ 
TS printer buffer at address 16444 
or 403CH, you have this problem: 

Any floating point number with more 
than one and fewer than five lead¬ 
ing zeros (.01-.00009) prints gar¬ 
bage for the second through last 
leading zero. 

The Print-Ch routine at 07F1H 
carefully preserves the contents of 
the CPU's A register when printing 
to the screen. When the LPRINT 
flag is set, the Print-Ch routine 
falls through to the LPRINT subrou¬ 
tine at 0851H. This subroutine 
fills the buffer with Sinclair 
character code to output to the 
printer. Lprint-Ch leaves the A 


register loaded with the value of 
PR__CC (counter for the printer 
buffer). The print-a-floating- 
point-number subroutine at 16B2H 
outputs a decimal point, a zero, 
and loops up to four times, causing 
it to print leading zeros. The 
code for zero is stored in the A 
register. When this loop returns 
from Lprint-Ch, the A register is 
not set back to zero. 

Put the ROM onto EPROM (as in 
John Oliger's EPROM project, SQ, 
Winter 82), changing ROM address 
16BCH to FBH. Now the loop starts 
from the point where the A register 
is set to zero, correcting the bug. 

Mike Wagner, Waukesha, WI 


About a month ago I bought 
Sinclair's VU-FILE program, and it 
works well. I want to use Personal 
Software Services' QSAVE package 
with it, but your Nov.82 QSAVE 
review says that it will not work 
with self-running programs, nor 
with those that are saved by name. 
Since VU-FILE has both these fea¬ 
tures, I have not been able to 
eliminate them. How do I modify 
VU-FILE to use it with QSAVE? 

Paul Crecca, Tonawanda, NY 

Load it up and get to the main 
menu. Hit BREAK to get to the 
BASIC listing. From here you can 
change the lines for saving to use 
QSAVE's USR call, or leave the old 
ones (put a REM in front of each to 
inactivate it) and add new ones for 
QSAVE.—AZ 


Is it true that Sinclair's 
disk drives are only sequential 
access and not random access, due 
to Sinclair BASIC? As a TS1000 
owner, do I have any hope? 

Ralph Hilton, Salt Lake City, UT 

Sinclair Research in Boston says 
the "disk drive" about to appear in 
the UK is really a stringy floppy. 


12 



It runs a continuous loop tape, not 
a true disk. Thus its 3.5 second 
access is sequential. Sinclair's 
Microdrive, designed for Spectrums, 
will not work on ZX81s or TS1000S 
without a special interface. Timex 
may offer an inexpensive ZX/TS- 
compatible disk drive, but not in 
the immediate future.—AZ 


Freak your system out without 
using POKE or USR. Run this pro¬ 
gram, then try to edit a line. 

Even CLEAR won't return it to 
normal. 

10 GOSUB 20 
20 GOTO 10 

The system does not catch the re¬ 
sulting stack error in time. 

Dean A. Cuadra, Los Angeles, CA 


I want to mention the fine 
service I received from People's 
Computer Supply. On Mar. 16, I or¬ 
dered a Memotech Centronics Printer 
Interface from them. On Mar. 28 I 
had the unit—not much more than 
travel time both ways. In addition 
to the fast service, they notified 
me that the price went down and 
reduced my charge. Service like 
this deserves praise. 

In contrast, CAI Instruments 
has yet to provide a Stringy Floppy 
and CAI/O board ordered Jan. 31 (8 
1/2 weeks ago as I write). When I 
call, I am told they'll go out 
"this week" or "tomorrow." Besides 
the slow service, CAI charges $10 
more than its current ad states. 

James R. Shoaf III, Santa Clara, CA 


Thanks to Jon Harder for his 
low-cost, low-tech approach to 
solving the ZX/TS desktop tangle 
problem (Mar.83). Two suggestions 
for lowering cost and improving 
results: First, ask for a correct 

sized scrap of finish-quality ply¬ 
wood at the lumber yard. Interior/ 
furniture grade plywood looks good 
and won't cup (warp across the 
grain). I got a piece of white 


pine ply (10x16x3/4") for $1.25. 

Second, for the switched ex¬ 
tension cord, get a feed-through 
switch ($.99-1.25) at the hardware 
store, then dig up a spare exten¬ 
sion cord. Put the switch exactly 
where you want it for easy reach. 
You can easily install one in five 
minutes with just a jackknife and a 
screwdriver. 

Bob Rettew, Derry, NH 


I bought a Byte-Back M-16 RAM 
module kit, which I highly recom¬ 
mend, in April 1982. I had no 
problem with assembly and operation 
until I bought a Timex tape. It 
wouldn't load. After lots of frus¬ 
tration, I called Byte-Back. They 
asked if the program contained any 
machine code (it did), then told me 
I needed a modification. 

They told me to cut the trace 
from IC U3 pin 9 to IC U14 pin 9, 
then tie pins 9 and 10 of IC U14 
together. Since the mod I've had 
no more loading problems. 

Like many others, I have some 
problem with RAM crashes. While 
troubleshooting my RAM for the 
loading problem, I noticed that 
touching my logic probe to pin 21A 
on the RAM edge connector caused 
the RAM to lose its contents. The 
schematic showed that pin 21A is a 
not RESET and my probe showed it 
was floating. So I tied pin 21A 
high using a 10K resistor to the 5V 
supply. This eliminated about 95% 
of my RAM crash problems. 

