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OOOOThe  Boston  Computer  Society 

SINCLAIR-TIMEX  USER  GROUP  NEWSLETTER 


Volume  2,  Issue  11 


MAINTAINING  £* 

T<=»F =»E  LIBRARY 

By  A1  Spencer 

Here  are  some  hints  for  the 
storage  of  computer  programs  and 
data.  With  the  proper  equipment 
and  procedures  tapes  can  be  a 
reliable  and  inexpensive  storage 
medium. 

THE  BASICS 

Above  all  else,  use  a  recorder 
with  an  index  counter.  Unless 
you  can  fast  forward  or  rewind 
to  the  particular  program  or 
data  of  interest,  you  can’t 
conveniently  store  more  than  one 
or  two  programs  per  tape.  Get  a 
tape  recorder  head  cleaning  kit 
consisting  of  a  cleaning 
solution,  a  head  lubricant 
solution  and  lint  free  swabs. 
Also  get  a  tape  head 
demagni ti zer . 

Dust  is  one  of  the  worst  enemies 
of  tapes  and  recorders,  you 
should  get  proper  dust  tight 
cases  for  groups  of  cassettes 
(which  should,  in  turn,  be 
stored  in  their  individual 
plastic  cases)  and  dust  covers 
for  the  recorders.  If  you  plan 
to  reuse  any  tapes  buy  a  bulk 
tape  eraser,  and  erase  any 
previously  used  tapes  before  re¬ 
using  them. 

ON  THE  LEVEL 

Even  if  the  recorder  has  an 
automatic  level  control  (ALC) , 
it  should  have  a  recording 
volume  indicator  of  some  sort. 

A  meter  is  preferable,  but  ever 
a  "winking"  LED  will  indicate 
whether  the  cable  plugs  are 

TAPE  HINTS  oage  4 


November  1983 


NOVEMBER  GROUP  MEETING 

Wednesday,  November  16,  19S3 

7:00  p . m . 

Large  Science  Auditorium 
UMass,  Harbor  Campus 
(Directions  on  page  2) 


Oc tober  Meet i ng 
H  i  gh 1  i  gh t s 

by  Susan  C.T.  Mahoney 

On  Saturday  October  22  we 
celebrated  our  second 
anniversary  with  a  gala 
celebration  at  the  Boston  Park 
Plaza  Hotel. 

It  really  kept  on  growing  until 
the  day  of  the  show  with  over  23 
exhibitors  and  twenty  different 
seminars.  We  had 
representati ves  from  San 
Francisco,  California  to  London, 
England  and  from  Atlanta, 

Georgia  to  Toronto,  Ontario. 

Our  celebration  truly  was  a 
national /international  event1 

Attendance  is  hard  to  really 
say,  but  in  the  morning  there 
was  barely  room  to  walk  -  there 
was  probably  around  800  people 
who  actually  came  to  our 
cel ebrati on . 

There  were  so  many  people  who 
contributed  to  the  success  of 
the  celebration.  Let  me  take 
this  opportinity  to  thank  a  few 
of  them. 

I  would  like  to  thank  Dan  Ross, 
V.F'.  from  Timex  and  Maggy 
Sruzelius,  Exec.  V.F’.  from 
Sinclair  for  attending  and 
speaking,  it  really  made  a 
difference  having  their  support. 

HIGHLIGHTS 


page 


1  O  REM 


The  Sinclair  Timex  User  Group 


This  issue  marks  the  debut  of  a 
new  managing  editor  o-f  the 
publication.  Cli-f-f  Danielson,  who 
has  led  the  newsletter  through  its 
■formation  and  growth,  has  decided 
to  step  down  to  devote  more  time 
to  other  projects  (computer  and 
otherwise).  Fortunatley  -for  us  he 
has  consented  to  continue 
contributing  articles  so  we  still 
have  him  to  kick  around  a  little. 

In  the  year  I’ve  been  with  this 
newsletter,  I’ve  seen  that  Cli-f-f 
and  John  Kemeny  have  cra-fted  a 
concise,  respected,  and  well-read 
journal.  I  take  over  their  job 
with  not  a  little  hesitation. 

