The Transactor V1 11 1979 Apr 30

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( l tcammadarecomments and bulletins

concerning your

COMMODORE PET™

The TransactorPET™ is a registered trademark of Commodore Inc.

BULLETIN #11Apri l 30, 197

This months Transactor contains an excellent ar t ic le Brad Templeton

on Pet in terrupts . Also information on a PET to IBM se lec t r ic interface.

This is also the final issue of Volume 1. A subscription form forVolume 2 follows. When submitting the form, please address i t to Commodore'sAgincourt address followed by 'Attn. The Transactor ' .

Transactor Volume 2

Yes i t ' s renewal time. Although your Volume 1 subscription coversone more issue. here is the Volume 2 subscription form. The Transactoroperates on a break-even basis . Therefore the cost of "The TransactorVolume 2" will be $15.00.

Recently I have received. various requests regarding art ic le subjects .

If you have a subject idea you and other PET users would l ike to see

discussed in future Transactors. please include i t a t the bottom of theorder form •

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form with your cheque for $15.00 annually renewable, to CBM

3370 Pharmacy Avenue, Agincourt, Ontario, MlW 2K4. Volume 1back issues will be available a t 10 dollars for a l imitedtime only (while supplies l as t ) .

VOll

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Convert Upper to Lower Case

The fol lowing i s a program t h a t w i l l conver t a l l uppercase t ex t to lower case . However, keep in mind t h a t anygraphics above th e a lphabe t i c keys w i l l now be unusable if

they are to appear s imul taneous ly with lower case l e t t e r s .

59030 FOR T=1024 TO 8006-FRE(0):A=PEEK(T)

59031 ON Z GOTO 59034,59037

59032 IF A=153 OR A=178 THEN Z=l

59033 NEXT

59034 IF A=34 THEN Z=2:NEXT

59035 IF A=58 OR A=O THEN Z=O

59036NEXT

59037 IF A 64 AND A 91 THEN POKE T,A+128

59038 B=PEEK(T+l):IF B=34 OR B=O THEN Z=O

59039 NEXT:END

When wri t ing the program use no spaces . The programw i l l conver t s t r i ngs and PRINT s ta tements but w i l l no ta f f e c t DATA s ta tements . Also, it may terminate with a

'?NEXT WITHOUT FOR ERROR IN 59036' bu t t h a t ' s OK.

Of course you need not use the same l ine numbers. Theywere chosen due to t h e i r unusua lness . The program was thenrecorded using the UNLIST rout ine in Transac to r #7. I t canthen be merged with o ther programs with a good chance o f noti n t e r f e r ing with othe r program l i nes .

Karl J.



One of the most important features of the C O ~ ~ a D O R E OtT

operating system is the use of interrupts. They are used to

rese t the PET, and they handle most of the tape and a l l of

the keybOArd i / o . This a r t i c le will provide an int roduct ion

to in tenupts on the 6 ~ 0 2 (The PFT's cpu) and a descr ip t ion

of how t h ~ PET hardles them. for your informat ion, pseudo

source l i s t ing is nrovided for the interrupt software of the..

PET, as oroduced by my disassembler .

Under normal condi t ions, a processor executes machine

code in a l inear fashion. I t moves throuqh memory. ob-

ta ining ins t ruc t ions (which can be one, two or three bytes

long) and e.ecut ing them. Sometimes, cer ta in programmed in -s t ruc t ions cause jumps to other o'aces . jus t . ike ~ O T O and

G ~ S U 8 of bas ic . To make a machine more f lexible . however.

jnteNUpts are orovided to do Jobs that would be very expen-

sive to do in sof tware.