Sidney E. Parker, Newark, CA 


I found an ad in January's 
Creative Computing for Arkay En¬ 
gravers, 2073 Newbridge Rd., Bell- 
more, NY 11710, 516/781-9859, for 
keytops. I have never done busi¬ 
ness with them. 

Steven Rohall, Pittsburgh, PA 

Contact Ken Kaplan of Arkay for 
info on ZX/TS keytops.—AZ 


13 







PERSONAL NET WORTH—8K/16K 


Do you wonder if you will ever 
"get ahead" financially? Personal 
Net Worth keeps track of your per¬ 
sonal finances and figures your 
current net worth. 

It calculates, stores and plots 
your net worth for 14 years. The 
table option shows yearly total 
assets, liabilities and net worth. 

Once the array is full, the 
program lets you add years by de¬ 
leting the oldest year. With this 
routine, you don't need to reenter 
data in new array locations. 

Lines 4000 on tell you how to 
initialize the program. DIMension 
each variable in line 4010 by pre¬ 
ceding it with DIM and pressing 
ENTER. For lines 4020 on precede 
each variable with LET and enclose 
words in quotes. For example, LET 
N$="NET WORTH" (ENTER). In line 
4030, LET A(l,l) equal the 4-digit 
year you want to start with, no 
quotes necessary. (Delete lines 
4000-4060 after initializing to 
save memory.—AZ) 

To start, GOTO 10. Pick func¬ 
tion 3 to SAVE. After reloading, 
the program self-executes to reduce 
the risk of clearing data. After 
entering data, do not RUN or you 
lose all data entries including 
initialization. 

Lines 2080-2130 automatically 
scale the graph. If the current 
range of numbers doesn't fit your 
situation, change the values. 

To print the table out, change 
PRINT in lines 2390-2450 to LPRINT 
(or comparable printer command) and 
delete lines 2460, 2480, 2490 and 
2500. Line 2220 keeps the program 
from plotting a negative net worth. 

When you choose the table op¬ 
tion to display data, the program 
stops after two years. Press CONT 
and ENTER to proceed. 

Inverse graphics are: 

990 DATA ENTRY 2999 SAVE DATA 

1990 DISPLAY DATA 4000 INITIALIZE 









Russell Crum, Canton, MI 


14 



























































TS 1000™/ZX8r OWNERS 


• Improve programming and game playing, too! 

• Easy to install - no wiring or soldering required 

• Clear Vinyl with key-shaped openings and 
adhesive backing. 

TYPEX/81™ Keyboard 

$5.95 + $1.50 P&H □□□□□□□□□□ 

_ [□□□□□□□□□□ 

Order by mail or phone. ^ 

216/234-2662 • VISA & MASTERCARD welcome. 

G ANH ART/E ARTHings 

115 N. Rocky River Dr.*Dept.XI 
Berea, OH 44017 


DEALER/DISTRIBUTOR 
INQUIRIES INVITED 



15 












































12 issues 
only* $29.95 
Save $5.45! 
Plus receive 
free 

y software 
\cassette! 


A new and unique magazine for the world’s 
most popular personal computer 


The best add-on 
value for your ZX81 or 
TIMEX SINCLAIR computer 


Now that you’ve got a TIMEX SINCLAIR 
computer make sure you get the new 
magazine that helps you to get the most 
out of it... TIMEX SINCLAIR USER! And 
take advantage of our special bonus of a 
free software cassette ($15.00 retail 
value) with each subscription. 

TIMEX SINCLAIR USER is published 
monthly. It keeps you totally up-to-date. 
It helps you make full use of the power 
of your computer. 


TIMEX SINCLAIR USER covers the full 
spectrum of user interests. Education. 
Business applications. Home manage¬ 
ment. Games and family entertainment. 
And TIMEX SINCLAIR USER does it in an 
easy-to-understand style that’s 
authoritative yet friendly. 

Each issue is packed with articles and 
information that help owners make use 
of the power of their computer. News 
about software releases. Reviews. Hard¬ 
ware developments. Reader question 
and answer column. Eight pages of pro¬ 
gram listings in every issue. New and 
unique user applications. How to pro¬ 
gram. Interviews. Special money saving 
offers to readers. 

In fact, all the latest ideas and informa¬ 
tion to ensure that new owners and ex¬ 
pert users never tire of their computer. 


FREE BONUS WITH YOUR 
SUBSCRIPTION 


Packrabbit" 
Retail value 
$15.00 


For any age 
or experience 

Remember: the TS1000 was designed 
precisely for you. Whatever your age and 
experience in computers, TIMEX 
SINCLAIR USER can help you use the 
power of your computer. 


SUBSCRIBE NOW and take advantage 
of our special offer. Only*$29.95 for 12 
monthly issues postage paid. This 
represents a $6.00 saving over regular 
newstand prices. And remember, you 
receive a FREE BONUS with every 
subscription, a “Packrabbit” software 
cassette ($15.00 retail value). 


To order call 


800 - 543-3000 


Mail to TIMEX SINCLAIR USER, 49 La Salle Avenue, Buffalo, New York, 14217 


TIMEX SINCLAIR 1000: the price and 
technology breakthrough that finally 
made computers affordable. 

TIMEX SINCLAIR USER: the magazine 
that helps you use the power of this 
revolutionary computer. 


Name 


Address 
City_ 


State 


( ) Check 


( ) Money order. Or charge to 


Number 


( ) Yes, I want to subscribe to TIMEX 
SINCLAIR USER at the special rate of $29.95 
for 12 issues delivered to my door. In addition I 
understand I will receive the FREE software 
cassette with my first issue. 


Use the POWER within your reach! 