It’s  quite  an  act  to  -follow.  But 
it’s  an  act  I’ll  -follow  with  the 
help  o-f  people  like  Cliff  and  all 
of  our  readers.  We  continue  to 
encourage  the  group’s  members  to 
get  very  involved  in  creating  this 
newsletter.  That  is  what  has  made 
it  as  good  as  it  is  and  will  help 
it  to  get  even  better. 

Our  new  "look"  is  mostly  the 
result  of  changes  in  our  method  of 
production  (paste-up,  typesetting, 
etc.)  that  will  allow  us  to  create 
an  even  more  attractive  and 
informative  publications  than 
we’ve  had  in  the  past.  It  makes 
it  easier  for  us  to  include  photos 
and  diagrams,  program  listings, 
and  much  more.  It’ll  be  a  little 
rough  for  the  next  few  months 
while  we  get  the  bugs  out  but  I 
think  you’ll  appreciate  the 
evol ut i on . 

A  final  notes 

Q.  Why  does  a  computer  hacker  have 
a  hard  time  remembering  the 
difference  between  Halloween  and 

Christmas? 

A.  Because  Oct (al )  31  =  Dec(imal) 


Sue  Mahoney 
Director 
c/o  BCS  Office 
or  203-755-2699 

Jack  Hodgson 
Publ isher /Editor 
P.0.  Box  526 
Cambridge,  MA  02238 
617-354-7899 

John  Kemeny 

User  Group  Correspondent 
284  Great  Road,  Apt.  D5 
Acton,  MA  01720 

Beth  Elliot 

Group  Librarian 

c/o  Sinclair  Research 

50  Staniford  Street 

Boston,  MA  02114 

617-742-4826 

Allan  Cohen 
Meeting  Coordinator 
617-961-3453 

DIRECTIONS  TO  MEETING:  The  S-T 
User  Group  meets  in  the  Large 
Science  Auditiorium  (Room  8/2/ 
009)  of  the  University  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 
shuttlebum  in  the  T  parking  lot. 


n\ . 


HIGHLIGHTS 

Also  thanks  to  the  three 
national  computer  specialists 
■from  Timex  Computer  Corp.  Linda 
Dell’Orto,  Western  Region,  Kathy 
Fitzgerald,  Southeast  Region, 
and  Dan  Kopp,  Northeast  Region 
who  demonstrated  the  TS2068  and 
its  cartridge  software. 

Thanks  to  Greg  Coffin,  Ph . D . , 
Director  of  the  Urban  Schools 
Collaborative  at  Northeastern 
University,  for  lining  up  a 
whole  day's  worth  of  educational 
seminars  and  demonstrations  with 
the  expertise  of  his  staff 
members  Maria  Trozzi  and  Thomas 
Clark  as  well  as  Donald  Duncan, 
an  instructor  at  Milton  Academy 
and  Judy  Field,  teacher  at 
Timilty  Middle  School  in  Boston. 

These  people  gave  us  real  live 
demonstrations  using  the  TS1500 
in  the  classroom  with  students 
from  the  Boston  Public  Schools 
as  well  as  some  discussions  and 
demos  of  videotape  computer 
instruction. 

Let  me  thank  all  the  exhibitors 
that  participated  and  mention 
four  that  joined  us  too  late  to 
be  mentioned  in  last  month’s 
issue:  Cambridge  Computer 
Consortium,  Cambridge,  MA;  Down 
East  Computers,  Greenville,  NC; 
SiriusWare,  Lexington,  MA;  and 
Verada  214,  Providence,  RI. 

Also  not  mentioned  in  last  issue 
were  three  presentors:  Brint 
Jeffries,  Paul  McGarry,  and 
Peter  Nichols. 

