OOOOThe Boston Computer Society
SINCLAIR-TIMEX USER GROUP NEWSLETTER
Volume 3 Issue 3
POLYGONS
by John Kemeny
One of the best features of the
T/S 2068 computer is its ability
to create and display high
resolution graphics. There are
commands in T8 BASIC to PLOT
points, DRAW lines, and even
make CIRCLES and arcs. This
article will present subroutines
to draw equalateral trianges,
squares, penta-hexa-hepta- octa-
nona-deca- and other polygons.
Polygon shapes have equal sides
and equal angles. In addition,
we hope to demonstate in this
article something about
developing programs and making
them more efficient.
Let's start with the inputs (see
figure 1). We need to know the
coordinates for the center, 0,
and the radius, 0A.
10 INPUT "CENTER’S
COORDINATES"’ X, Y
20 INPUT " RAD I US "’R
The x-coordinate should be
between 0 and 255, and the y
between 0 and 175. Also, the
radius should be small enough so
that the polygon won't go off
the screen, i.e., we won't do
what's known as "clipping." To
enforce our "shoulds" we can add
the following linet
25 IF X-RCO OR X+R>255 OR Y-RCO
OR Y+R>175 THEN SOTO 10
We also need to know the number
of sides.
POLYGONS page 6
March 1964
FEBRUARY MTG
M I GHL X GHTS
With Sue at home in Waterbury
recuperating from her automobile
accident, the February meeting
was chaired by John Kemeny. He
spoke briefly about the propsed
new library policy, asked for
volunteers, told us about a
machine code newsletter in
Albany NY, and plugged the March
meeting of our machine language
group.
The group’s library is now being
kept at the BC8 office (1 Center
Plaza, Boston). It will no
longer be brought to meetings
and, if we can get a volunteer
to be the 1 ibrarlan, things can
be checked out from there one or
two nights a month. As always
the group needs volunteers for
various jobs. John is organizing
a project to index all the
exchange newsletters we’ve
received, and we need volunteers
to help put out our own
newsletter.
The Albany machine language
group associated with Bonnie and
Clyde Software is publishing a
HIGHLIGHTS page 4
1 o REM
TAKE THE MONEY AND RUN
Timex was involved with Sinclair
computers -from the very
beginning. Early Sinclair
machines were manu-f actered to
Sinclair specs at a Timex
■factory in Scotland. One can
speculate that this close
association led to Timex ' s later
role in this story.
Now Timex has dropped out of the
personal computer market and it
makes me wonder about their
motivations from the very start.
There’s no evil in a company
finding itself in financial
difficulties and having to close
a part of their business to save
the rest. But that’s only if
the company was parti ci pat i ng in
the market in good faith in the
first place. Texas Instruments
had to abandi on their home
computers for these reasons but,
even with all their mis-steps, I
believe they real ly wanted to
build great computers. That,
sadly, is not always the case.
Timex brought nothing to the
microcomputing community. They
never made any serious attempt
to promote the value of the
Sinclair products nor to support
the community of users that grew
around the machines. When there
was money to be made Timex
accepted it and when things got
rough they pulled out.
I am a capitalist by nature. I
have absolutely no objection to
one making money, lots of money.
But to make it fairly you should
produce a valuable commodity.
Make some good contribution to
the marketplace. I have no
inside information, but I feel
that Timex never had any
intention of adding something to
the home computer community.
They were in it to make a fast
buck. All they wanted to do was
take our money. That's not good
capitalism and I think it's no
coinci dence that Timex
ultimately f ai led. And perhaps
no surprise that the whole Timex
Corp is in trouble. As for me
I'm now giving serious thought
to ever again using other Timex
products. How can their actions
in computers not reflect on
their attitude about al 1 their
other customers and products.
I’m very di ssappoi nted with
T i-mex .
A Final Notes
The grape vine says that
Sinclair Research is on the
verge of signing a U.S.
distribution agreement for the
Quantum Leap computer with The
Betty Crocker Company.