TS1000 

ZX81 


A good reason to order now! Receive a 
software program cassette of an ex¬ 
citing, new arcade game! “Packrabbit” 
is a regular $15.00 retail value. Free with 
subscriptions for a limited time only. 


Ask for Operator 243. In Canada call 
(513) 729-4300 and ask for Operator 243. 

These numbers are for orders only. Have 
your VISA, Mastercard ready. 


U.S. dollars 


Expiry _ 

Signature. 


AD Code 
S5 











NO MORE BAD CASSETTE LOADS 
with 

THE Z-DUBBER 

The frustration of trying to load a cassette program into your Sinclair 
ZX80/81 or Timex 1000, is this what you really bought your computer 
for? Why put up with It? Now you don’t have to. The Z-Dubber is a 
small device which connects between your computer and cassette player, 
improving your loading ease 100%. 



The Z-Dubber also allows you to connect two tape recorders together, to 
create perfect duplicates of your favorite cassette programs. The Z-Dubber 
can be yours for $31.95 postage paid within the U.S., Canada & Mexico. 
Add $2.50 additional for other postal areas. Visa & Mastercard welcome. 


FOR CHARGE AND C.O.D. ORDERS 



1(800) 227-3000 TOLL FREE 


1(800) 792-0990 IN CALIFORNIA 


ASK FOR OPERATOR 225 



For additional information or service, call or write: 


BYTESIZE MICRO TECHNOLOGY 
FO BOX 21123 - DEPT. A - SEATTLE, WA 98111 
(206) 236-BYTE 


HARDWARE REVIEW 


Product: ZX81 Keyboard 

From: Memotech Corp. 

7550 West Yale Ave. 
Denver, CO 80227 
303/986-1516 

Price: $99.95 (assembled only) 

When UPS delivered my new key¬ 
board, I hastened to see what mar¬ 
vel Memotech developed this time. 

Inside I found a full-size key¬ 
board with legible, all-white ZX/TS 
legends on the keys. The keyboard 
duplicates Sinclair's keyboard, but 
with full-travel keys and an extra 
shift key in the top right corner. 

It took longer to unpack the 
keyboard than to connect it to the 
computer. The keyboard attaches to 
your edge connector via an inter¬ 
face in Memotech's standard product 
housing. The "black box" sand¬ 
wiches between their other prod¬ 
ucts. Besides attractive to the 
eye, the functional metallic blue 


board is immune to the "wobble 
and die" syndrome common to most 
products connecting by the edge 
connector. The 12-inch flat cable 
between the keyboard and interface 
gives the keyboard free movement. 

All Memotech products are FCC- 
approved so that no unwanted RF 
emissions bother your TV or stereo. 
I recommend it to anyone who values 
his or her system enough to buy 
only the best. 

Jeff Pack, Seattle, WA 

At SYNTAX we also enjoy our Memo¬ 
tech keyboard. I like the shift 
key in the upper right corner—I 
can delete or move the cursor with 
just one hand. Contrary to Jeff's 
report, we find the interference 
level on TVs high. We use a moni¬ 
tor with little trouble. Also we 
find another change from the origi¬ 
nal ZX/TS keyboard—the legends are 
located a little differently. Each 
key performs the same functions, 
but the command appearing over a 
key on the original now appears on 
the key and below the other leg¬ 
ends. Those below keys are on the 
key fronts. So you need to light 
your keyboard from the front so you 
can read the keys. 

Our keyboard came with a 
sticky row of keys on the right 
side that we fixed by sliding the 
circuit board left. Now the keys 
operate smoothly. The connecting 
cable is a little short, so you 
must put your computer to the left 
of the keyboard. 

Said Fateh of Memotech tells 
us that Bill Wright of Sinclair 
Users' Network (SUN) called about 
the TV interference. Bill sug¬ 
gested replacing the computer's 
video cable with a good quality 
coax cable, preferably gold-plated 
at both ends. Memotech tested this 
solution with a Radio Shack 59/U 
(#15-1535) coax cable, not gold- 
plated, $3.99. Said says it clears 
up interference caused by any add¬ 
on. We have not tested it.—AZ 


17 

















SAVE ON SAVE AND LOAD 

Save about 15 seconds when you 
save or load. Add this code some¬ 
where in your program (here shown 
at end) to auto-save: 


SAVE with RUN 9995. Each SCROLL 
execution collapses the bottom 
line? 22 rounds collapse the whole 
display except last two edit lines. 
In SLOW the computer takes a while 
to unscroll to full screen. 

Bob Berch, Rochester, NY 

VENDOR REPORT AND NOTES 

Has Frog Software, a recent SYNTAX 
and SQ advertiser, croaked? We've 
tried to get them on the phone for 
over two weeks? now it's discon¬ 
nected. If you have unfinished 
business with them, let us know. 

Gwen Marsh of Brainchild reports 
they are back-ordered on Kolor- 
works. If you are waiting on an 
unfilled order, call Brainchild 
collect at 414/691-3903. 

Memotech and its distributors have 
advertised RS232 interfaces for 
several -months, but no one has any 
in stock. We suggest you check 
periodically with Memotech at 800- 
662-0949. They tell us to expect 
interfaces in the next month. 

According to a voice on Timex's 800 
line, the first issue of Ramblings, 
the Timex newsletter, is out. You 
should get a free copy if you sent 
in a warranty card to Timex. 
Questions? Call 800-24-TIMEX. 