It  took  the  help  of  a  great  meny 
people  from  our  group  to  mount 
this  celebration.  To  all  of  them 
I  extend  my  sincerest  gratitude, 
but  especially  to:  Will  Stackman 
who  co-ordinated  the  Exhibition 
area;  Jack  Hodgson  who 
supervised  the  celebration's 
promotion  and  watched  over  the 

HIGHLIGHTS  page  7 


MEW  IMPROVED 

ROM  BUGS - 

"TS1SOO  BUG  =»  ± 
by  John  Kemeny 

Here  we  go  again.  No  sooner  has 
Timex  introduced  their  TS1500, 
with  the  new  improved  ROM  that 
corrects  the  mistakes  of  the 
TS1000  ROM,  than  new  bugs 
appear.  It  is  a  common 
occurance  in  computer 
programming  that  fixing  one  bug 
causes  another.  Unfortunately, 
when  you  put  the  programs  on  a 
ROM,  there’s  not  much  to  da 
about  it.  This  bug  will  affect 
people  who  use  the  area  above 
RAMTOP  to  save  data  between 
LOADs. 

Specifically,  the  bug, 
discovered  by  Dave  Wood,  occurs 
when  a  LOAD  command  aborts.  In 
the  TS1000  ROM,  if  a  LOAD 
aborts,  a  jump  is  made  to  the 
initialization  routine  at  03E5h, 
which  is  part  of  NEW.  This 
routine  resets  the  machine  stack 
which  is  just  below  RAMTOP. 

The  TS1500  ROM  jumps  to  an 
address  which  is  actually  in  the 
middle  of  an  instruction!  The 
problem  is  that  address  0362h 
has  been  changed  E5h  to  E3h 
instead  of  E2h. 

This  bug  causes  unpredictable 
results  upon  LOAD  failure.  Even 
if  the  system  doesnt  crash,  the 
stack  may  be  reset  above  or 
below  RAMTOP.  So  if  a  LOAD 
fails,  you  may  corrupt  the  stuff 
above  RAMTOP. 

We  should  point  out  that  this 
bug  is  not  such  a  problem  if  you 
don’t  have  stuff  above  RAMTOP. 
Then  it  is  just  an  inconvenience 
making  you  pull  the  plug  and 
perhap  re-reset  RAMTOP.  Let’s 
just  hope  that  the  LOADs  on  the 
TS1500  are  MUCH  more  reliable 
than  on  the  TS1000. 


TAPE  HINTS 

connected  properly.  A  volume 
indicator  is  also  helpful  if  you 
plan  to  use  tapes  from  different 
sources.  This  reduces  the 
amount  of  trial  and  error  in 
setting  the  playback  volume. 

A  recorder  without  ALC  gives  the 
user  complete  control  over  the 
recording  process  but  leaves 
them  the  full  responsibility  of 
volume  setting.  However,  for 
computer  applications,  this  is  a 
preferable  situation,  since  the 
signal  volume,  once  set,  is 
constant.  A  very  important 
thing  to  remember  is  that  once 
the  tape  is  rolling  (either  in 
record  or  play)  it  is  too  late 
to  change  the  volume,  because  it 
will  cause  noise  (these  controls 
are  "scratchy").  A  better 
technique  is  to  dry  run  first, 
just  to  set  the  volume. 

Most  of  us  assume  that  the  most 
expensive  tape  has  the  best 
quality  or  that  leaderless  tape 
is  preferable.  The  truth  is 
that  leaders  prevent  breakage, 
stretching  and  twisting  at  the 
end  of  fast  forwards  and 
rewinds.  As  for  price,  don’t 
forget,  you  can  easily  spend 
more  for  tapes  in  one  year  than 
you  did  for  the  computer 
itself.  My  advice  is  always  run 
the  tape  to  "10"  on  the  counter 
to  bypass  the  leader  when  saving 
data.  What  length  should  you 
buy?  Avoid  long  play  tapes, 
those  with  designations  of 
greater  than  C60.  The  long  play 
tapes  are  made  of  thinner  tape. 
They  stretch,  are  too  fragile  to 
survive  mid-tape  start-stops, 
and  are  subject  to  more  "print 
through"  from  adjacent  layers. 
Any  tape  with  a  designation  less 
than  C60  simply  has  a  lesser 
amount  of  the  C60  thickness  tape 
wound  onto  it. 


