mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-28 03:52:10 +00:00
875dd80998
- fixed a bunch of bugs - separated common and stdio libraries - commenting upgrades - created min versions of each library
134 lines
3.2 KiB
Plaintext
134 lines
3.2 KiB
Plaintext
*
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*``````````````````````````````*
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* APUT82 : PUT DATA INTO ELEM *
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*- -*
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* THIS PUTS DATA FROM ONE ADDR *
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* INTO THE ADDRESS OF AN ARRAY *
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* WITH THE INDEX OF [:XIDX], *
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* [:YIDX]. *
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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 ; SOURCE DATA *
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* PHA *
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* LDA #<$300 *
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* PHA *
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* LDA #>$3A0 ; DEST ARRAY *
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* PHA *
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* LDA #<$3A0 *
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* PHA *
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* LDA #2 ; ELEM X INDEX *
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* PHA *
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* LDA #3 ; ELEM Y INDEX *
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* PHA *
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* JSR APUT82 *
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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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* ELEMENT Y INDEX *
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* ELEMENT X INDEX *
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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 ELEMENT ADDRESS *
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* .X = HIBYTE ELEMENT ADDRESS *
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* .A = ELEMENT BYTE LENGTH *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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APUT82
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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 BECAUSE OF
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PLA ; CALLING AGET82
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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 :YIDX ; Y INDEX
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PLA
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STA :XIDX ; X INDEX
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PLA
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STA ADDR4 ; ADDRESS OF ARRAY
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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
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PLA ; TO BE COPIED
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STA ADDR3+1
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*
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** NOW RUN AGET82 TO GET PROPER ADDRESS
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*
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LDA ADDR4+1 ; ARRAY ADDRESS
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PHA
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LDA ADDR4
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PHA
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LDA :XIDX ; X INDEX
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PHA
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LDA :YIDX ; Y INDEX
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PHA
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JSR AGET82
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STY ADDR2 ; STORE ADDRESS OF INDEX
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STX ADDR2+1 ; IN ZERO PAGE
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*
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** GET ARRAY ELEMENT SIZE
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*
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LDY #2
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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 SRC ADDR TO DEST ADDR
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*
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:CLP
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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 :CLP
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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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*
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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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:XIDX DS 1
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:YIDX DS 1
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*
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