Call Dilithium Press, Beaverton, 

OR, at 800/547-1842 for orders and 
info. Their latest. Using and 
Programming the TS Computer , is due 
out in June at $9.95. Someone an¬ 
swers tech questions at that number 
on Tuesdays and Thursdays. 


TIMEX 1000 COMPUTER 
* OWNERS * 

IF YOU OWN A 16K RAM MODULE 
THEN YOU NEED A “CRASH GUARD” 
TO HELP SOLVE YOUR WOBBLE AND 
CRASH PROBLEMS 

* NO DANGER BUMPING THE MODULE 

* PROVIDES A SOLID WORK BASE 

* MADE OF HEAVY GUAGE ACRYLIC 


$19.95 

ADD 

$1.50 S. & H. 


VISA OR MASTER CARD ACCEPTED 

EXPENSE CUTTERS PRODUCTS, INC. 
P.O. BOX 9543 RAYTOWN, MO 64133 
(816) 353-1690 

10 DAY TRIAL PERIOD 
“SATISFACTION GUARANTEED" 



TYPIT 


Does your word 
processor have these 
features? 

Our TYPIT program 
does! 

Character insert/delete 
with or without line 
wrap-around options, 
Line insert/delete, Move 
blocks of text, Scroll 
up/down, Page forward 
or back, Clear to end of 
Line/page, Search for 
text, Cursor control 
including home-up, 
printer support. 

TYPIT is available on 
York-10 cass. 



n n 


N w 


HD IIH 


II II 


a ii 


i" in»■ 


■ N 


Should you tire of word 
processing, relax behind 
a game of BIOCAL’s 
Cribbage...our other 
programs include 
Checkbook, The Stock 
Exchange Game, Klingon 
Wars, and Biorhythm. 
Programs are $10 on 
cassette or $15 on 
stringy floppy. For credit 
card orders, call us: 

Toll Free 
(800) 237-8400 
Ext. 70 

Write for FREE CATALOG 
or call (415) 892-1747 
to Order by Mail. 

Send check or money- 
order to: 

BIOCAL 

SOFTWARE 

340 Cypress Drive 
Fairfax, CA 94930 


18 















i/noo'S 

i tut I II i 

Creations Inc. 


Account 


‘TOUCH-A-MATIC’ 


Your own PERSONAL OR SMALL BUSINESS ac¬ 
counting system. Contains refinements not usually 
found in this type of program. “200 Transaction file” 
can be SEARCHED, PRINTED or DISPLAYED. This 
program has been throughly tested, and improved 
through extensive use. m 4 Anc 

ORDER No. 03-1022 $1995 


$995 


EZ-Loader 


AUTOFILE 


An ELECTRONIC FILING SYSTEM that can be used 
for ANY type of data. Set up your own DATA-BASES 
with this easy to use, menu-driven program with 
AUTO-SEARCH facility. * 4 ftcn 

ORDER No. 03-1021 *19 5U 


BREAKOUT 


Fast MACHINE CODE arcade-type game. If you 
haven't tried THIS version, you haven’t played 
“BREAKOUF on the ZX81/TS1000. * A 

ORDER No. 03-4028 $1495 


POWER 
AT YOUR 
FINGER TIPS! 

ORDER No. 01-0007 

KOPAICS “TOUCH-A-MATIC” gives you the power to 
type more accurately and faster. It requires NO 
WIRES, NO SOLDERING. It’s as easy as removing 
the adhesive backing and pressing it into position. 


LOADS & SAVES 16 K file in 26 seconds instead of 
7 minutes! Cleans up signal for a cleaner load. 

• STRONGER, SHARPER DIGITAL SIGNAL 

• CLEANER, FILTERED POWER • ENCODES YOUR 
PROGRAM AND/OR DATE • Save time/Save energy 

• Baud rate increases from 250 to over 4000 bps. A 

must for all ZX81/TS1000 owners. *onnc 

ORDER No.04-1010 $OSf 3a 


COMPOSER 


Enables you to play any tune through your T.V. 
speaker, your cassette recorder or through an A.M. 
radio. With ‘COMPOSER’ you can control the dura¬ 
tion of each note. And you can save your song on 

ORDER No. 03-3012 $1995 


G R A FIX 


Draw and store complex images. Permits you to 
create, mix, and save your own screen artwork. You 
can mix graphics created with GRAFIX into another 
program. By itself or on tape. This program is a 
“must” for the CREATIVE PROGRAMMER.^ Mn - 
ORDER No. 03-6005 $1495 


Z-99™ (Improved ‘M’-Coder) 


Now you can write MACHINE CODE PROGRAMS on 
your ZX81/TS1000 with Z-99. The best true MA¬ 
CHINE CODE COMPILER for the ZX81/TS1000 com¬ 
puter. Simply write your new program in BASIC (or 
load an EXISTING PROGRAM), press a key and Z-99 
will automatically compile it into MACHINE CODE for 
you. Give all your programs that SUPER—FAST pro¬ 
fessional look. Order Z-99 NOW to revolutionize your 
programming. Once you try Z-99 you’ll never write 
basic programs again! 

ORDER No. 03-5271 $ 1095 


ORDER FORM 

TO AVOID DELAY PRINT CLEARLY 
STOCK NUMBER AND DESCRIPTION 


Dealer Inquiries Invited 


MAIL THIS FORM WITH PAYMENT TO: 


KOPAK Creations Inc. 
119 Peter St. 