A source in Sinclair is reported
to have said that, "this
agreement will pave the way for
the QL to be sold in thousands
of grocery stores and
supermarkets around the
country. "
OThe
O Boston
Q Computer
CT
This newsletter is produced to
inform group members of the
agenda and logistics of future
meetings, as well as to recap
and amplify the information
provided at the meetings. It
also provides a forum for
members and interested parties
to communicate what thay have
learned or developed relating to
Sinclair and Timex computing.
Meetings are open to the public
(non-member admission is *3) ;
however attendees are encouraged
to join the Boston Computer
Society (BCS) This newsletter
is free to members. Back issues
are one dollar each.
DIRECTIONS TO MEETING: The S-T
User Group meets in the Large
Science Auditiorium (Room 8/2/
009) of the Uni versi ty of
Massachusetts, Boston Harbor
Campus. It is located only 3
miles from downtown Boston and
easily accessible by public and
private transportation. From
the north or west, take the
Southeast Expressway to Exit 17.
Turn left onto Columbia Road.
Follow construction signs to get
to Morrissey Boulevard in the
direction of UMASS and the
Kennedy Library. Bear right on
traffic island, get in the right
two lanes, following UMass/
Boston signs. Turn left at the
light into Campus. From the
south, take Morrissey Boulevard
northward to the campus. On the
MBTA, take the Red Line (Ashmont
Train) to Columbia Station.
Transfer to the free University
shuttlebus in the T parking lot.
The Sinclair Timex User Group
Sue Mahoney
Di rector
c/o BCS Office
or 203-755-2699
Jack Hodgson
Publ i sher /Edi tor
P.0. Box 526
Cambridge, MA 02238
617-354-7899
John Kemeny
User Group Correspondent
284 Great Road, Apt. D5
Acton, MA 01720
Allan Cohen
Meeting Coordinator
617-961-3453
The Si ncl ai r Timex Newsletter is
publ i shed monthly by the
Sinclair Timex User Group of the
Boston Computer Society.
Membership in the BCS is «24 per
year which i ncl udes a
subscription to its magazine
"The Computer Update" and
subscription to two of its group
newsletters (such as this one) .
Advertising space is available
in this publ i cati on on a
limited, first come first served
basis. The rate is *60 per
quart page. At this time no
other * sizes are available.
For detailed rate and discount
information contact the
Advertising Manager or the
Pub 1 i sher .
HIGHLIGHTS continued
newsletter. Free sample copies
are avai lable if you send them a
card requesting it. Ron Barnard,
Bonnie and Clyde Software, 36
Tanglewood Rd. , Albany NY 12205.
Henry April of EZ Key
demonstrated Upload 2000. This
is a program for the TS2068
which helps you to convert
TS 1 000 family programs to run on
the 2068. The main limitation
is that the source program must
be 100% in BASIC. Also some of
the TS1000 commands have to be
translated by hand after the
UPLOAD program has done most of
the transl ation. Henry also told
us that he will be distributing
the Compusa Disk Drive system
for the TS 1000/ 1500 computers.
EZ Key, Sui te 75, 711 Southern
Artery, Quincy, MA 02169.
Jack Hodgson took a couple of
quick show-of —hands surveys of
the audience. Of the 29 people
theres 9 owned TS2068's, 3 owned
TS1500’ s, and near 100% owned
TS1000/ZX81 ’ s. Roughly 80% had
been to 6 or more meetings, 20%
had been to less than 6 and
about 6—8 people were there for
the first time.
THE DEMISE OR-
T I MEX COMPUTER
CDRPORAT I OIM
(or What Is To Become Of The
Timex Sinclair Owners)
By Susan C.T. Mahoney, Director,
Sinclair Timex User Group
I was one of the first people to
learn that Timex was getting out
of the personal computer retail
market. A friend of mine, who
was working there called me to
tell me the news, just minutes
after she received the word
hersel f .