Essent ia l ly . an interrupt is contro ' led by a l ine r igh t

into the processor . When the processor detec ts the correc t

voltage on th is l ine , an interrupt may be generated. First . .

in order to simplify matters . the processor f in ishes the in -s t ruc t ion it is present ly carrying out . Then, if the j n-



terrupt is ok (j nterruots can be masked), The processor saves

the program locat ion i t was a t , and the contents of i t s

f lags onto the s tack. I t then goes to a soecial reserved

area of memory ( in ROM on the PEr) and out l s out two bytes

indicat i"q what locat ion i t should s t a r t executing from. I t

then goes there and executes machine code unt i l the ins t ruc-

t i o r RTI (Return from In teruot S40) is encountered. I t then

goes back to the stack and res tores i t s f lags , and loads the

locat ion i t saved to the ins t ruc t ion counter . I t then goes

and executes the code af te r where i t stopped as though

nothing had occured. CIf the interrupt Drogram was correc t ly

writ ten)

On the 6 ~ 0 2 , three tYDes of hardWare interrupts can oc

cur, as we" as a fourth sDecia1 tYDe. The locat ions they

branch to are keot in hyte Dairs cal led vectors at the ~ n d

of memory. One of these inteNUots, N ~ I or Non Maskable In

terruD t , can not he used on the T. I ts vec tor , SFfF 4- A,

points to SeAbO, which is the ~ i d d ' e of a subroutine. The

l ine for th is is also fixed off by a res i s to r on the pc

board. l a t e r PETs may Dian to include th i s .

The interuot cal led for oower UP is n a ~ e d RES. t t

branches to a rout ine which se ts UD basic and the operat ing

system. I t also . through what I consider to be one of the

PET's worst design f 'aws, branches to the routine to

des truc t ive ly t e s t how much memory is in the machine. At

the very s t 3 r t , it also t e s t s the condit ion of the di"lq-



nost ic sense ( ~ S ~ of SEaIO). and goes to the diagnos t ic

rout ine i f th i s is se t . RES is f i red by power uP. or by

grounding pJn 21 on the hot tom of your memory exoansion bus.

If you se t i t by touching tha t pin . i t does not c lea r memory

below $400. so programs there ( the tape buffers ) are sa fe .

Th is is . un for t un a te I y. 8 ve r y sma" are a • I t vec tors

throuoh \FFfC-O.

The oenera ' use, hardware inte unt is the IRQ. IRQ vec-

t o rs throuqh $FFFE-F. does SRK. This points to locat ion

$E66B in the PET. I t is generated every 60th of a second by

the tv hardware. and can also be generated from the memory

expansion bus. on oin 28. I t is also connected to the 6 ~ 2 2 versat i 'e i n t e r face arlaotor. t will discuss the 60 oer

s ~ c o n d irtterruots here in de ta i I. For information of genera-

t ion hy the 6 ~ 2 2 ( there i s another whole a r t i c l e ' s worth of

(i)

mater ia I in there) you can wri te'10S

for the manua I onit.

t n t e ~ n t s can be generated from i t a t exac t ly timed i n t e r -

va ' s . and by ce r ta in i /o condi t ions on the user por t and

It:: EE hus. The exact ly timed in tervafs are used to send

orecise frequency s ignals to the taoe. (In fac t . the 6 ~ ? 2

is the PET's tane i n t e r face ! )

The 60 per second in taruots do the fo"owing:

Scan the Keyboard. checKinll for new keys and decoding thel'll.

Increment the real time c lock . and check for midnight

l= ' ash th e cursor i f i t is on. ($OZ24'" 0)

Test taoe recorder s ta tus for s t an - s t a r t



Copy a byte for the break ~ e y t e s t .

Whatever else you want them to do.

When the IRO occurs. the code a t S ~ 6 6 B (see source) saves

the processor reg i s t e r A. X and Y on the s t a c ~ . I t then

checks. by loading back from the stack. the f lags . to see i f

the BRK f ' ~ Q was se t . The SRK, a software IRQ. vectors

through the same pSace. but sets the BRK f lag . This is han

dy to t es t what tyoe of i n t e ~ p t occured. I t then does a

Jump ind i rec t to one of two olaces in RAI4 ( " 7 P ~ or szun

denend i ng on the tyoe of i nterruDt.

