Your Commodore - Commodore Is Awesome

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DISC DRIVE E125v1x1T Enhancer 2000 and bundled word processor *On sale in computer stores across the USA *CBM64, Plus 4 compatible *Super high speed—it's fast *1 year warranty— it's reliable *Does not use any computer memory—it's smart *FREE SOFTWARE worth £50 *51/4" DD *E143.75 plus E5 p&p. Total E148.75 FIRSTLINE SOFTWARE <strong>Your</strong> fi rstline of supplies Write for full details or phone Access 0480 213969 Cheques payable to R.E. Ltd., 206 Great North Road, Eaton Socon, St. Neots, Cambs. FE19 3EF. MAGNAM PRODUCTS INTERNATIONAL LTD. EXTENDED BASIC DISK TURBO TAPE TURBO MACHINE CODE MONITOR PRINTER INTERFACE RESET AND FREEZE TAPE AND DISK BACKUP TAPE TO DISK CONVERSION 42 PAGE MANUAL 27 extra commands, AUTO, AUDIO, COLOR, DEEK, DELETE, DOKE, DUMP, FIND. HARDCAT, HARDCOPY, HEX$. INFO. KEY, PAUSE, PLIST, ILOAD, RENUMBER, REPEAT, SAFE, TRACE, UNNEW. QUIT, MONITOR, BLOAD RENUMBER: Also modifies all the GOTO's GOSUB's etc. Allows part of a programme to be renumbered or displaced. PSET• Set up of printer type. HARDCAT• Prints out Directory. Loads & Saves tape 10 times faster and disc six times leaves all of your <strong>Commodore</strong> memory available for programming Also works in EA.31C-ROM. KERNAL and I/0 areas A Assemble: C Compare; D Disassemble; F Fill; G Go, H Hunt; I Interpret. J Jump; L Load, M Memory: P Print; R Register, S Save; T Transfer; V Verify; %IV Walk; X Exit: • Directory DOS Commands Compatible with Serial/Centronics Printers The HARD COPY function automatically distinguishes between HIRES and LORES Multicolour graphics are converted intogrades of grey. The PSET functions allow you to decide on Large/Small and Normal/Inverse printing. Press Reset button and SPECIAL MENU apears on screen CONTINU - Allows you to return to your program BASIC - Return to BASIC RESET - Normal RESET TOTAL BACKUP DISK- Saves the contents of the memory onto a Disk The programme can be reloaded later with BLOAD followed by CONTINUE. RESET ALL - RESET any of programme. TOTAL BACKUP TAPE - As BACKUP DISK but to TAPE. HARDCOPY At any moment. prints out a Hardcopy of the screen. Using CONTINUE afterwards you can return to the program, MONITOR Takes you into the Machine language Monitor_ BLANK DISCS E8.6 9 ar 10 discs per box *Double sided, double density *Hub reinforced, 100% certification, 2 notches and index holes. Ring now for great service and double storage. *L9.99 plus El p&p/box bike les Pew* Care, e le s best men!, beteuse 'I S sab e r Cu use then the g M i Y I-111 . 1 ; 47 , 4:r / 2 7 , / , ,
I n data can be input into your code by t means of the ROM routines. h The trivial method of inputing data is to POKE values into the relevant i locations used by the code. This s method is good enough and may be amandatory if you're using a Basic rdriver program and you want to use a tcompiler. Those of you with more i refined taste will want something better. c One of the most important routines lin the Basic ROM starts at $AD9F• eThis evaluates input expressions and , checks the syntax. There are a large I number of entry points to this routine w which can be used for our benefit. a n Getting into M/C t tThere are two commands for the o accessing of machine code from Basic. cFirst we have the USR command. It's ofuill syntax is: n s Variable — USR(expression) i The expression within the brackets is devaluated and stored in FAC/1 e(floating point accumulator no I). This r value is then used in your code. The hentry point of your code must fi orst stored bin ethe vector in locations $0310 to $0312. On leaving the routine, the wvalue in FAC/1 is transferred to the variable in the calling instruction. Since you can only pass one parameter, this instruction is of limited value. The more frequently used command is SYS. This simply calls the machine code starting at the specified MACHINE CODE Welcome to the Machine ROM routines revealed. Read on to find out how to input data into your machine code By Allen Webb address. Since SYS doesn't support parameters, we must use some coding to add them. The most usual syntax adopted is of the form: SYS address, parameter 1, parameter 2,.. „etc After your code is entered, the Basic text pointer is pointing at the character after the SYS. We can check this character using four routines: I LISTING 2 40 CHKCOMMA $AEFD 50 CHKLPAR = $AEFA 60 CHKRPAR = $AEF7 70 EVALTERM $AD8A 80 FLPTOINT = $B7F7 85 CHKCHAR = $AEFF 90 PARAM1 = $AA 95 PARAM2 = $F8 100 JSR CHKCOMMA IS 1ST COMMA THERE ? 110 JSR CHKLPAR OPEN BRACKET ? • 120 JSR EVALTERM ; YES — GET VALUE 130 JSR FLPTOINT 140 LDA $14 ; AND SAVE IT IN 150 STA PARAM1 RESULT 1 160 LDA $15 170 STA PARAM11-1 180 JSR CHKRPAR CLOSING BRACKET ? 190 JSR CHKCOMMA NEXT COMMA ? 200 JSR EVALTERM YES — GET VALUE 205 JSR FLPTOINT 210 LDA $14 ; SAVE IT IN 220 STA PARAM2 RESULT2 230 LDA $15 240 STA PARAM24-1 250 RTS YOUR COMM(MORE november 1986:85 $AEF7 — check that character is a right bracket SAEFA — check that character is a left bracket SAUD — check that character is a comma $AEFF check that character is that held in the accumulator These routines give a SYNTAX ERROR if the character is not that sought. If the character is correct, the 1
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Page 35 and 36: C64 REVIEWS The Newsralcom Desi91 -
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Page 45 and 46: Maintenance, Service. Support. Trai
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Page 49 and 50: ROJAN THE ULTIMATE IN GRAPHICS TOOL
Page 51 and 52: RAD 28 95 AMSTRAD POW DISK 1945 ATA
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Page 55 and 56: 1 Games Reviews COLLAPSE REVIEWS Th
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Page 63 and 64: THE FINAL CARTRIDGEI I MO IMO oroYo
Page 65 and 66: HARDWARE REVIEWS Pick of the Sticks
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Page 75 and 76: EPILOG-I CARTRIDGE SYSTEM COMMODORE
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Page 95 and 96: Lineage: 45p per word. (52p incl. V
Page 97 and 98: SOFTWARE LIBRARY MIDLAND COMPUTER L
Page 100: k_ *8 digitally recorded drum sound
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