Compute_n 15_p 101
Contents
1. each incoming wave It s action action everywhere Lots of excitement 14 95 MONSTER MAZE An Arcade style action game where you run a maze devouring monsters as you go If one sees you first you become lunch meat Easy enough for the kids to learn and challenging enough to keep daddy happy 12 95 COLLIDE Fast paced lane switching excite ment as you pick up points avoiding the jam car If you succeed we ll add more cars The assembler code provides fast graphics and smooth action 9 95 SPECIAL DEAL THE ENTIRE EDSON PACK ALL THREE GAMES FOR 29 95 THE AARDVARK JOURNAL FOR OSI USERS This is a bi monthly tutorial journal running only articles about OSI systems Every issue contains programs custom ized for OSI tutorials on how to use and modify the system and reviews of OSI related products In the last two years we have run articles like these 1 A tutorial on Machine Code for BASIC Programmers 2 Complete listings of two word processors for BASIC IN ROM machines 3 Moving the Directory off track 12 4 Listings for 20 game programs for the OSI 5 How to write high speed BASIC and lots more Vol 1 1980 6 back issues 9 00 Vol 2 1981 2 back issues and subscription for 4 additional issues 9 00 ACCOUNTS RECEIVABLE This program will handle up to 420 open accounts It will age accounts print invoices including payment reminders and give account totals It can add2. 00 baud which would allow you to LIST a program on your printer and tape at the same time But if you want or need to run your printer at high speed we can run 4800 baud with no hardware changes for printing reports making listings of one program etc then you will need the handshake capability For the handshake capability we can connect one of four different ways depending on our printer to the Superboard s CTS Clear to Send bus If your printer uses an RS232 compatable BUSY READY signal then connect it to pin 3 of J3 and 1 If the signal is high when the printer is ready connect pin 6 of J3 to pin 9 of J3 See figure 3 2 If the signal is low when the printer is ready connect pin 10 of J3 to pin 9 of J3 See figure 3 If your printer uses a TTL compatable BUSY READY signal here we can omit Q2 D16 R62 R66 and 1 If the signal is high when the printer is ready connect the signal to pin 6 of J3 the connect pin 10 of J3 to pin 9 of J3 2 If the signal is low when the printer is ready connect the signal to pin 9 of J3 See figure 3 Then in all cases in figure 2 cut one foil and connect between 2 pads as shown to route this CTS signal to the ACIA That s it for the hardware You now have your serial port ready to run your printer Although this article descr ibes a hook up to a printer we can also hook up to a terminal and use the serial port as an audio port More on the audio port at the
3. MULATOR STREAMWOOD ILLINOIS c2 c4P 60103 FULL GRAPHICS MADE EASY C1 C2 C4P 14 95 VERY USEFUL UTILITY PROGRAM SIMON FULL GRAPHICS SOUND C4P C1 C2 C4P il 95 ADD STEREO MUSIC To YOUR SYSTEM PLANS AND COMPLETE DOCUMENTATION TTL Logie VOTRAX PROGRAMS ON CASSETTE FROM CATALOG WITH PROGRAMMING TIPS AND HARD COPY OF FULL GRAPHICS PROGRAM f ALL SOFTWARE COMPLETE WITH HARD COPY 741 SURREY DRIVE 312 837 7569 e HEW e Rampaging Robots ALIR SPACESHIPS ANE RELEASING HORDES OF MUGE KILLER ROBOTS ON THE EARTH HO MANY CAN YOU DESTAOY BEFORE THEY GE Your EXTRA POINTS AND BONUS ENERGY by JOHN WILSON eMEWe COMING SOON oeFSeAiIBEa Introductory Offer 35 Pretzelland Software 2005A WHITTAKER RD YPSILANTI MI 48197 CTs FROM WII Connect pads together Cut foil here I For handshake capability from printer cut foil where shown make connection where shown Figure 2 Figure 3 COMPUTE August 1981 Issue 15 Announcing COMPUTE s FIRST BOOK OF PET CBM Since our first issue in the Fall of 1979 we ve provided more PET CBM infor mation to owners and users than any other magazine in the industry Now we re taking the best of our published material adding new material and putting it all together into our first soecial PET CBM book COMPUTE s First Book Of PET CBM will be available in the early Fall With a design intended to
4. NERAL LEDGER program which records all transactions and which provides monthly quarterly annual and year to date PROFIT AND LOSS statements GENERAL LEDGER also provides for cash account balancing provides a BALANCE SHEET and has modules for DEPRECIATION and LOAN ACCOUNT computation GENERAL LEDGER and MODULES 129 95 PAYROLL is designed to interface with the GENERAL LEDGER It will handle annual records on 30 employees with as many as 6 deductions per employee PAYROLL 49 95 INVENTORY is also designed to interface with the general ledger This one will provide instant information on suppliers initial cost and current value of your inventory It also keeps track of the order points and date of last shipment INVENTORY 59 95 GAMES FOR ALL SYSTEMS GALAXIAN 4K One of the fastest and finest arcade games ever written for the OSI this one features rows of hard hitting evasive dogfighting aliens thirsty for your blood For those who loved and tired of Alien Invaders Specify system A bargain at 9 95 MINOS 8K Features amazing 3D graphics You see a maze from the top the screen blanks and when it clears you are in the maze at ground level finding your way through on foot Realistic enough to cause claustrophobia 12 95 NEW NEW NEW LABYRINTH 8K This has a display back ground similar to MINOS as the action takes place in a realistic maze seen from ground level This is however