~ o r m a l l y , the RAI4 IRO vector is se t to $£685, which is

the standard IRQ code. 8RK has no defaul t se t t ing . The

sma" piece of code you see af te r the JI4P indirec ts is the

re turn code. which restores the reg i s t e rs and does the RTI.

The f i r s t thing INT_CaOE does is the JSR INCR_ClnCK which

increments the clock and cODies thePIA

regis te r the break

key t es t uses. When Steve Punter of ~ i s s i s s a u ~ a saw th i s

with the disassembler . he devised an ingenious way to

disable the BPEAK key of the PET. Ry t e l t ing the PET to

branch to '£686 instead of SE685 by means of a POKE 517, 116

statement , the PET bypasses the INCR_ClOCK subroutine, ~ n c

does not t e s t the break key. (Note INCR_ClOCK oasses through

a JI4P vector tab1s in high R a ~ at SFFEA) This has the s ide

ef fec t of turning off the real time clock. When th is s t a t e -

ment is not used the c ' o c ~ proceeds normally. After i t i s

undated, it is comoared with a three byte tab1e that con-



ta ins the value for midnight. If i t is midnight on the

clock . it is zeroed. The PET also keeps a secondary clock

jus t af te r the main one. This is used for ca l ibra t ing the

rea l time c 'ock. ~ b o u t every 6 seconds . th is clock reaches

a specia l l imit . and when i t does . i t is zeroed . and the

main clock is not incremented on th is cycle . This is

becuase the ;nterruot generator runs s l igh t ly fas ter than ex-

act ly bO t imes per second. Even with th is comnensation, you

may have noticed the clock is a few seconds off af te r

several hours of PET operat ion. If they had used the 60 hz

ac power 1ine for the inter uot , i t wou' d have been more ac-

cura te , but tha t would have caused crob'ems for PETs sold

abroad.

once

After doing the clock,

every th i rd of a

i t proceeds to flash the cursor .

second . i f the locat ion FLASHING

($124) is se t to zero. (POKE 5.,.8,0 in a program turns the

cursor on, but with some bugs - try i t and see . ) I t does i t

with a very si ' Iy method tha t has no aooarent ourpose, in -

stead of the standard method. a EOR , ~ O . I t then se t s UP

two keyboard t es t locat ions .

In using your PET, you may have not iced tha t i f the

tape drive is stopped by the machine i t s e ' f . tha t you can

push stoo and P'::JY and the motor wi ,t run again. This is

handled by the sect ion of code a t \E&CO. After th is comes

the keyboard in terpre ta t ion rout ines . The method of

decoding the keyboard PIA has already been published in your



PET manua I , and in PET user notes . so I wi If not dwell on i t

here. Once i t has the matrix coordinate of the key. i t

waits for i t to s t ab i l i ze . to avoid bounce and reoeat ingl e t t e r s . (The TRS-AO does th i s poor ly) . I t then converts

the matrix number to an asc i i character throuqh the table a t

$t:15C. (You can use th is table in your programs. if you

want to account for how long a key is held ~ o w n - a grea t

rea t time feature!) I t then puts the key in the cor rec t

nlace in the keyboard buffer s ta r t ing a t \20f . f ina l ly it

goes back.



~ A L lOU ' A ~ no

Recause the PET IRQ goes through RAM. i t is one of the

m ~ i n l inks you h ~ v e that can give you operat ing s y s t e ~ con

t ro l . You can inser t your own p r o g r a ~ s before and af ter the

in terunt code to have your PEr do two

handle i l o whj Ie running bas ic .

write prBgramS to :

l ike

have used in terupts to

In te rpre t the PET keyboard and the fu l ' s ized keyboard I

~ t t a c h e d to the PET l ike a regular keyboard.

Provide funct ions l ike reoeat af ter a cer ta in period of

time and sh i f t lock.

Turn t h e ! key to a statement number key. so tha t i t would

~ r o v i d e a t ine numher 1n higher with every ~ u s h .