My first reaction was that it
was hard to believe, although
Timex had suffered some
setbacks, it was looking like
they might make it. Especially
with all the good reviews of the
TS 2068 and the new peripherals
that were about to be marketed,
e.g., the modem, the 80 column
printer, the microdrive.
I remember initially feeling
like a member of my immediate
f ami ly had died. I personal ly
have been involved with both
Sinclair Research, Ltd. and
T i mex Computer Corporation si nee
August of 1981 . I had observed
first hand the exci tment and
enthusiasm that the Sinclair and
Timex computer products had
generated from its owners and
users, not to mention all of the
more than 500 third parties that
had developed products to
support the TS computers.
In addition I had worked for
Timex and experienced being laid
off myself, I knew exactly what
those 24 people were feeling,
after being told to get their
personal belongings, since they
no longer worked there. Some
people, like my f ormer boss had
worked for Timex for 23 years,
it is not easy to pick up the
pieces and go on. To these
people I wish them the best.
After a good night’s sleep, I
began to realize that this did
not represent the end, in fact
after reading several accounts
of thi s d i smant 1 i ng in var i ous
newspapers and talking with a
variety of individuals,
including Timex and Sinclair
spokespersons I was feeling much
more hopeful . Some of the
reasons for this included!
1. Sinclair is still in
business. We have an unusual
situation in that Timex was the
distributor for the computer
only in North America and a few
European countries. Sinclair
Research is still marketing the
ZX81 and the ZX Spectrum in the
United Kingdom and the rest of
the world.
2. Sinclair’s newest computer,
the QL or the Quantum Leap has
been very well received in the
UK. Sinclair Research will be
marketing it here in the US this
fall along with their flat
screen tv.
3. Mike Jacobi , the Marketing
Director for Timex, stated that
the marketing and/or
manufacturing rights for the TS
2068 are up for negotiation,
which means that ei ther Si ncl ai r
could get the rights back for
the TS 2068 or some third party
could get the rights to the
computer.
Presently, Sinclair Research
denies any i ntenti on to market
any computer but the QL, but I
have seen this type of si tuat i on
change before. Al so, the
opportunity for a third party to
step in could mean that an
existing company could come in
and take over the marketing
rights or a new company could be
formed of individuals who had
the right combination of capital
and understanding of the TS
community.
This could work to the benef i t
of the present owners and third
party manuf acturers/marketers.
With the right company in
charge, we could see even more
cooperation in dissemination of
information between these
groups.
Only time will tell, in the
meantime, we cannot think that
this whole issue is over, this
is not like Texas Instruments
announcing that they are getting
out of the personal computer
market. There are a few more
variables at play here.
What are we to do in the
meantime? For one thing, I
think that we have to unite.
Particularly user groups, we
need to form a tighter network
of communication between our
members as wel 1 as between user
groups across the country.
One concrete suggestion that I
can give is for user group
directors to poll their members
ei ther formally or informal ly to
determine which users are still
interested in contining with
their Timex Sinclair computers.
Then, if we could gather this
data to disseminate it to the
third parties and/or the any
perspective investors for the
Timex marketing rights, we would
be able to document that there
is a viable market out there !
That it is worth someone
investing more money for product
development and support for TS
rel ated software and hardware.
As for Timex ' plans for the
future, they will continue to
honor the warranties on their
existing equipment, and they
will be selling off thei r
present inventory which includes
TS 1300, TS 2068, limited
supplies of their new modem, and
existing software. The fate of
their 80 column printer and
their microdri ve are right now
on hold, with no plans to market
ei ther of the 1 atter two
products. Basically, anything
that was produced prior to the
announcement will be made
avai 1 abl e, but no new product
development in the computer area
is in the wind for now. < I
qualify my statement because I
have seen things change too many
times to consider anything
MAHONEY next page
MAHONEY continued
associated with either Sinclair
or Timex as final.)
