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https://github.com/nathanriggs/AppleIIAsm-Collection.git
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34 lines
1.1 KiB
NASM
34 lines
1.1 KiB
NASM
*
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*``````````````````````````````*
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* DPRINT (NATHAN RIGGS) *
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* *
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* INPUT: *
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* *
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* WPAR1 = STRING ADDRESS (2B) *
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* *
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* OUTPUT: *
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* *
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* PRINT A ZERO-TERMINATED *
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* STRING AT A GIVEN ADDRESS. *
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* *
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* DESTROYS: NZCIDV *
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* ^^^ ^ *
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* *
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* CYCLES: 112+ *
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* SIZE: 13 BYTES *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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]ADDR1 EQU ZPW1 ; INDIRECT ADDRESS IS PASSED HERE
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*
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DPRINT
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*
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LDY #$00 ; {3C2B} RESET COUNTER {NZ}
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:LOOP
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LDA (]ADDR1),Y ; {6C2B} GET NEXT CHARACTER IN STRING {NZ}
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BEQ :EXIT ; {3C2B} IF CHAR = $00 THEN EXIT
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JSR COUT1 ; {89C3B} OTHERWISE, PRINT CHAR {NZCV}
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INY ; {2C1B} INCREAS COUNTER {NZ}
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BNE :LOOP ; {3C2B} IF COUNTER < 256, LOOP
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:EXIT
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RTS ; {6C1B} RETURN TO CALLING ROUTINE
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