mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2025-02-21 04:29:15 +00:00
875dd80998
- fixed a bunch of bugs - separated common and stdio libraries - commenting upgrades - created min versions of each library
128 lines
3.0 KiB
Plaintext
128 lines
3.0 KiB
Plaintext
*
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*``````````````````````````````*
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* APUT81 : PUT DATA INTO ARRAY *
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* ELEMENT *
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*- -*
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* COPIES FROM SOURCE LOCATION *
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* AND PUTS IT IN MEMLOC FOR *
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* DESIRED ELEMENT. *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ????---- REG: AXYM *
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*- -*
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* CYCLES: ??? *
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* SIZE: *
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*- -*
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* USAGE: *
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* *
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* LDA #>$300 ; SRC ADDR *
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* PHA *
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* LDA #<$300 *
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* PHA *
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* LDA #>$300 ;DEST ADDR *
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* PHA *
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* STA #<$300 *
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* PHA *
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* LDA #5 ; INDEX *
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* PHA *
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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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* INDEX OF PUT ELEMENT *
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* LOW BYTE OF DESTINATION ADDR *
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* HI BYTE OF DESTINATION ADDR *
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* LO BYTE OF SOURCE ADDRESS *
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* HI BYTE OF SOURCE 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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* .Y = LOBYTE OF ELEMENT ADDR *
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* .X = HIBYTE OF ELEMENT ADDR *
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* .A = BYTE LENGTH OF ELEMENT *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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APUT81
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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 ; LOCAL RETURN ADDRESS STORAGE
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PLA ; BECAUSE OF CALLING AGET81
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STA :RETADR+1
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*
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** GET PARAMETERS
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*
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PLA
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STA :AIDX
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PLA
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STA ADDR4 ; ARRAY ADDRESS; USES ADDR4
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; BECAUSE CALL TO AGET81 USES
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; ADDR1
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PLA
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STA ADDR4+1
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PLA
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STA ADDR3 ; ADDRESS OF DATA TO BE
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; COPIED TO ELEMENT
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PLA
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STA ADDR3+1
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*
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LDA ADDR4+1
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PHA
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LDA ADDR4
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PHA
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LDA :AIDX
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PHA
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JSR AGET81 ; GET MEMORY POS OF ELEM
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STY ADDR2
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STX ADDR2+1
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*
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** GET ARRAY'S ELEMENT SIZE
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*
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LDY #1
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LDA (ADDR4),Y
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STA :ESIZE
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LDY #0
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*
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** COPY FROM ADDR1 TO ADDR2
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*
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:LP
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LDA (ADDR3),Y
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STA (ADDR2),Y
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INY
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CPY :ESIZE
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BNE :LP
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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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** RETURN ELEMENT ADDRESS AND SIZE
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** IN REGISTERS
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*
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LDX ADDR2+1
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LDY ADDR2
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LDA :ESIZE
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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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:ESIZE DS 1
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:ASIZE DS 1
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:AIDX DS 1
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*
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