4ave u o ~ e f case l e t t e r keys ~ r i n t out as fufl basic keywords.

~ i s o l a y whole Dages of PEr memory constant ly on the screen .

Provide a non-destructive rese t tha t works in specia l cases .

Much more i s poss ib le .

To use your own programs. you merely se t them uo in

s o ~ e convenient locat ion (machine code onlv ' , preferablv

s ta r t ing at ' oca t lon tha t ends in S ~ 5 . such as ' 385 in the

second taoe buffer . Something located there CAn then be

s ta r t ed with a pnKE538.3 and stopped with POKE 538.130,

rather than having to write a specia l machine l a n q u a ~ e Drogram tha t disables the interrupt with SEI. changes the

locat ions. and enables the inte"UDt with eLl. You do not



need to disable i f you are only changing one byte of the

locat ion . Put soma code thera and fo.low i t with a J ~ P SE 6 a ~ . This way i t does your code and proceeds on to do i t s

own. If you au t in the fol lowing se r i e s :

EE 50 80 ItC ar; E6

s t a r t i ng a t SJar; ( qOI base 1 0 ' • and i n i t i a t e j t wi th- POK E

8,. J you wi II SAe a hyte on the scr een cons tant ly in -

creas ing in "value" . onca every 60th of a second. The PfT

wi I I also be doing everything else usual . The fol lowing

code:

00 SO 00 00 qO 50 an Ea F7 ItC 85 E6

wi It dump a oage of memory on the screen constant ly . You

can ooke Q05 with the oage you wish to examine. Try

I t s ta r t s with oage O. When scanning O ~ g e

O. move the cursor and see what hapoens.

While dOing th i s . you may have noticed tha tt h e ~ e

is no

f l i cke r whatsoever on the screen desal te the massive amount

of writ ing to i t being done. (Far fas ter than BASIC

pr in t ing) . This is because the interi'Upt is f i red by the

screen scan s ignal . an d the screen is doing nothing short ly

a f te r the interruot goes. This is atso why the f iashintJ cur

sor wi I . never "snow" the screen . You can s tore almost half

a screen without "snow" th i s way.

Sometiaes i t is important to out code in a f te r the in

t ~ " U D t code of the PFT. This can be done by manioula t ion of

the s tack . and is necessary for programs l ike the s tatement



numberer or keyword prin ter I included in my l i s t above.

have inc luded some code you can out in to allow you to do

t h i s . ~ p ~ n G means the high order byte Of where your pos t in -

t e ruo t code s t a r t s and P ~ O G is the low order byte . PClO and

PCHI are two locat ions fo r s tor ing the cor rec t pc you can

use. The oroqram works by a l te r ing the s t a c k ~ so t h ~ t the

PET goes to your orogram when i t RTIs. The second par t O f

the orogra . , which f in ishes your routine off ( G O ~ A C K )

rese ts the stack and res tores the prooer orogram counter and

m ~ c h i n e r eg i s t e r s . You should be able to h a y ~ a lo t of fun

with it.

I t should be noted t ha t orobabfy the only reason the

I ~ O vector is in R A ~ is tha t the PET does change i t for taoe

ilo rout ines . There is a t ab le of oossible vectors s ta r t inq

at 'F026 in the r O m ~ and the tab le ends with the s tandard

vector IE685. I f you ever change the high order byte of the

IRQ RAM v ~ c t o r , you must rese t i t before tape i /o is d o n ~ .

If you d o n ' t ~ the PFT wi" rese t i t anyway, but the tane ilo

may not be done, and you may crash your PET.

IncidentaHy, the disassembler was wri t ten in the system

language B (a very nice , much improved SCPl) here a t the

Univers i ty of Waterloo where I go to school and work for the

~ a t h e m a t i c s Facul ty Comouting Faci f i ty . This a r t i c ' e w ~ s

also preoared and formatted on the s a ~ e Honeywell 66 /60 .

