mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-24 07:31:09 +00:00
210 lines
4.5 KiB
Plaintext
210 lines
4.5 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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STA :IDX
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DEC :AIDX
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DEC :IDX
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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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** GET ARRAY'S SIZE, ELEMENT SIZE
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*
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LDY #0
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LDA (ADDR4),Y
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STA :ASIZE
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LDY #1
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LDA (ADDR4),Y
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STA :ESIZE
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STA :ESIZEBAK
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*
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********************************
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*
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* ERROR CONTROL
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*
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********************************
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*
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LDA ERRCTRL
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CMP #1
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BEQ :CHKERR
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JMP :ERREND
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:CHKERR
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LDA :IDX ; IF IDX > ARRAY LENGTH
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CLC
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ADC #1
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CMP :ASIZE
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BCS :OVF
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JMP :ERREND
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:OVF
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_ERR :E_SID;:E_OVF1;:E_DUMP;:ESIZE;#9
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*
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********************************
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*
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:ERREND
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*
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********************************
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*
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** FIRST, MUL INDEX BY ELEM SIZE, THEN ADD
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** TWO TO GET THE ELEMENT ADDRESS.
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*
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LDY #0
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LDA #0
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STY SCRATCH
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STY SCRATCH+1
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BEQ :ENTLPA
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:DOADD
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CLC
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ADC :AIDX
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TAX
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TYA
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ADC SCRATCH
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TAY
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TXA
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:LPA
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ASL :AIDX
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ROL SCRATCH
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:ENTLPA
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LSR :ESIZE
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BCS :DOADD
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BNE :LPA
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*
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** STORE INDEX VALUE
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*
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STX :IDX
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STY :IDX+1
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*
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** NOW ADD TWO TO RESULT
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*
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CLC
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LDA #2
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ADC :IDX
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STA :RES
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LDA #0
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ADC :IDX+1
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STA :RES+1
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*
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** NOW ADD RESULT TO THE BASE ARRAY ADDRESS
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** TO GET THE ELEMENT ADDRESS
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*
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CLC
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LDA :RES
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ADC ADDR4
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STA :RES
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LDA :RES+1
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ADC ADDR4+1
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STA :RES+1
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*
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STA ADDR2+1
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LDA :RES
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STA ADDR2
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*
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** COPY FROM SRC ADDR3 TO ELEMENT LOCATION ADDR
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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 :ESIZEBAK
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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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RTS
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*
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** DATA
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*
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:ESIZE DS 1
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:ESIZEBAK DS 1
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:ASIZE DS 1
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:AIDX DS 2
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:IDX DS 2
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:RES DS 2
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*
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:E_SID ASC "APUT81 (PUT81 MACRO)",00
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:E_DUMP ASC "DUMPING :ESIZE(1) :ESIZEBAK(1) :ASIZE(1)"
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ASC ":AIDX(2) :IDX(2) :RES(2)",00
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:E_OVF1 ASC "OUT OF BOUNDS! INDEX > ARRAY LENGTH",00
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*
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