5. OSI AARDVARK OSI NOW MEANS BUSINESS WORD PROCESSING THE EASY WAY WITH MAXI PROS This is a line oriented word processor de signed for the office that doesn t want to send every new girl out for training in how to type a letter It has automatic right and left margin justi fication and lets you vary the width and margins during printing It has automatic pagination and automatic page numbering It will print any text single double or triple spaced and has text cen tering commands It will make any number of multiple copies or chain files together to print an entire disk of data at one time MAXI PROS has both global and line edit capability and the polled keyboard versions contain a corrected keyboard routine that make the OSI keyboard decode as a standard type writer keyboard MAXI PROS also has sophisticated file capabibilities It can access a file for names and addresses stop for inputs and print form letters It has file merging capabilities so that it can store and combine paragraphs and pages in any order Best of all it is in BASIC OS65D 51 4 or 8 disk so that it can be easily adapted to any printer or printing job and so that it can be sold for a measly price MAXI PROS 39 95 THE EDSON PACK ALL MACHINE CODE GAMES FOR THE 8K C1P INTERCEPTOR You man a fast interceptor protecting your cities from Hordes of Yukky Invaders A pair of automatic cannon help out but the action speeds up with
6. a real time monster hunt as you track down and shoot mobile monsters on foot Checking out and testing this one was the most fun I ve had in years 13 95 TIME TREK 8K Real Time and Real graphics Trek See your torpedoes hit and watch your instruments work in real time No more un realistic scrolling displays 9 95 SUPPORT ROMS FOR BASIC IN ROM MA CHINES C1S C2S This ROM adds line edit functions software selectable scroll windows bell support choice of OSI or standard keyboard toutines two callable screen clears and software support for 32 64 characters per line video Has one character command to switch model 2 CIP from 24 to 48 character line When in stalled in C2 or C4 C2S requires installation of additional chip C1P requires only a jumper change 39 95 C1E C2E similar to above but with extended machine code monitor 59 95 Please specify system on all orders This is only a partial listing of what we have to offer We now offer over 100 programs data sheets ROMS and boards OSI 313 669 3110 for OSI systems Our 1 00 catalog lists it all and contains free program listings and programming hints to boot AARDVARK TECHNICAL SERVICES LTD 2352 S Commerce Walled Lake MI 48088 OSI August 1981 Issue 15 COMPUTE 401 OSI RS232 Port And The High Speed Printer Interface Paul Lilly Pelham AL What About It I believe the thing I like most about my Superboar
7. automatic interest charges and warnings on late accounts and can automatically provide and cal culate volume discounts 24K and OS65D required dual disks recom mended Specify system Accounts Receivable 99 95 SPECIAL DEAL NO LESS A complete business package for OSI small systems C1 C2 C4 or C8 Includes MAXI PROS GENERAL LEDGER INVENTORY PAYROLL AND ACCOUNTS RECEIVABLE ALL THE PROGRAMS THE SMALL BUSI NESS MAN NEEDS 299 95 P S We re so confident of the quality of these programs that the documentation contains the programmer s home phone number SUPERDISK II This disk contains a new BEXEC that boots up with a numbered directory and which allows creation deletion and renaming of files without calling other programs It also contains a slight modification to BASIC to allow 14 character file names The disk contains a disk manager that con tains a disk packer a hex dec calculator and several other utilities It also has a full screen editor in machine code on C2P C4 that makes corrections a snap We ll also toss in renumbering and program search programs and sell the whole thing for SUPERDISK II 29 95 5 1 4 34 95 8 ANDFUN TOO BOOKKEEPING THE EASY WAY WITH BUSINESS Our business package 1 is a set of programs designed for the small businessman who does not have and does not need a full time accountant on his payroll This package is built around a GE