HOW  TO  WRITE  RIGHT 

Since  the  contents  of  any  given 
tape  will  probably  change  many 
times,  it  is  best  not  to 
identify  the  contents  on  the 
tape’s  box  or  paper  label,  doing 
that  impies  either  overlaying 
the  label  with  more  stick-on 
labels  (’til  the  layer  gets  too 
thick)  or  writing  on  the  label 
wioth  a  pencil  then  erasing  it 
later  and  fouling  up  the  works 
with  eraser  crumbs!  Better  you 
should  identify  each  tape  with  a 
permanent  serial  number  (0000, 
0001,  0002,  etc.)  and  keep  track 
of  the  contents  elsewhere,  like 
in  a  notebook  or  card  catalog. 

One  copy  of  anything  is  as  good 
as  none!  Two  copies  on  one  tape 
are  better  than  one  copy  but  not 
by  much.  One  extra  copy  on  a 
separate  cassette  is  even  better 
but,  to  preserve  sanity,  make 
two  copies  each  on  separate 
cassettes,  of  anything  that 
would  take  more  than  30  minutes 
to  enter. 

Use  AC  power,  not  batteries.  If 
the  AC  power  adapters  cause  too 
much  noise,  replace  or  return 
the  recorder.  The  cost  of  the 
effects  of  weakening  batteries 
can  far  exceed  the  cost  of 
adapters  and  recorders  combined. 


Use  only  one  side  of  a  tape. 

This  reduces  tha  amount  of  high¬ 
speed  f ast-f orwarding  to  the  far 
end.  Never  remove  a  tape  from 
the  recorder  unless  it  has  been 
rewound  completely.  When 
inserting  a  cassette,  always 
wiggle  it  back  and  forth  to  set 
and  center  it. 

Always  press  STOP  on  the 
recorder  before  switching 

TAPE  HINTS  page  7 


THREE  SOFTWARE 

REVIEWS 

by  Will  Stackman 

ZX  PRO/FILE  from  Thomas  B.  Woods 
Software  (ZX81,  TS1000,  16K) 

This  is  a  versatile  text  and 
information  filing  system.  It 
will  store  random  length  files 
from  1  to  over  10,000 
characters.  It  displays  12 
lines  of  28  characters  at  a  time 
and  can  be  used  with  either  the 
Timex  printer  or  a  Centronics 
interface.  It  can  search  very 
quickly  for  one  or  two  "words" 
anywhere  in  the  file.  The  files 
can  be  sorted  by  code  number  if 
it  is  the  final  element  in  the 
file  unit. 

Pro/File  has  extensive 
documentation  and  instructions 
complete  listing  for  BASIC  and 
machine  code,  plus  a  short 
course  in  data  handling  and 
machine  language. 

I  do  have  a  couple  of  minor 
quibbles  with  the  program.  The 
documentation  is  so  extensive 
that  it  really  ought  to  have  an 
index  (there  are  instructions 
for  using  Pro/File  to  prepare 
one) .  The  program  uses  a  28 
character  line  length  and  this 
takes  a  little  getting  used  to 
and  it  doesn’t  allow  you  to 
insert  info  into  the  middle  of  a 
file  unit  without  retyping  all 
the  data  which  follows.  Also, 
it  takes  at  least  six  minutes  to 
load  but  it’s  comparable  with 
FASTLOAD  which  can  reduce  time 
to  less  than  a  minute  and  a 
half.  On  the  positive  side: 
although  the  59  page  instruction 
book  is  occasionally  somewhat 
idiosyncratic,  it  contains  very 
little  "computerese"  and  it 
openly  discusses  modifications 
to  the  program. 

The  author  is  providing  a 
quarterly  newsletter  for  $9.95 


per  year  which  will  cover 
updates  and  further 
modifications.  I  highly 
recomend  Pro/File. 

CRITICAL  PATH  ANALYSIS 
from  Timex 

The  concept  of  "Critical  Path 
Analysis"  is  a  business  utility 
from  Pert-CPM  that  is  useful  in 
simulating  complex  projects 
where  sequencing  of  subtasks  is 
important.  The  Timex  version 
can  be  run  from  minimal 
documentation  provided,  but  you 
have  to  know  how  to  use  the 
method  to  understand  the 
results. 