~ a n y of the labels used in the disassembly were o r o v i ~ e d t ~ r o u q h the massive e f for t of examining the ~ E T s ~ O ~ s done



by J i ~ Sutterf ie td of Toronto. next art i c l e for the

Transactor witt be on programming i n t ~ r a c t i v e games for the

PET.

m The 6522 Data Sheets (24 pgs.) and other MOS publicationsare available through dealers .



~ e r e is the code fo r the inter, .uots on the PET

E6b8 48 I ~ n E R U P T PH!J!:;hbC 8A TXAEhbD 48 P ~ A EbhE 08 TVAEbbF 48 PH!E670 BA TSXE671 AD 04 01 LOA \104,Xr:l,74 ?Cl 10 ANn H.1 0

Eb 7h FO f)1 BEO "E" 781:678 F-C 18 02 J"1P ( A ~ K _ l O W l E679 he 10 f)2 J'1P t IR(Ll(1WJE67f 68 R E T t J R N _ I ~ T PlAEb7F A8 TAVEl, 80 M\ PlAEft In AA TAXr:682

6P. PlAE681 40 RTf

£"84 "0 RTS

E685 ?O fA FF TNT_CODF JS R r N C ~ _ C l n C l < ' Eft 1\8 An 74 02 ll)A F l A S ~ I N G Eft AA I) f) 21 RNE \E6BOEfd\O C'F ?C; 02 DEC C_TI'1ERF600 00 IF RNE 'EbBOE60? AO 14 lOA #$14

E604 AD 21} 02 STA C _ T I ~ E Q Fb07 A4 F2 lOV C_C Ol U'1NEbClo ItE ?7 02 lSR C_STATEF" oC 81 FO UH (C_ROWADR) .VEI) ClE qO f)b BCS \EbA6E6AO FE ':'7 02 INC C_STATEE6A3 80 26 02 STA CHAR_UNO_CEhAb OA ASlEI)A7 qo Aes "EbACEhAO 18 SECEI)AA ()t Res 'FbAOFbAC lA ClCFo An 6A Rr)R

EoAE 01 EO STA (C_ROWA.OR).YE680 A2 FF If)X "FF

E6A? 8£ ':'1 02 STX KEY_I"-AGEEbB5 F8 I"4)t'fhAb 8F 04 02 STX SHIFT_FlE6eo A2 150 lOX " ' 50

EbBA AO to F8 lOA PIAlEfteE 20 FO A"4D ,"::0



E6CO aD 10 f8 STA PIAlEflC 3 AO 00 lOY . ~ o E6C5 AD 10 E8 LOA PIAlE6C 8 OA ASLE6CC) OA ASLEflCA OA ASlE6C8 10 01 SPL ~ E 6 0 1 t E6CO AC 07 STY Cl_STAT

E600 At} 30 LOA '$30E602 no 07 Bt.4E $ E 6 0 ~ E6DIt AD 07 02 LOA Cl_STATE6D1 no 05 BNE SE60EE6Dq Aq 15 LOA '$35E608 80 13 E8 STA PIAl_BitE6DE qO OA BCC $E6EAE6EO 8C OR 02 STY C2_STATE6E3 AD ItO f8 LOA PORT_RE6E6 Oq 10 ORA #S10E6E8 00 OA B ~ f SE6F4E6EA AD 08 0'. LOA Cl_STATE6EO 00 oa BNE ~ E 6 F 1 E6EF AD 40 E8 U)A PORT _BE6F2 Zq Ef AND #SEfE6F4 80 40 E8 STA PDRT_BE6F7 AO 08 LOV #$8E6Fq AD 12 Ea L,)A KB_ROWINE6fC CO 12 Ea C ~ P KB_ROWINE6Ff ')0 F6 BNE $F6F7E101 itA LSRE102 AO 05 Be s $F 7 0qE704 48 PHA£105 7.0 3F E7 JSR !)ECOOE_KBOE708 68 PLA

f70c) CA OEXE70A FO 08 REO $E714E70C a8 OFYE700 00 Fl Bt.4E \E701f70F F.E 10 E8 INC PIAlE712 DO RNE SE6F7E714 AD 23 02 LOA KEY_PUGEE717 CO 03 02 C ~ P KEY_DOWNE71A 1=0 20 BI:O $E73CE11C 80 03 02 STA KEY_DOWNE71F AA TAXE720 10 lA I $E71C£722 SO 58 £7 LOA $E758.)(