8. cies generated in the cassette portion of your Superboard Since the PRINT statement sends its argument to the ACIA when in the SAVE mode we can output to the printer any results we normally send to the video screen Most small system printers provide 80 columns per line The Superboard software is set up to force a LF CR after 72 consecutive characters to the ACIA During a cold start the system defaults to a terminal width of 72 characters per line if you try to request a larger line length This can be fixed by writing 80 Hex 50 in the terminal width storage location hex F after initialization by the statement POKE15 80 August 1981 Issue 15 COMPUTE 403 Table 1 Control Register Usage Bits D0 amp D1 DI DO RESULTS 0 0 TX Clock input equals the transmit rate baud 0 1 TX Clock input is divided by 16 to give transmit rate baud 1 0 TX Clock input is divided by 64 to give transmit rate baud 1 1 Reset ACIA OSI HEXDOS Can your disk operating system do this No matter what you do with your C1P or Superboard II here s a remarkable disk operating system that will help you do it better By using subroutines in OSI s ROM BASIC HEXDOS offers power versatility and incredible compactness only 2K HEX DOS far surpasses the capabilities of OS65D liberating 10K of memory and disk space in the process Load or save BASIC programs machine language and data Table 2 Control Register Usage Bit
9. d I is that it is full of surprises Whatever OSI lacked in documentation they made up for it in utility you just have to find it While users of other systems pay upwards from 100 for a serial inter face you can put one on a Superboard II for around 5 And that includes a software selectable baud rate with handshaking This article will show you how to install the port and how to use it as a high speed printer interface How To Do It OSI shows the schematic for this interface in their user manual and although the board has the runs etched in it the parts were not installed by OSI But don t try going by the board layout to plug in your parts it s not exactly correct Figure is a correct board layout If you only need a one way port you can omit Q2 D16 R62 and R66 If you want true RS232 voltage swings you can cut between the 2 pads shown in the Note and hook the high end pin 7 of J3 to your negative supply I have an Anadex DP8000 printer hooked up to my Superboard and although the manual for it says it needs a minimum of 3 volts for its RS232 input I ve left the 2 pads connected voltage to printer swings 5 to 0 volts and the printer works just fine anyway Of course that doesn t mean yours will so you may want to add the negative supply If you don t need or want the extra speed from your printer you need not hook up the handshake signals This v you would be trans ferring information to your printer at 3
10. end of this article A little about the ACIA Before going further some understanding of the ACIA is necessary OSI uses the Motorola 6850 ACIA chip which has 4 registers in it Two registers we can read from only the Receive Data Register read hex addr F001 and the Status Register read hex addr F000 The other two registers we can only write into the Transmit Data Register write hex addr F001 and the Control Register write hex addr F000 The Control and Status registers are what give us the programmable flexibility to get the most out of our 5 interface The control Register allows us to select the format we use to transmit and receive bits select our transmit rate baud enable or disable control and interrupt signals and reset the ACIA Bits DO and D1 are the counter divide and reset bits Table 1 shows the usage for these bits As shown in the table we can select 1 of 3 102 COMPUTE August 1981 Issue 15 possible divisions of our transmit clock merely by programming it If you have a stock Superboard II the TX clock input is approx 4800 Hz The monitor ROM during system initialization sets the clock divide to 16 which gives us our baud rate of 300 for our cassette interface Now here s the trick prior to outputting to our printer we write zeros into D0 and D1 setting our clock divide to 1 With our existing TX clock input of 4800 Hz this will give us a baud rate of 4800 Now we have 300 baud for o
11. ions and programming Check the manual for your printer and see what is necessary to set it up for an RS232 input at 4800 baud The Anadex printer has 3 sets of dip switches that can be set for a wide range of baud rates different types of interfaces paper length number of lines to skip over perforation etc Hook the BUSY READY output from the printer to J3 of your Superboard as described earlier for your system Hook the RS232 output from your Super board J3 pin 2 to the printer input Hook pin 1 of J3 to the printer COM line ground Turn on your printer and away you go Add A Speaker If you don t have a printer at this time but want to go ahead and make the hardware addition anyway you can use this port to hook up a speaker You can connect an 8 ohm speaker between pins 1 and 2 of J3 Now set up for 4800 baud and see how your program sounds when you LIST it You can expand on this idea and add some interesting effects to your existing programs Remember when you are in SAVE mode any PRINT argument goes to the ACIA as well as your screen when you LIST it Some Finals You should be careful not to program the ACIA while you are in the SAVE mode I don t know why but it hangs up the system sometimes when you try to do it POKE517 1 will put you in SAVE mode and POKE517 0 will take you out of it Although you can now run your printer at 4800 baud you are still limited to 300 baud for your cassette due to the audio frequen