I recieved many calls from TS
owners, third parties, and the
press, from all over the country
and the UK, expressing concern
about what the future will be
for the owners of the Timex or
Sinclair computers. My answer
has been that we need to hang in
there, not to give up, and to
remember that the dust has not
settled. Me have an opportunity
to influence the future of the
Timex Sinclair line, by showing
that there is a strong
enthusiastic market sti 1 1 out
there !
Our group will be glad to act as
a clearing house for
dissemination of information
relating to the Timex or
Sinclair computers. You may
contact Jack Hodgson <617-354-
7899) or myself (203-755-2699)
regarding questions, rumors,
ideas and of course support.
This is a time when we all must
pull together and demonstrate
our i nterest .
POLYGONS continued
30 INPUT "NUMBER OF SIDES" 'N
6
From now on we'll consider all
angles in radians. We can
develop our algorithm using a
little trigonometry .
(If you want to create computer
graphics, you shouldn't have
slept through those trig cl asset
in high school . )
We’ll draw N sides, soi
100 FOR 1-1 TO N
From figure 2 we can see how to
PLOT ths initial point, A.
110 PLOT X+RtCQS P, Y+RtSIN P
Fi nal 1 y, if we want to be able
to draw pol ygons in any
orientation, e. g. , a 4-gon m
ei ther a square or a diamond, we
need an initial orientation!
40 INPUT " OR I ENT AT I ON " ' P
For angles, computers general 1 y
use radians instead of degress,
that’s what the Si ncl ai r-1 • max ’
expects for their trig
f uncti ons. There are 24PI
radians in 360 degrees. If »?e
want to enter the orientation ir
degrees, it is a simple matter
tc convert it.
e>
F* g o r e 2-
45 LL1 F=P#PI/180
To get -from A to B we have to
draw the vector B-A. Since we
have N ^slices in our polygon
"pizza" and 2*PI radian* per
"pie" (2 pi’s in 1?), each
slice, like angle BOA, has 2*PI/
N radians. Thus drawing vector
B-A is:
120 LET Q-P+24PI/N
130 DRAW R* (COS Q-COS P) , R*(SIN
Q-SIN P)
To continue drawing the polygon
we need to repeat (iterate) this
step using the point B as our
starting point. We can
accomplish this by changing the
"old" initial angle P.
140 LET P-Q
150 NEXT I
This is our first algorithm.
Stop and try it. Enter 80 and
80 for the center, 60 for the
radius, 8 for the number of
sides, and PI/8 radians (or 22.5
degrees) for the orientation.
This algorithm is
strai ghtf orward, but not very
efficient. To make it run
faster we can try to shorten th«
work done inside the 1 oop . This
may lead to a 1 onger
initialization, but it saves
execution time because the work
done inside the loop isn’t
repeated. For example, let’s
add line 50 and change 120t
50 LET V-2IPI/N
120 LET Q»P+V
This saves some calculation
time. But our real probl em is
that each iteration of the loop
requires six trig functions (SIN
and COS) to be evaluated. Can
improve on this? Look at figure
3. Note that the 1 ength of each
vector is the same. Call this
length 8. Also note that the
angle of the vectors, cal 1 it T,
keeps changing by 2*PI/N radians
in each iteration (going
counterclockwise) . Let’s modify
our algorithm by changing line
130 and adding 135i
130 DRAW StCQS T, StSIN T
135 LET T-T+V
We must remember to initialize 8
and T (derivations are left as
exercises for the reader) .
60 LET S«2*R*SIN(V/2>
70 LET T-P+PI/2+V/2
In addition, since Q is no
longer used in line 130, we can
consol idate by deleting line 140
and changing line 120 toi
POLYGONS next page
POLYGONS continued
120 LET P-P+V
There is a second, faster,
algorithm. Let's look next at
moving the PLOT statement
outside the loop. In theory, a
new side starts where the
previous one left off. But the
fact that we are working on a
high, yet finite, resolution
computer, and not an ideal
mathematical plane, can get us
in trouble. Because in practice
a roundoff may cause our point
to be one tiny pixel off .