Union City, NJ 07087 
(201) 864-4410 


HOW 



NAME_ 

ADDRESS 

CITY 


STATE 


PUCKMAN 


up to $9.99 to $14.99 add$2.00 
from $15.00 to $19.99 add $2.50 
from $20.00 to $24.99 add $2.85 


from $25.00 to $29.99 add $3.45 
from $30.00 to $39.99 add $3.70 
from $40.00 to $49.99 add $3.95 
over $50.00 add $4.25 



Superb fast moving MACHINE-CODE fun. Have an 
exciting time playing this EXCELLENT version of the 
popular arcade game. *4 j aK 

ORDER No. 03-4027 $1495 


CHARGE 

visa[ 

MASTER I—I 


1 1 Sign 


INTERBANK NO- 


Total amount 
enclosed or to 
be charged to 
my credit card 


EXR DATE! 


- MO YEAR 

In Canada call Datronics (416) 496-2243 















R.I.S.T. Inc. Announces 

A FREE Subscription To Syntax Quarterly 

Purchase A Parrot Speech Synthesizer You Will Receive: 

A Subscription To Syntax Quarterly "$15.00 VALUE FREE" 
Exclusive Phrase Finder Program "$5.00 VALUE FREE" 
Speech Synthesis Instruction Manual "$10.00 VALUE FREE" 
ACT IMOW And Also Receive A Talking Casino Game Cartridge 
"$15.00 VALUE FREE" 

WHY YOU SHOULD READ SQ 

SQ brings you professionally written articles and reviews ' 
to keep you attuned to the finest products as well as the best 
bargains for your dollar. 

NOW, through this package deal brought to you by i 
‘.S.T. Inc. and SQ, speech synthesis has become affor¬ 


dable. Man's most powerful means of communication are 
yours. 

HOW YOU CAN MAKE YOUR COMPUTER TALK. 

The PARROT newly introduced by R.I.S.T., gives the 
power of speech to Timex/Sinclair Computers. This simple 
to use plug-in speech module is capable of generating all the 
sounds in the English language. The combination of these 
sounds, in the order of your choice, will generate an 
unlimited vocabulary of words, phrases, and sentences as 
well as an array of sound effects. Piggy-back 

expandability allows other modules (eg. memory) to be 
operating with the Parrot simultaneously. 

Paul Donnelly had this to say in the April issue of Syntax: 

"Documentation is professional..." 

"Overall, R.I.S.T.'s Parrot is an excellent unit and per¬ 
forms up to and behond my expectations." 

Many different applications can be shared among this 
common software interface: GAME APPLICATION pro¬ 
grams for fierce competition between you and your com¬ 
puter can now be guided and accentuated with speech. 
HOUSEHOLD APPLICATIONS: Relieve the pressure of 
"one eye on the clock". Program your computer to give you 
a call when your on a tight schedule and your time in the 
shower is running out; call you when your roast is ready; tell 
you when your favorite TV show is about to come on. The 
possibilities are endless in solving every day problems. 
EDUCATIONAL PROGRAMS: Generate a program for 
your child, bringing the overwhelming simplicity of listening 
and learning. YOU WILL ALSO RECEIVE: 

An exclusive phrase finder program-FREE. This pro¬ 
gram enables you to select, string together and pronounce 
your desired phrases. It makes editing of speech easy. 

A 40 page speech synthesis manual-FREE. 

*See how certain sounds can be used to give your computer 
an unlimited vocabulary. 

ACT NOW: receive a Talking Poker Game-FREE. 


‘Mrrrcf 



hear the power 


SAVE $45.00 

Send To: R.I.S.T. Inc. 
Dept. 2-5 (Fomerly 
Voicetech) 

P.O. Box 499, Ft. 
Hamilton Station 

Brooklyn, N.Y. 
11209 - (212) 259-4934 


Please send me #_ 

Parrot(s) Speech Syn¬ 
thesizers for my □ 
ZX80 □ ZX81 □ 
TS1000 at $89.95 ea. plus 
$4.00 sh/hd. I will receive a 
FREE subscription to Syn¬ 
tax Quarterly along with the 
exclusive phrase finder pro¬ 
gram cassette, the 40 page 
instruction manual and the 
talking poker game car¬ 
tridge; a $45.00 savings. 

ORDER NOW 
LIMITED TIME OFFER 


RUNNING MC IN A STRING VARIABLE 

You can place and execute ma¬ 
chine code (MC) in three places: 

REM line, memory reserved above 
RAMTOP, and a string. 

Using a REM line lets you SAVE 
the code, but listing it can upset 
the system as it tries to interpret 
values not designed for display. 

Using memory above RAMTOP elim¬ 
inates the listing problem, but the 
code won't SAVE. You must reserve 
the memory and reinstitute the MC 
each time you power up. 

Using a string to store the 
code eliminates these disadvan¬ 
tages. But take care not to des¬ 
troy the string variable. Also, 
unlike the other methods, the 
code's start address does not re¬ 
main constant; the system moves 
variables as needed to accommodate 
program and display space needs. 

So don't use a string to execute MC 
if during execution, the space used 
by the programs or display changes. 


Finding the string to execute 
it is no problem if the string is 
the first variable assignment in 
the program. The first assigned 
variable is always the first vari¬ 
able in the variable storage area, 
no matter where that area may be. 

To find that area, VARS, enter: 

PEEK 164 00+PEEK 16401*256 
The string's contents begin three 
bytes beyond. 

This program assigns Z$, which 
holds the MC hex representation. 
Here Z$ holds two concatenated 
routines. The first 54 characters 
represent the 27 decimal codes for 
renumber. The rest is Syntactic 
Sum. Line 2 finds VARS+3. Lines 
3-6 PEEK the contents of line 1, 
convert the character code to 
decimal, and POKE it into the space 
the Z$ assignment set aside in 
VARS. The decimal code occupies 
only half the space of Z$—check by 
PRINT Z$ after running—but Z$'s 
length doesn't change. 