12. make it easy to use and contents aimed at assisting a range of users from beginners to advanced you ll find that COMPUTE Books will become a valuable and permanent addition to your reference library But what else would you expect After alll we re the resource Reserve your copy today at your COMPUTE dealer If one s not handy use the coupon below or call TOLL FREE 800 227 1617 Ext 404 In California call 800 772 3545 Ext 404 We accept MasterCard and VISA Dealer Inquiries Invited PETICBM trademark of Commodore Business Machines Inc Please send me ___ copy s of COMPUTE s First Book Of PET CBM 12 95 each Name Address City State Zip Please add 2 00 for postage handling for each book ordered Payment must be in US funds 1 00 billing fee a orders from outside US and Canada must be prepaid
13. s D2 D3 D4 D4 D3 D2 RESULTS TRANSMIT FORMAT 0 0 0 7 bit word parity bit even 2 stop bits 0 0 1 7 bit word 1 parity bit odd 2 stop bits 0 1 0 7 bit word 1 parity bit even 1 stop bit 0 1 1 7 bit word 1 parity bit odd 1 stop bit 1 0 0 8 bit word 2 stop bits 1 0 1 8 bit word 1 parity bit even 1 stop bit 1 1 1 8 bit word 1 parity bit odd 1 stop bit Note For true RS232 voltage swings Cut foil b Pads shown if of board supply to Pin 7 of J3 Parts List RS232 OUT QI 2N3906 2N3904 R63 LOK 6 INOW R64 LOK R62 4 7K ROS 470 R66 LOK R72 1K Figure 1 files by name Chain BASIC programs from disk Up to 22 data files may be open simultaneously Resides at the beginning of RAM leaving maximum space for user programs Full trace of BASIC programs with optional single stepping Supports real time clock and tone generator True line editing allows you to correct mistakes easily Includes a disassembler and eight useful programs to de monstrate the power of the system Two BASIC subroutines add random access capability to disk files Satisfaction guaranteed or your money promptly refunded Documentation is clear and complete the best have seen from any source Ronald C Whitaker Compute magazine April 1981 Price 55 Manual and 5 4 inch diskette The 6502 Program Exchange 2920 West Moana Reno NV 89509 HOME OF THE FULL O SI GRAPHICS MICRO DATA rucut SI
14. ur cassette and 4800 baud for our printer with no hardware changes to go back and forth between them Bits D2 D3 and D4 select different combinations of word length parity and stop bits Table 2 gives their usage The monitor sets these bits such that we transmit 8 bits then 2 stop bits That setup works fine with my printer so I kept that format in my programming You will want to check the manual for your printer deter mine what format in which it needs to receive bits and program the ACIA accordingly Bits D5 D6 and D7 are used to program the IRQ and RTS functions which are not needed at this time so we will leave these bits cleared Therefore when you want to set up the ACIA to run the printer at 4800 baud you will first want to write the binary word 00000011 into hex addr F000 POKE61440 3 top reset the ACIA then write the binary word 00010000 into F000 POKE6 1440 16 to select the format and baud rate The Status Register will among many other things let us know when the Transmitter Register is ready to accept another word Bit 1 of the Status Register is the Transmistter Register Ready bit If it is set to 1 we can send another word to the Transmit Register F001 Two things will keep this bit from being set 1 If the ACIA has not yet transferred the last word that was written and 2 If the CTS line to the ACIA is high indication the peripheral cannot accept a word Although the Status Register has a bit D3 reser
15. ved to indicate the condition of the CTS line it will not be necessary to check it since it is going to inhibit D1 bit anyway The monitor ROM checks the Status Register prior to loading a word into the Transmit Register and will continue looping to check D1 in the Status Register until it finds it set then the monitor will load the word we want to transfer into the Transmit Register We need no extra programming to support our handshake signal as the monitor is already taking care of this for us How To Test We can now test our system to see if it is working properly We don t need to hook the printer up to make these checks in fact it will probably be better if we don t The first thing we should do is load a fairly long program into the system As it s loading notice the speed it is listing on the screen that s 300 baud Now from the keyboard type POKE71440 3 reset ACIA then type POKE61440 16 program ACIA Next type SAVE then LIST Now you should see the program listing at a speed 16 times faster than it is loaded at or 4800 baud Now as the program is listing connect your CTS input to either 5 volts or ground depending on how we configured it earlier such that you simulate a peripheral BUSY state The program should stop listing and not continue until we remove the input If these tests pass then we are ready to hook up our printer if the tests fail you will need to go back and recheck the hardware modificat
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