The  program  has  some  major 
shortcomings.  It  doesn’t  allow 
manipulation  of  the  model  once 
the  paths  have  been  calculated. 
All  data  must  be  re-entered  to 
try  variations.  Completed 
models  cannot  be  saved,  although 
the  results  can  be  copied  to  the 
TS  printer.  Also  all  inputs  and 
results  are  numeric,  no  labels 
or  scales  can  be  used,  you  must 
prepare  and  keep  track  of  tasks 
yourself.  Overall,  I’d  say  this 
program  is  adequate  for  special 
use  it  is  not  for  the 
unprepared. 

THE  FANTASTIC  MUSIC  MACHINE 
from  Simulusion  (2K  or  more) 

The  ZX81/TS1000  has  a  voice  (as 
do  most  processing  systems). 

This  program  lets  you  use  it. 

You  can  listen  by  turning  up 
your  TV’s  sound  but  you  will 
hear  static.  Connect  the  MIC 
output  on  your  computer  to  the 
monitor  circuit  of  a  tape 
recorder  and  you  will  get  a  loud 
adjustable  sound.  You  can  also 
buy  a  small  amp  from  Radio  Shack 
to  do  the  same  thing. 

Using  The  Fantastic  Music 
Machine,  the  top  three  rows  of 

REVIEWS  paoe  7 


the:  chess  exhibit 

by  John  Kemeny 

Chess  is  a  challenging  game,  and 
a  number  of  people  at  the  recent 
TS  Celebration  enjoyed  the 
challenge  o-f  taking  on  the 
TS1500  and  2068  computers  in  a 
match.  Computer  chess  can  be 
made  to  run  at  various  levels, 
with  the  higher  levels  taking 
more  time  -for  each  move  and 
therefore  playing  better  chess. 

A1 1  the  games  at  the  show  were 
played  at  the  lowest  level,  so 
that  the  computer's  responses 
were  almost  instantaneous. 
Nevertheless,  the  machines  won 
over  half  the  games. 

The  TS1500  was  programmed  to 
play  SUPERCHESS.  Linda  Moran, 
from  the  Capitol  Area  Timex/ 
Sinclair  Users  Group  (CATS)  beat 
SUPERCHESS  (with  some  help  from 
bystanders)  in  an  exciting  game. 

Later  Fredrick  Z.  Gregorian, 
who  works  at  Intercomputer  Inc., 
is  a  rated  player  and  plays  at 


the  Norseround  Chess  Club,  tamed 
SUPERCHESS  Level  0  in  just  12 
moves  (see  game) . 

The  TS2068  played  Softsync's  new 
chess  program.  It  has  high 
resolution  pictographs  of  the 
pieces  and  color.  We  understand 
that  a  talking  version,  just 
using  the  2068  (no  attachments!) 
is  also  in  the  works. 

We'd  like  to  thank  Jules  Gesang 
from  CATS,  Mike  Coughlin,  Cliff 
Danielson,  and  Dave  Miller  for 
loaning  equipment  and  software. 
We'd  also  like  to  thank  Roy 
Glasser,  Linda  Moran,  Yossi 
Chodin  and  Susan  Sealy  for 
helping  man  the  exhibit. 

And  finally  we’d  like  to  thank 
Peter  Kuhl  and  the  Boylston 
Chess  Club  for  loaning  us  a 
large  demo  board  which  added 
much  to  the  exhibit  and  Peter 
for  his  comments  on  the  game 
bel ow. 


QUEEN' S  GAMBIT  OPENING 

Gregor i an 

Superchess 

Analysis  by  Peter  Kuhl 

white 

black 

Boylston  Chess  Club 

1 . D2-D4 

D7-D5 

2.C2-C4 

B8-C6? ! 

(Not  best  according  to  opening  theory 
G8-F6  is  more  correct) 

3.B1-C3 

D5xC4 

4.E2-E4? 

(E2-E3  is  better  protecting  the  D 
pawn  and  winning  back  black’s  C4  pawn) 

S. Gl— F3 

C8-E6?? 

(A  blunder.  Allows  white’s  next  move) 

6. D4-D5 

E6-G4 

7. FlxC47? 

C6-E5 

(Why  allow  black  to  save  his  piece? 
D5xE6  is  clearly  called  for) 

8. Dl-A4ch 

E5-C6 

(Why  give  up  the  piece?  G4-D7!  offers 
the  most  resistance) 

9. D5xC6 

G4xF3? 