E7?5 4E 04 02 LSR SHIFT_flE728 qO 02 BCC SE72CE72A Oq ao ORA #$80

E7lC AE 00 02 LOX KEYCOUNTE72f (lD Of 02 5TA KEY_8UfF.XE732 F8 IN )(

E733 EO OA CPX '$AE735 00 02 BNE $E73q



E137 a2 00 LI)X #\0E7':\Q sf 00 02 ST X KEYCOUNTE73C 4C 7E E6 J"1" RFTURN_I NTE73f 58 E7 O':COOE_KI\O LOA \E 7'Hh XE742 1)0 07 ANE \F74AE744 AQ 01 lOA #$1f.746 AD 04 07 srA SHtfT_fl

E74Q no 10 SNE '\E 75BF74B Cq FF C-.,P #$fFE740 FO 1)( REO $E75AE7/tF Co 1C C"1P #$3C

E751 no 05 ANE \E75AF753 ?C 11 EB BIT PIAl + 1E756 30 13141 'f,E7,)R£=1')8 BE 73 07 STX K E Y _ I I 4 A G ~ E7,)B flO RTS

F736 AD OC; 02 lJPflATE_ClK lOA ClOCK_?F13<) flo 01 lOC .\.F738 05 07. STA ClOCK_?F73E <)0 01 BCC SF743F71,0 FE Of, 02 INC ClOCK_? + 1F7 I, 3 CQ 6F Cto1P #'t6FF745 !)O 07 ANE '\F74EF71,7 aD 06 1)7 lOA ClOCK_? ... 1F71,A ('Q 02 C"1" #$?F7 4C FO ?6 ~ E O \ f774F14E FE 02 07 tNC Io4_ClOCK ... ?F'1 r; 1 no OB SNE SF 7r;RF753 FE 01 1)2 INC Io4_ClOCK + 1F7r;6 no 03 BNF \F 7'H3F75A fE 00 02 INC to1_ClOCKf758 A2 00 ll ) X f$O

F750 RO 00 07 lOA ~ _ C l O C K , X F760 nD A8 F7 Cto1P Sf7 ~ 8 , XF763 <)0 17 BCC $F77CF76r; Fe tNXF766 FO 03 CPl( #$3F768 00 F3 BNE $F750F76A AQ 00 ll)A #\0f76C <)0 FF 01 STA $lfF,XF76F CA OEX

F770 00 fA ANE \F76CF772 FO 08 A!70 \F11C

F114 AQ 00 lOA# \0

F776 80 OC; 02 srA ClOCK_7F77q eo 1)6 O? STA Clf"lCK_? ... 1F71C AD 17. £1\ lOA KB_ROWINf77F ( '0 12 E6 C'1P KS_ROWINF762 no F8 BNF Sf77Cf181t AD nQ 02 STA PIA_COPYF787 flO RTS



Here is the source for the post inte"UDt code program

ST ART LOA ~ l O · ; ' X GET

STA PClf) PROGRA'1LOA ~ 1 0 6 . X COUNTER AND

STA PCHt STORE ITtOA PRO'; PUT IN YOURSTA ~ l O t ; , X OWN CODE

ll'A )PRnG LOCATIONSTA "106.XJMP ~ E 6 ~ 1 ) 00 NOR'1AL t N T F ~ 1 J P T Pf'1 THIS CODE GOES AFTER YOUP. CODE. TO RETURN