RUN in FAST. It stops at line 
7. GOTO 9990 to renumber the pro¬ 
gram lines by 10. It doesn't re¬ 
number GOTOs and GOSUBs. (After 
renumber, Syntactic Sum is 20570.) 

Renumbering does not alter pro¬ 
gram space because all line numbers 
are held in two bytes. 

If after running the program 
you delete lines 1-7, remember that 
RUN will wipe out the code. Ob¬ 
viously, do not reassign Z$. 

Rolf Miller, Ventura, CA 




20 
























TS1000 Support! 

Software/Hardware/Books from GLSDSTOflE-^-ELECTROniCS 


Wfii 

Wrw0*m 

f 

I 


•m f mi 

A 

i J 

WL M 

A 


^Ats'ofe 


Software 


ZX Forth 


A complete implementation of the FORTH language for the 
ZX81 andTSIOOO computer. 

FORTH’s most distinctive feature is its flexibility. The basic 
unit is the word — the programmer uses existing words to de¬ 
fine his own which can then be used in further definitions. 
FORTH is a compiled language so programs run very fast 
(typically five times faster than BASIC). 

ZX-FORTH is supplied on cassette and is accompanied by 
extensive documentation: 

56-page Users Manual 8-page Editor Manual 

Z43 $29.95 


Teach your children programming skills through a computer 
graphics language. It’s easy and fun to use! Included with 
your program is a comprehensive guide. (Tiny Logo is a sub¬ 
set of the popular MIT Logo) $ 19.95 


KEYBOARD 

with metal case 

A full -sized professional keyboard for the ZX81 
Features 47 keys and a full-sized space bar. Con¬ 
nects to the ZX81 with no soldering required, via a 
plug-in flexible connector. You can purchase the 
keyboard only, or the optional metal case that holds 
both keyboard and ZX81. Expansion devices (i.e 
RAM packs, etc) connect to the ZX81 edge-connec¬ 
tor which extends from the rear of the cabinet. 

A professional keyboard makes program entry 
easier and less error-prone. 

Keyboard K70 $79.95 

Metal Case for keyboard 

and ZX81 E70 $25.00 

GLADSTONE 64K RAM 


Fastload allows you to save and load 
programs at rates up to 6 times faster than 
normal. Change your old programs into new 
FASTLOAD programs and no extra equipment 
is needed. 7 ri ciqqc 


Travel the world with your T/S1000 - ZX81 Computer. An¬ 
swer the 12 riddles and WIN! ZX48 $19.95 


The Complete ZX81 
and TS1000 Library! 


Machine Code Monitor and Disassembler 

ZXBUG is a powerful tool for machine language program¬ 
ming. It is 4K long and uses memory from 71EO to the top 
memory. ZX BUG works in hexadecimal (base 16), not deci¬ 
mal, so all addresses are a maximum of 4 Hex bits long. Pro¬ 
vides a total of 28 commands. 7/11 a qc 


The Complete ZX81 Basic Course . 

Basic Course Cassettes (2) . 

Getting Acquainted with your ZX81 . 

ZX81 Pocket Book . 

Making the Most of Your ZX81 . 

Computer for Kids, ZX81 Edition . 

Explorers Guide to the ZX81 . 

ZX81 Companion . 

49 Exploding Games for the Zx81 . 

Not Only 30 Programs for ZX81 :1K ... 

Machine Language Made Simple . 

Mastering Machine Code on your ZX81 

ZX81 Rom Disassembly: Part A . 

ZX81 Rom Disassembly: Part B . 

Understanding your ZX81 ROM . 


ZX Assembler 


This Machine Code program occupies 7K of memory and lo¬ 
cates itself at the top of memory. The program is a full Editor/ 
Assembler and Monitor. Labels may be used instead of any 
string. The features include Line Insertion/Delete, Insert 
Characters, Auto Repeat on all keys. The Monitor has facili¬ 
ties to inspect memory, registers and run machine code pro¬ 
grams. 


Expands the capacity of the T/S 1000 or ZX81 to its 
maximum. User transparent. G64 $ 149.95 

Cramic-81 

CMOS 16K Memory 

Cramic-81 is a 16K RAM pack using CMOS technology for 
permanent data retention. Data can be stored almost indefi¬ 
nitely and loaded almost instantly with virtually zero chance 
of error. An ordinary Rampack can also be connected simul¬ 
taneously. The two RAM units then occupy the same mem¬ 
ory area but either can be selected. Two separate programs 
can actually run alternately. ci ? $17Q 


Z40 $14.95 --—“ 

ORDER TOLL FREE 
800-833-8400 

In N.Y. (716) 874-5510 

In Canada 1-800-268-3640 Monday-Friday 9:00 am. -1:00 am E.S.T 


Gtaasront 

1585 Kenmore Ave. 


ELECTROMG 

Buffalo N.Y. 14217 


Write for Gladstone’s 

FREE CATALOG 

Circle reader service number or write 
(no phone requests please!) 

New from Gladstone Electronics! Our 
ZX81/TS1000 catalog will take you 
where no one has dared go before.! 

You will view the widest selection of up- 
to-date software, books and hardware 
add-ons available to get the most from 
your personal computer. This exciting 
new 34 page color catalog lists arcade, 
fantasy and family games, business 
and educational programs; books for 
1 beginners as well as experienced 

I users; hardware add-ons and other 

& peripherals for use with ZX81 /TS1000 

m Home Computer! Use the convenient 
coupon and send for your FREE 
catalog TODAY! 


