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https://github.com/nathanriggs/AppleIIAsm-Collection.git
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37 lines
1.3 KiB
NASM
37 lines
1.3 KiB
NASM
*``````````````````````````````*
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* PRNSTR (NATHAN RIGGS) *
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* *
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* INPUT: *
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* *
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* .A = ADDRESS LOBYTE *
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* .X = ADDRESS HIBYTE *
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* *
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* OUTPUT: *
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* *
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* PRINTS STRING TO SCREEN. *
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* *
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* DESTROY: NZCIDV *
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* ^^^ ^ *
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* *
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* CYCLES: 129+ *
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* SIZE: 23 BYTES *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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]STRLEN EQU ZPB1 ; STRING LENGTH
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*
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PRNSTR
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*
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STA ZPW1 ; {3C2B} STORE ADDRESS IN ZERO PAGE
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STX ZPW1+1 ; {3C2B} STORE ADDRESS IN ZERO PAGE
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LDY #0 ; {2C2B} RESET INDEX {NZ}
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LDA (ZPW1),Y ; {6C2B} GET STRING LENGTH {NZ}
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STA ]STRLEN ; {3C2B} AND STORE IT IN MEM
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:LP
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INY ; {2C1B} INCREASE INDEX {NZ}
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LDA (ZPW1),Y ; {6C2B} GET CHARACTER {NZ}
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JSR COUT1 ; {89C3B} PRINT CHARACTER TO SCREEN {NZCV}
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CPY ]STRLEN ; {3C2B} IF Y < LENGTH {NZ}
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BNE :LP ; {3C2B} THEN LOOP; ELSE
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LDA ]STRLEN ; {3C2B} LOAD STRING LENGTH {NZ}
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RTS ; {6C1B} RETURN TO CALLING ROUTINE
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