Unf ortunatel y, this condi t i on is
cummul ati ve over the sides, so
the net result can be a polygon
that doesn't close properly.
But do not abandon hope ! For
small values of N the effect is
negligible; and pol ygons with
many sides aren’t really
distinguishable from circles
anyway. So, to create this
third algorithm, move line 1 10
to 80 and delete line 120.
Notice how little is left in the
loop. Further speedup is
possible. For example, we could
replace the FOR/NEXT control
structure with an IF THEN and
GOTO. Another idea is to use
table lookup methods to compute
the trig functions. Finally, we
could always resort to machine
cod#. Having identified and
boiled down the bottleneck, i
the loop, greatly simplifies
using machine code for the
problem.
Let's finish with a flourish.
Add a new input and change line
50 to:
49 INPUT "HOPS" 'H
50 LET V=2*PI*H/N
Try center 80 and 80, radius 60,
sides 5, orientation 18 degrees,
and 2 hops. Why do you think we
called it "hops"?
FINAL POLYGON ALGORITHM
10 INPUT "CENTER’S
COORDINATES" ’ X,Y
20 INPUT "RADIUS" ’ R
25 IF X-R<0 OR X+R>255 OR Y-R<0
OR Y+R>175 THEN GOTO 10
30 INPUT "NUMBER OF SIDES" ' N
40 INPUT "ORIENTATION" 'P
45 LET P*P*PI/180
49 I NPUT " HOPS " ' H
50 LET V»2*PI*H/N
60 LET S-2*R*SIN(V/2>
70 LET T*P+Pl/2+V/2
80 PLOT X+RSCQS P, Y+R*SIN P
100 FOR I»1 TO N
130 DRAW StCOS T, S*SIN T
135 LET T»T+V
150 NEXT I
LANGUAGE
GROLJF* HIGHLIGHTS
Mitch Russo of Zilog, who was
scheduled to speak to us in
March was taken ill and his
appearance will be rescheduled
for a later month. In his place
«a held a free form discussion
on a number of M/L topics.
Answering each other’s questions
and passing on bits of
information.
The bulk of the evening was
occupied by Dave Miller telling
us about his experiences working
with EPROM’ s (erasable
programmable read only
memories). Dave is designing
applications that will load
instantly by using cartridges
instead of cassettes.
Also he’s taken the entire
TS1500 ROM, corrected the bugs,
added a couple of custom
features and put it into his
TS1000 computer. He is working
with an EPROM burner which he
built from plans in the ill-
fated SO magazine. He says he
uses mostly Intel 2716 and TI
2516, 2K X 8, EPROMS. For more
MUUUWUUUUU
Uiitmu
info about Dave’s work you ca
contact him through this
newsletter or at our next M/L
meeting.
Speaking of the next meeting.
Because Bob Heath has moved to a
new assignment it will no longer
be possible for us to meet at
ITEK. He is currently looking
for a new location (any
suggestions?). In the meantime
the April meeting has been
cancelled. Check this column
next month for the new location
or call Jack Hodgson (617-354-
7899)
ARROW
This adaptation of a perennial gaire
format features the fastest movemant
programmable in BASIC on the Sinclair.
Characters are POKEd directly into the
portion of the memory beginning at 16396
known as the Display File. Scoring occurs
when positions in the same file are PEEKed
to see if they are already occupied.
The listing is annotated using variable
names which can be abbreviated to one
letter for typing in. Timing Loops are
used instead of the PAUSE ccnmand. The
PRINT staements after line 900 indicate
bytes used by this program. As given WORM
will run in 2K or 16K on a T/S 1000.
For IK ZX81's, emit instructions and
scoring messages as well as auto-run.
You may want to remove one re jw from the
playing field as well.
The INKEY$ routine in line 110 is
perhaps the shortest way to implement
all four directions in one statement.
Other characters may be POKEd into the
field, but some of these will trigger
lockup or a crash. Line 110 can also be
adapted to work with a joystick such
as described elsewhere in this issue.
