Atari Assembler Editor - Example Code

Example Code

The following is example code for Hello World! written in Atari assembly language:

10 ; HELLO.ASM 20 ; --------- 30 ; 40 ; THIS ATARI ASSEMBLY PROGRAM 50 ; WILL PRINT THE "HELLO WORLD" 60 ; MESSAGE TO THE SCREEN 70 ; 0100 ; CIO EQUATES 0110 ; =========== 0120 *= $0340 ;START OF IOCB 0130 IOCB 0140 ; 0150 ICHID *= *+1 ;DEVICE HANDLER 0160 ICDNO *= *+1 ;DEVICE NUMBER 0170 ICCOM *= *+1 ;I/O COMMAND 0180 ICSTA *= *+1 ;I/O STATUS 0190 ICBAL *= *+1 ;LSB BUFFER ADDR 0200 ICBAH *= *+1 ;MSB BUFFER ADDR 0210 ICPTL *= *+1 ;LSB PUT ROUTINE 0220 ICPTH *= *+1 ;MSB PUT ROUTINE 0230 ICBLL *= *+1 ;LSB BUFFER LEN 0240 ICBLH *= *+1 ;MSB BUFFER LEN 0250 ICAX1 *= *+1 ;AUX BYTE 1 0260 ICAX2 *= *+1 ;AUX BYTE 1 0270 ; 0280 GETREC = 5 ;GET TEXT RECORD 0290 PUTREC = 9 ;PUT TEXT RECORD 0300 ; 0310 CIOV = $E456 ;CIO ENTRY VECTOR 0320 RUNAD = $02E0 ;RUN ADDRESS 0330 EOL = $9B ;END OF LINE 0340 ; 0350 ; SETUP FOR CIO 0360 ; ------------- 0370 *= $0600 0380 START LDX #0 ;IOCB 0 0390 LDA #PUTREC ;WANT OUTPUT 0400 STA ICCOM,X ;ISSUE CMD 0410 LDA #MSG&255 ;LOW BYTE OF MSG 0420 STA ICBAL,X ; INTO ICBAL 0430 LDA #MSG/256 ;HIGH BYTE 0440 STA ICBAH,X ; INTO ICBAH 0450 LDA #0 ;LENGTH OF MSG 0460 STA ICBLH,X ; HIGH BYTE 0470 LDA #$FF ;255 CHAR LENGTH 0480 STA ICBLL,X ; LOW BYTE 0490 ; 0500 ; CALL CIO TO PRINT 0510 ; ----------------- 0520 JSR CIOV ;CALL CIO 0530 RTS ;EXIT TO DOS 0540 ; 0550 ; OUR MESSAGE 0560 ; ----------- 0570 MSG .BYTE "HELLO WORLD!",EOL 0580 ; 0590 ; INIT RUN ADDRESS 0600 ; ---------------- 0610 *= RUNAD 0620 .WORD START 0630 .END

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