mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-12 01:30:00 +00:00
71 lines
2.3 KiB
Plaintext
71 lines
2.3 KiB
Plaintext
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*
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*``````````````````````````````*
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* XPRINT :: SPECIAL PRINT *
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*- -*
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* PRINTS DATA IMMEDIATELY *
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* FOLLOWING THE JSR TO SPRINT *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: NZC----- REG: AYM- *
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*- -*
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* CYCLES: 53+ *
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* SIZE: *
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*- -*
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* USAGE: *
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* JSR SPRINT *
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* ASC "HELLO, WORLD!" *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* A,Y = LOW BYTE OF ADDRESS *
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* X = UNCHANGED *
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*- -*
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* NOTE: PARTIALLY ADOPTED FROM *
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* ROGER WAGNER'S AND CHRIS *
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* TORRENCE'S /ASSEMBLY LINES/ *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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XPRINT
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*
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** GET CURRENT EXEC ADDRESS
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*
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PLA
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STA ADDR1
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PLA
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STA ADDR1+1
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*
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LDY #$01 ; POINT TO NEXT
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; INSTRUCTION
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:LOOP
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LDA (ADDR1),Y
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BEQ :DONE
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JSR COUT1
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INY
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BNE :LOOP
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:DONE ; RESTORE STACK
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CLC ; EXEC POINTER
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TYA ; TO RESUME
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ADC ADDR1
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STA ADDR1
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LDA ADDR1+1
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ADC #$00
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PHA
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LDA ADDR1
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PHA
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RTS
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:EXIT
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*
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