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https://github.com/nathanriggs/AppleIIAsm-Collection.git
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83 lines
2.3 KiB
Plaintext
83 lines
2.3 KiB
Plaintext
*
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*``````````````````````````````*
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* DPRINT :: PRINT FROM MEMORY *
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*- -*
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* PRINTS DATA FROM SPECIFIED *
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* MEMORY LOCATION UNTIL *
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* REACHING 00 (STRING TERM). *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: -------- REG: A-YM *
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*- -*
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* CYCLES: 25+ *
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* SIZE: *
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*- -*
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* USAGE: *
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* LDA #>(ADDRESS) *
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* PHA *
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* LDA #<(ADDRESS) *
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* PHA *
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* JSR DPRINT *
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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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* LOW BYTE OF PRINT ADDRESS *
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* HI BYTE OF PRINT 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 = LOW BYTE OF ADDRESS *
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* X = UNCHANGED *
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* Y = LENGTH OF PRINTED *
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* STRING *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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DPRINT
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*
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** SAVE RETURN ADDRESS
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*
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PLA
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STA :RETADR
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PLA
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STA :RETADR+1
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*
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** GET ADDRESS, STORE IN ZERO PAGE
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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 #$00
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:LOOP
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LDA (ADDR1),Y
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BEQ :EXIT
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JSR COUT1
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INY
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BNE :LOOP
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:EXIT
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*
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** RESTORE RETURN ADDRESS
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*
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LDA :RETADR+1
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PHA
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LDA :RETADR
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PHA
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*
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RTS
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*
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** DATA
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*
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:RETADR DS 2
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*
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