CHARGE TO: 

|□ VISA □MASTERCARD 


Quantityl Price I Total 


ADDRESS_ ^ 

SHIPPING 

CITY: STATE 7IP _ TOTAL 

To: Gladstone Electronics, 1585 Kenmore Ave., Buffalo N.Y. 14217 


In Canada: 1736 Avenue Rd., Toronto, Ontario M5M 3Y7 


CANADA: PRICES MAY VARY 




















ZX/TS USERS 1 GROUPS 


To list your group or to find a 
local one, call or write SYNTAX. 

Columbus, OH: Gary Solomon, 1653 
Brice Rd., Reynoldsburg, OH 43068, 
614/861-3600. 

Guam: Sinclair/Timex Users Club of 

Guam, Jerry N. Lorell, pres., POB 
4011, Agana, Guam 96910. 

Central Florida: Sinclair Computer 
Club of Central Florida, Darrell 
Stec, 650 N. Orange Ave., #428, 
Orlando, FL 32801, 422-5131 x428 
eves., or Dan Wolfe, 5058 Nadine 
Dr., Orlando, 277-2905 eves. 

Philadelphia, PA: Bell Telephone 
Computer Club, Orvis Kline, 4th 
FI., 1 Parkway, Phila., PA 19102, 
215/466-4291 days, 876-0413 eves. 

Tucson, AZ: Timex/Sinclair Users 
Group, POB 41795, Tucson, AZ 85717. 

CLASSIFIED ADS: Reach almost 9,000 
users for $9/line. Send ad 35 char, 
/line with ck. to arrive by 15th. 
Inc. tel. #, whether or not it's in 
ad. SYNTAX,BX 457,Harvard, MA 01451 

PROWRITER PRINTERS: $399.95 ?? Yep! 
Get free specs w/sample output now. 
Tom Woods Box 64 Jefferson,NH 03583 

NORDACK SOFTWARE-QUALITY ZX/TS 16K 
Games-BLACKJK,CRAPS,HANGMAN $4-3/10 
LIFE-An exciting visual display !!! 
User sets scrn design and lets an 
amazing algorithm go the work MC.$8 
BARTENDER! Great at parties. Show 
Friends. Store,retrieve up to fifty 
drinks+ingredients. Nice display $8 
Statistics+ Business Programs-$8 EA 
REGRESSION- Forecasting -long term. 
EXPONENTIAL-Forecasting-short term. 
QUEUEING-Simulate waiting lines,etc 
BREAKEVEN-Make sales,cost decisions 
of business allocation problems. 
PLOTTER-PLOT data pts. Sets axes. 
!!!A11 progs documented fully !!!!! 
PO BOX 4009 SILVER SPRING,MD 20904 


***for TIMEX/SINCLAIR computers*** 
NEW ! " IN-LINE " LOAD MONITOR ": Load 
software like a pro! Guaranteed. 

Compact. Detailed instruct.-12.95 

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 RECORD ALBUM COLL -10.95 

Each program on cassette + manual. 
8KROM, 16KRAM. $1.50 S&H per order. 
$1 for cat. (Refunded with order.) 
N.J. 6% tax. WANTED: Retailers, Agent 
and Dealers. M.C.HOFFMAN CO., DEPT. 
SX4, PO BOX 117, OAKLAND, NJ 07436 

* * SALE ! - SALE! - SALE! - SALE! * * 

LABYRINTH OF OAZXL IS THE ULTIMATE 
Dungeon Game For 16K ZX81/TS1000!!! 
Treasure! Fight 50 Kinds Of Beasts 
multilevel Graphics-Text Adventure! 
Actually draws Rooms And Halls!WOW! 
Tape $10: JLK SOFTWARE. 6 DUFFERIN 
PL, ST. JOHN'S NFLD. CANADA AlA 2V1 

******M-z SYSTEMS SOFTWARE****** 

If You Own The Z-81 or T-1000 
You Must Own The M-Z LEDGER And The 
M-Z LIST To Get The Most 
From Your Computer. Only $21.95 

Each Or For More Information 
Send SASE To M-Z SYSTEMS, 1003 
SOUTHCLIFF, PORTLAND, TX 78374. 

FREE Program listing & NEW catalog 
loaded with software/hardware,books 
etc. Send two 20 stamps to; 

JPR SOFTWARE,BOX 4155,WINTER PARK, 
FL. 32793. Rush... LIMITED OFFER. 

***** METAGRAPHICS ***** 
USE THE FULL GRAPHICS POTENTIAL OF 
Your ZX81/TS1000 (16K RAM). 2048 
CHARACTERS !! BASIC + M/C Gives You 
Total Artistic Control. Send $12.95 
******** CALLIOPE SOFTWARE ******** 
4130 COE DR. NE, ALBUO., NM 87110 

******* Mother's Day Gift ********* 
WORKING MOTHER'S DILEMMA . tm Four 2K 
Games. $14.95 (6% tax CA res.) FREE 
Color Catalog. 2-BIT SOFTWARE, SY4, 
P.O. Box 2036, Del Mar, CA 92014 
*** Charge Orders (619)481-3629 *** 


22 









ANIMATED FUN*CAVES OF ZULU, CALVIN 
Glomb's Exciting Animated Adventure 
Is Now Available For 16K Timex/Sinc 
Only 19.95 + 2.00 S/H VISA/MC OK 
STUART SOFTWARE 25381-G Alicia #316 
LAGUNA HILLS CA 92653 (714)855-4753 

PICKLE MAN & MS PICKLE MAN!Eat dots 
& Pickle Monster! Both req IK only! 
List $2(for both!) PANERO SOFTWARE 
3309 Lewis, Long Beach f Ca. 90807 

OUR POLICY ON CONTRIBUTCI^^RIAL^™™™" 

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. 