This approach to manipulating the
Display File is worth investigating as
the first step towards understanding the
machine code possibilities of our
machines .
HARDER
N GO
THEN
2 = HARDER
CORE + 10
,5; SCORE
GRAPH 1 6K
by Hark Tepper
Here is a program to draw a bar
graph. When it runs you must
enter 20 numbers, greater than 0
but less than 40. My goal in
writing the program was to keep
it as short as possible, thus it
doesn't offer fancy borders,
variable range for numbers, etc.
The program illustrates a
plotting technique you can use
in other programs.
10 REM *** TS1000 GRAPH PROGRAM
20 LET Y * 4
30 DIM A (40)
40 FOR T = 1 TQ 20
50 INPUT A (T)
60 NEXT T
70 LET T « 1
80 FOR Z * 1 TO 20
90 FOR R * 1 TO A (T)
100 PLOT Y, R
110 NEXT R
120 LET T T+l
130 LET Y = Y+2
140 NEXT Z
150 PRINT AT 16,0? "10"
160 PRINT AT 11,0? "20"
170 PRINT AT 6,0; "30"
180 PRINT AT 1,0? "40"
In the "lift's stmrt a rumor"
depts
MAG I G NEXUS ST X FRO
LANGUISH
(The above title i ■ a wonderful
anagram for SINCLAIR-TIMEX HUGS
SAMSUNG AID. )
Let me elaborate on this
potentially good news. The
March 12th edition of Electronic
News reported that Sinclair
Research Ltd. ham signed a
licensing agreement with Samsung
Electronics of South Korea
wherein Samsung will assemble
and market the ZX81 and Spectrum
computers in South Korea.
Samsung will use Sinclair parts
and expects products by the
fourth quarter.
What does this mean to the Timex
-less U.8. market? There are
three more ingredients needed to
make this into a truly great
rumor. First, the South Korean
electronics industry is geared
for export | the average Korean
can’t afford color TVs and VCRs.
Second, Samsung is a huge
company and a big exporter to
U.S. department stores. For
example, many of the "no name"
brand TVs in these stores are
produced by Samsung. Finally,
al though perhaps an unrelated
fact, the T/S 2068s were being
assembled in South Korea.
Conclusions — I'll leave you to
draw your own.
ZEBRA JOYSTICK
by Will Stackmaun
The joystick adaptor available from
Zebra Systems of Woodhaven, N.Y. is an
easy-to-use hardware add-on driven by a
9 byte MC routine, compatible with Atari
type "sticks". With its routine in 1 REM,
the user can adapt any program where
INKEY$ would be used used to_ accept an
input. Thus this interface could also
be used to accept up to 9 external switches
for sane practical applications as well
as gaming. The device is well-made but
barely shielded. It is possible to loosen
the connector socket connections which
are push-fit. There is no trouble plugging
additional peripherals onto the expansion
connector provided. The USR routine can
of course be located above RAMT0P allowing
a number of programs to be loaded under
it.
ZXLR8
by Will Stackman
The leisurely LQADing speed of Sin¬
clair computers has been a drawback
since their inception . Several systems
are available to overcome this handicap.
The ZXL8R program package from G. Russell is
the most economical and quite satisfactory.
Rather than depend on a hardware filter
or an elaborate checksum procedure, this
method of increasing LQADing speed first
has the user calibrate the program to a
particular cassette recorder. The data
received from the calibration program is
then used to adjust the main program when
LQADing or SAVEing.
The ZXL8R is actually a miniature oper¬
ating system, allowing data as well as
program IGADs. Since all programs must be
IDADed by title, there is also a utility
for scanning a tape to list all titles.
Use of this system takes seme practice, but
the documentation is adequate. If programs
are SAVEd at lower calibration speeds (for
more reliability) there is a good chance
they can be reDQADed on similar machines.
Since, as the name implies, this program
speeds op the signal to the x'ecorder, which
raises its pitch, the machine used must
have good treble tone and properly aligned
heads. Strangely enough, the Winky Board
doesn't seem to help when used with this
system.