G'1BACK lOA PCHI I:lESTORE

PH" OL 0LOA PCLf) LOCATIONPHA

TSXOf X RESET( 'f X STACKOf X

Of X

TXSJ ~ P Sf 61) f DO RTI



KVENICH & ASSOCIATESInternational Trade Brokers

151 Carlingview Drive Unit 5 Rexdale, Ontario M9W fiE7 • Phone ~ 7 ~ - 1 1 1 1 Telex ~ ~ - q q t " l l " ' l "

ATTENTION: NEW PRODUCTS

KVENICH & ASSOCIATES HAVE BEEN ASKED TO DISTRIBUTE THE WAVECOM

INTERFACE. DESIGNED BY THE MICRO-SYSTEMS ENGINEERING GROUP,THIS NEW PRODUCT WILL INTERFACE THE PET COMPUTER AND THE I.B.M.SELECTRIC TYPEWRITER FOR COMPREHENSIVE WORD PROCESSING.

THE WAVECOM INTERFACE IS A STAND ALONE DEVICE WHICH CONTAINSITS OWN PROCESSOR AND ROM MEMORY. NO PROGRAMMING IS REQUIREDTO RESIDE IN THE PET'S 2nd CASSETTE BUFFER AS IS THE CASE WITHMANY INTERFACES PRESENTLY ON THE MARKET. THIS FEATURE ALLOWS

THE USER THE 2nd CASSETTE FOR BUSINESS FILES OR ACCOUNTINGPROGRAMS.

FEATURES OF THE WAVECOM INTERFACE

1. A stand alone interface.2. Plugs into the PET COMPUTER via the IEEE port .3. All parts are included with the WAVECOM interface (including

plugs, and wire connectors).4. Plugs into the SELECTRIC typewri ter.S. Instal lat ion of solenoids and plugs are required for the

SELECTRIC by the user or dealer a l l parts are included.are provided.

6. Can be used with a SELECTRIC terminal. Communication is

via a telephone handset through an acoustic coupler. Nomodifications are necessary.

7. Will also operate with many other computors such as TRS-SO,SOCERER, and APPLE.

8. Unplug the SELECTRIC typewriter from the WAVECOM Interfaceand the typewriter wil l return to normal manual operat ion.

9. Allows any computor to completely control a ll user controlledkey including, the TAB FUNCTION and the BACKSPACE key.-------------------------------------------------------------------

NEWS

RELEASE



HOME COMPUTER CENTRE

Computers lor Home & SmaLL Business

(416) 222-1 165

222-1166

6101 YONGE STREET. WILLOWDALE. ONTARIO M2M 3W2. CANADA

HCME CCMPUTER CENTREANNOUNCES

THE NEW RELEASE OF PET SOF'lWARE

The following programs are now officially released with completedocumentation.

1. ENTRY-

List Price$24.95

2. PROCESS -

List Price$24.95

3. INVENTORY -

List price$24.95

Used as a general purpose data entry program for business applications with user definable entry format,th e program may be used for a Mail List, Daily Journial,General Ledger, Record Keeping etc. I t works withcassette printer, and other IEEE devices.

General purpose data process program. I t is designedfor limited data processing power on the PET. Basicoperation includes SORT, EDIT, DELETE, INSERT, andMACRO. The program is particularly useful for merginglarge amounts of data from different input sources.

Inventory control program on the PET Data includes, item. , description, quantity on hand, reorder limit andprices. I t generates inventory report and low inventoryreport. Handle up to 60 items on the 8K PET. Data maybe insert, delete, change, on the memory instantly.

All the HCC offical ly released programs come with complete documentation.The programs are intended fo r practical business applications, and specialtechniques are used to insure easy operation and data reliabili ty. Specialfeatures include interactive message, error-free operation, recoverableoperator errors, general I/O etc. The released programs have been tested

for an extended period of time.



COMPUTER COURSES FOR EVERYONE

Human Computing Resources Corporation presents an ongoing program of courses on computers.