**** TECHNICAL APPLICATIONS **** 
Software for electronic CAD and 
formulas. All in BASIC, on tape, 
with comprehensive instructions. 
Send SASE for a list of programs 
and prices to: Softec, P.O. Box 
432, Fairport, New York 14450 


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 

IN-LINE LOAD MONITOR : Load 

software like a pro!-12.95 

IN-LINE VOLTAGE DROPPER : Computer 
and Ram pack will run cooler with 

fewer system crashes-15.95 

XN-LINE LOAD FILTER : Cuts hi-pitch 

noise when loading software-12.95 

XN-LINE SAVE FILTER : Cuts hi-pitch 

noise when saving or duplic-12.95 

PLASTIC RAM CLIP : End system crash 

caused by loose Ram pack-2.00 

£L IG1 T GUIDER: Clear vinyl keyboard 

overlay with finger holes-6.95 

SPIRAL W RAP : Organize your computer 

cables. 24 inch length-2.00 

N.J. 6% tax. $1.50 S&H per order! 

M.C.HOFFMAN CO., DEPT.SX5 

P.O. Box 117, OAKLAND, N.J. 07436 


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. 


YES! Please send me 12 issues of SYNTAX for $29. 5 . 83 

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

SYNTAX ZX80, INC. O VISA □ Carte Blanche account 

account number_ 


exp. date. 


. bank number (MC only) 


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 


signature___ 

Name__Title_ 

Organization_ 

Address__ 

cit y-State_Zip 

Day PhoneJ-)_Evening Phone J_) 


I own a □ Sinclair ZX80 □ Sinclair ZX81 

□ TS1000 


Telephone orders call 

617-456-3661 


23 










ZX PRINTER PAPER: Your order ships 
same day. Super quality, exact size 
+ save! 3-pack/$12ppd Can:U$14? E. 
Alvarez PO Box 1025,Oviedo FL 32765 

///////// keycap g raph i c s. ///////// 

DRY-TRANSFERS That Give Your 1/2" 
Keycaps Class: Blk. & Red: $7. DAY, 
790 E. BIG BEAVER, TROY, MI. 48084 

======== COTTAGE TECHNOLOGY ======= 

ACZ GENERAL LEDGER -Computerize your 
small business accounting. $30.95 

REVERSE VIDEO KIT-Display white 
letters on a dark screen. $10.95 

Send a SASE for catalog. 

COTTAGE TECHNOLOGY 5720 W. Little 
York, Suite 178, Houston TX 77091 

INTEGRATED DATA SYSTEMS 
11 Brighton Av Toronto Ont M4M 1P3 
16K $51.12, extra 16K $43.84, Kayde 
Graphics bd $54.80, ZON-81 $49.28, 
Graphicomp educational $11.92 ea, 
P&H~$1.50,VISA. 300 item Free list 

PILOTS. "FLIGHT PLANNER" $11.95 + 
$1.50 P&H. provides Fuel, Heading, 
Distance & Time. "Weight & Balance" 
$5.95 + 1.50 P&H. JM SOFTWARE 1852 
APPLEFORD ST.,OTTAWA, ONT.K1J 6T4 

SEND SASE FOR SAMPLE NEWSLETTER 
Cent.PA. Users Group.c/o W. Russell 
RDl BX539 CENTRE HALL, PA 16828 


Bolton Road, Harvard, Mass. 01451 


Tl-E 

H\R\ARD 

GROCP 



z 


MAZOGS-MOTHERSHIP-KRAZY KONG-QSAVE 
Memopak 64K-32K-16K-Keyboards-ZXAD 
Free Catalog! Subscriber Discounts 
"Z-WEST" PO BOX 2411,VISTA, CA. 

2 Sample programs on cassette. 
$2.00 Plus SASE. Programs, 

3763 W. Crocus Dr. Phx, AZ 85023 


** ADD MEMORY THAT WON'T FORGET! ** 
* KIT $31:90 SASE details: HUNTER * 
*1630 Forest Hills Okemos MI 48864* 


****** TREK TRIVIA ****** 
EXCITING 16K TREK LORE TEST TWO 
Sided Tape: Side 1 Multiple Choice 
Direct Answer On Flip Side. 

Send $12.95 CK/MO To:F & J SOFTWARE 
P.0,BOX 124 GREEN VILLAGE,N.J.07935 


Do LIST, SAVE, mods, backups. Tape 
for 8K ROM, 16K RAM. Life-Guar. New 
low price $9.95,ppd. N.J. Gipson, 

43 Imperial R.D.#6, Coates,PA 19320 


TRY WINKY BOARD II AT NO RISK! Copy 
ANY ZX/TS cassette, make LOADS easy 
$24, $18 kit PPD. If not pleased in 
10 days return for fast refund. Our 
KEY CASSETTE LOADS & merges many 
programs into one. SAVES ANY ZX/TS 
cassette.$10 PPD. G. Russell, RDll 
Box 539, Centre Hall, PA 16828 


24 


U.S. Postage 
PAID 

Harvard, MA 
Permit No.8 
01451 

f 


First Class