SO Ml EE NAMES
AT TIMEX
Here are a couple of useful
names of people who still work
at TIMEX Computers.
Elaine Cristillo, 203-573-6815.
Elaine is involved with third
party documentation.
Cathy Hoolihan, 203-573-5246.
Cathy is the person to talk with
if you want to buy products
direct from TIMEX.
USR 832
by Mike Coughlin
So you’ve loaded the copy
protected program you spent the
last month writing on your
TS1000/ZX81, and it’s so well
protected that the keyboard
doesn’t work. Not only that but
you’ve only got one copy. Serves
you right! But there’s a little
known trick (first described in
Syntax ) that will come to the
rescue.
Instead of using the normal LOAD
"name" comand, use a USR call.
The LOAD and SAVE routines are
unusual since they require a
name string as input. The syntax
checker doesn’t like strings
after a USR call. But there are
two statements that wi 1 1 work.
LOAD CHR* USR S32 “name", or
SAVE CHR* USR 632 "name"
The USR 832 statement will start
the LOAD routine, the CHR*
converts whatever is left from
USR to an acceptable input to
LOAD and SAVE and the whole
combination gate past the syntax
checker. SAVE CHR* 832 "" is the
more usual form. First your
intractable program will be
loaded and before it can do any
f uny business the save routine
will execute. If you’ real quick
(you have five seconds) you can
switch tapes and make a copy.
As soon as you see the blank
screen and the pattern from the
SAVE routine, you can hit space
and the program will be loaded
but "unlocked" from any machine
code or BASIC statements that
normal 1 y run i mmedi atel y . You
can LIST and change BASIC
statements, or ref er to your
detailed notes and POKE
corrections to your machine
code. You did keep detai 1 ed
notes didn’t you?
i
The Boston Computer Society helps make sense
out of personal computers If you re interested in
computers for home, business or education, come to
The BCS for objective information and support The
BCS is the largest nonprofit personal computer asso¬
ciation in the United States; our goal is not to pro¬
mote any particular brand of computer, but to help
computer users and people who just want to know
what a computer could do for them
Sign ma up for these user /interest groups:
□ Apple/Boston (Apple)
□ 'Atan User Group
□ Business User Group
□ Consultants & Entrepreneurs Interest Group
□ Database User Group
□ Dispiaywnter User Group
□ Educational Resource Exchange
□ 80/Boston (TRS-80)
□ Family Home User Group
□ Logo User Group
□ EBM User Group
□ North Star User Group
□ Osborne User Group
□ OSI/Boston (Ohio Scientific)
□ Pascal User Group
□ PET/CBM/VIC User Group
□ Robotics Interest Group
Sinclair/Timex User Group
□ Telecommunications User Group
♦♦* ZX PRO/FILE ♦♦*
a 16K+ file manager for the Timex
ZX PRO/FILE is a machine language data base
that gives you tremendous versatility:
♦instant access to any file stored in memory
♦files of any size in the same program run
♦single or multiple word search capabilities
♦ordered file displays
♦comprehensive programmable printer functions
A 59 page manual comes with the cassette. In it
are complete instructions, examples, directions
for upgrading to larger memories, modifications,
program listings, and a detailed explanation of
how the program works. There's even an intro¬
duction to machine coding for beginners.
ZX PRO/FILE is the best file manager you can
get for your Timex. In fact, users report that it
provides data handling functions found only on
the most sophisticated systems.
Price: just $16.95
Let me send you full specifications. Write to:
Thomas B. Woods
P.O. Box 64, Jefferson, NH 03583
Phone: (603) 586-7734
OOThe Boston
OG Computer Society
Three Center Plaza
Boston, MA 02108
617-367-8080
Nonprofit
U.S. Postage
Paid
Permit 1138
Boston, MA
Circle Chess Group
A. F. Stanonis
P.O. Box 63
Des Plaines, IL 60017
