mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-11 09:49:17 +00:00
ad58479739
- major bugfixes, especially in 2D arrays - separated each subroutine into own file - reconfigured arrays to use 1-based indexing - Arrays.demo uses macros now - added overflow error handling to get and put routines
93 lines
2.1 KiB
Plaintext
93 lines
2.1 KiB
Plaintext
ADIM81
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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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PLA
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STA :FILL ; FILL VALUE
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PLA
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STA :ESIZE ; ELEMENT SIZE
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STA :ESZBAK
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PLA
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STA :ASIZE ; ARRAY SIZE
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STA :ASZBAK
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PLA
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STA ADDR1 ; ARRAY ADDRESS
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PLA
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STA ADDR1+1
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LDY #0
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LDA #0
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STY SCRATCH
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BEQ :ENTLP
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:DOADD
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CLC
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ADC :ASIZE
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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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:LP
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ASL :ASIZE
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ROL SCRATCH
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:ENTLP
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LSR :ESIZE
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BCS :DOADD
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BNE :LP
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CLC
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INX
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INX ; INCREASE BY TWO
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; TO MAKE ROOM FOR SIZES
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BCC :NOINY ; IF .X ROLLS OVER, INC .Y
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INY
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:NOINY
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STX :MSIZE ; LOW BYTE
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STY :MSIZE+1 ; HIGH BYTE
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LDA :FILL ; FILL VALUE
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LDX :MSIZE+1
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BEQ :PART ; IF NO WHOLE PAGES, JUST PART
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LDY #0
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:FULL
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STA (ADDR1),Y
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INY ; NEXT BYTE
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BNE :FULL ; LOOP UNTIL PAGE DONE
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INC ADDR1+1 ; GO TO NEXT PAGE
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DEX
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BNE :FULL ; LOOP IF PAGES LEFT
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:PART
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LDX :MSIZE ; PARTIAL PAGE BYTES
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BEQ :MFEXIT ; EXIT IF = 0
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LDY #0
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:PARTLP
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STA (ADDR1),Y ; STORE VAL
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INY ; INC INDEX
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DEX ; DEC COUNTER
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BNE :PARTLP ; LOOP UNTIL DONE
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:MFEXIT
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LDY #0
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LDA :ASZBAK
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STA (ADDR1),Y
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INY
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LDA :ESZBAK
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STA (ADDR1),Y
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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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LDY ADDR1 ; LOW
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LDX ADDR1+1 ; HIGH
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LDA :ASZBAK
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LDA :MSIZE
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STA RETURN
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LDA :MSIZE+1
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STA RETURN+1
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LDA #2
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STA RETLEN ; 2 BYTE LENGTH
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RTS
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:MSIZE DS 2
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:ASIZE DS 1
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:ESIZE DS 1
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:ASZBAK DS 1
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:ESZBAK DS 1
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:FILL DS 1
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