The courses have been created in response to the growing need for an objective, non sales oriented, viewpointon how to evaluate personal computers, microcomputers and minicomputers. They will be attractive to

people from many walks of life - business people, professionals, artists, engineers, enthusiastic new users.They will be doubly attractive to people who have researched the computer market and find they lack theexpertise to choose one system over another.

Being offered in spring/summer 1979 are:

Introduction to Computing and Personal Computers (bimonthly; 9 hours)How to Buy a Computer for Small Business (23 May and 18 July; one day)Introduction to Microprocessors (23 and 30 June; 14 and IS August; 2 days)Introductory Programming in BASIC (monthly; 18 hours)Programming in PASCAL (bimonthly, beginning in June; 18 hours)

In the works are courses on word processing, computers in the law office, and computers in medicine and inthe medical office (two courses).

Our instructors are skilled educators, business people and creative computer professionals. They have hadbroad experience with all types of computers and computer applications.

All courses are held at HCR's offices, 10 St Mary Street, Suite 401, Toronto (near Yonge and Bloor), or indowntown Toronto hotel suites. Courses are priced at from $55 to $115. Fees for all courses are incometax deductible.

For more information, mail in the form below, or call us at 922-1937.

Please send me information about these courses:

( ) Introduction to Computing andPersonal Computers

( ) How to Buy a Computer for Small Business( ) Introduction to Microprocessors( ) Introductory Programming in BASIC

( ) Programming in PASCAL

( ) Introduction to Electronic Troubleshooting( ) Introduction to Computer Graphics( ) Introduction to Word Processing( ) Computers in the Legal Office( ) Computers in the Medical Office( ) Frontiers of Medical Computing

NAME ________________________________

COMPANY & TITLE _________________ADDRESS ________________________________

PHONE ____ _



r l f \ ~ c o m m SYSTEMS 'N C. QOHALEnOAD, tlNll7. BRAMP10N,ONT, L6W3M1· (416)459 7616

Nakcomm Syster,ls Inc . wishes t.o extend thanks to Commodol::e fen tileopportll(l l ty Lo o f f e r you sev e ra l new PE'I' compatable i tents.

Yell may f i.nd !:hese uni t s an economi ca l and easy way to expdlld t l l \ ~ cc1paLi l i t iE's o f your PET:

Mini Pr in te r Modul '1'<..'-} 00

40 Charac te r Per Second96 Characb ' r s e t5 X 7 dot matri.x

List: Pril 'L: ; ; ~ q l j . ' ) ~ ;

Ful l SiZLl l < e y b ~ ) t \ L d Hock l '}·}-I\I\

l . i s t Pr ic0 $199.95

32 K B1 lu Expansion BoardHodel r m ~ - 3 2 L i s t fTice $ 9 1 ~ . l ) 5

SPJ::CIAL NOTg; ~ J e a lso have av a i l ab l e , an In t e r f ace Model P'J'p-] 0 ,

a l l o w i n ~ the PET to opera te with any Centronics Pr i l l t e r . Lis t Pr i ce $ b 9 . ~ ~ 0 n le r s pIdced d i rec t ly on Nakconun Systems Inc . wi l l be dual t wi t i l l ' l ' l lnli, t 1,/.

Our 'l 'erms and Condi t ions a re as fo l lows:Paymcllt 'Cash (cheque or money order) wi tIl order .

Warranty 90 Days pa r t s and labour .

D01i.very 1 to 3 weeks depending on i tem and s tock.

After Warranty Service Done on the Nakcomrn premises .

I f you H c q u i ru any addi t i o n a l informat ion on the above dosel i bed tI ll j t S U l

fu r tLer e}:plandtion of our o f f e r , con tac t us a t any t ime.

Yours very t r u l y ,

Nakcon® Systems Inc .

Donald R. Young,Marketing Co-Ordind.tor.

Dealer Inqu i r i es Inv i ted

The Transactor V1 11 1979 Apr 30

Documents

Transcript of The Transactor V1 11 1979 Apr 30