(Black  is  in  dire  trouble  because  of 
the  pin  on  his  king.  The  bishop  on  G4 
should  be  saved  for  defense  at  D7  or 
H5) 

10. C6xB7ch ! 

C7-C6 

(This  is  the  time  to  resign!) 

1 1 .  A4xC6ch 

12.  B7xA8mate 

D8-D7 

(F6-D7  prolongs  the  agony) 

HIGHLIGHTS 

money;  Beth  Elliot  -for  co¬ 
ordinating  the  volunteers;  Jeff 
Parker  who  was  a  great  help  with 
promotion,  Bob  Masters  -for  his 
help  organizing  and  being  a 
presentor;  John  Kemeny  who 
conceived  and  supervised  the 
chess  exhibit;  Bob  Heath  and  the 
MC  sub  group  -for  their 
fascinating  exhibit;  Judy 
Richland  who  provided  graphic 
arts  assistance;  Allan  Cohen  for 
making  many  of  the  celebration’ s 
signs;  Cliff  Danielson  for 
providing  the  support  of  the 
newsletter;  Kathi  Kuehn  and  the 
SCS  staff;  Rosemary  Fortin  who 
opened  her  home  to  me  to  stay 
when  I  was  in  Boston;  Sinclair 
Research  Ltd.  for  their  support, 
financial  and  otherwise;  and 
finally  but  perhaps  most 
important,  Reston  Publishing  who 
provided  invaluable  supports 
without  which  the  celebration 
couldn’t  have  taken  place. 

We  had  a  very  successful 
anniversary.  I  would  like  to 
thank  all  the  individuals  who 
gave  their  time  to  make  it  a 
success  and  I  would  like  to 
encourage  even  greater 
participation  by  more  of  our 
members  in  the  future. 


TAPE  HINTS 

directions  from  forward  to 
reverse  or  vice-versa,  otherwise 
you  may  stretch  the  tape. 

Always  leave  at  least  10  seconds 
of  space  between  files  because 
the  tape  index  counter  is 
affected  by  "tightness"  of  the 
winding  of  the  tape  on  the  take- 
up  reel . 

Overall,  by  using  a  little 
common  sense  and  basic 
maintenance  you  can  reliably 
take  advantage  of  this 
economical  and  simple  mass 
storage  medium. 


TS 1 OOO  BUG  #5 
DIVISI  OIM 

by  John  Kemeny 

Internally  the  computer  stores 
numbers  as  normalized  binary 
floating  point  fractions.  In 
order  to  maintain  accuracy  in 
division,  the  computer 
calculates  two  extra  bits  for  a 
quotient.  A  bug  at  lBDOh  caused 
the  second  excess  bit  to  always 
be  reset  to  zero.  This  bug  has 
been  corrected  in  the  TS1500 
ROM. 


REVIEWS 

the  keyboard  1-8,  Q-I,  A-K 
become  three  octaves  of  notes, 

9,  0  and  L  become  rests.  The 
10th  key  in  each  line  become 
melodic  end  markers.  All  notes 
sound  as  long  as  the  key  is 
depressed.  This  duration  is 
recorded  by  the  program.  To 
sharp  or  flat  a  note  use  Shift, 
which  rases  the  pitch  by  half  a 
tone. 

2K  of  memory  stores  400  notes. 
The  bottom  line  of  keys  lets  you 
edit  this  composition.  Each 
note  is  numbered,  you  can  step 
through  a  composition  and  change 
any  note.  Compositions  can  be 
saved,  erased,  played 
continuously  between  end 
markers.  Tempo,  tone  and  attack 
can  be  modified  during  playback. 

With  16K  expansion,  over  7000 
notes  can  be  stored,  since  each 
takes  up  merely  one  byte  poked 
to  a  location. 

The  screen  reacts  like  it  does 
during  save  and  load  so  this 
technique  will  not  produce  a 
musical  score  for  your  favorite 
game  or  even  an  entry  beep.  All 
scoring  must  be  done  by  hand  and 
there  is  only  one  voice.  Yet 
the  possibilities  are 
fascinating. 


***  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 


OQThe  Boston 
OO  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 .  St  anoni s 
P.0,  Box  63 
Des  Plaines,  IL 


60017