mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-27 12:49:27 +00:00
122 lines
2.1 KiB
Plaintext
122 lines
2.1 KiB
Plaintext
*
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SUBINS
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*
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PLA
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TAY
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PLA
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TAX
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PLA
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STA ADDR2
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PLA
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STA ADDR2+1
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PLA
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STA :MLEN
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PLA
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STA :SINDEX
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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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TXA
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PHA
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TYA
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PHA
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LDA #0
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STA :SCERR
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LDY #0
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LDA (ADDR1),Y
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STA :S1LEN
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LDA (ADDR2),Y
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STA :S2LEN
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BNE :IDX0
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JMP :OKEXIT
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:IDX0
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LDA :SINDEX
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BNE :CHKLEN
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JMP :EREXIT
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:CHKLEN
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LDA :S2LEN
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CLC
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ADC :S1LEN
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BCS :TRUNC
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CMP :MLEN
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BCC :IDXLEN
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BEQ :IDXLEN
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:TRUNC
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LDA :MLEN
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SEC
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SBC :S1LEN
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BCC :EREXIT
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BEQ :EREXIT
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STA :S2LEN
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LDA #$0FF
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STA :SCERR
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:IDXLEN
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LDA :S1LEN
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CMP :SINDEX
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BCS :LENOK
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LDX :S1LEN
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INX
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STX :SINDEX
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LDA #$0FF
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STA :SCERR
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LDA :S1LEN
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CLC
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ADC :S2LEN
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STA :S1LEN
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JMP :MVESUB
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:LENOK
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LDA :S1LEN
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SEC
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SBC :SINDEX
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TAX
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INX
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LDA :S1LEN
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STA :SIDX
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CLC
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ADC :S2LEN
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STA :SBIDX
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STA :S1LEN
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:OPNLP
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LDY :SIDX
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LDA (ADDR1),Y
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LDY :SBIDX
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STA (ADDR1),Y
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DEC :SIDX
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DEC :SBIDX
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DEX
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BNE :OPNLP
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:MVESUB
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LDA #1
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STA :SIDX
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LDX :S2LEN
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:MVELP
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LDY :SIDX
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LDA (ADDR2),Y
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LDY :SINDEX
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STA (ADDR1),Y
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INC :SIDX
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INC :SINDEX
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DEX
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BNE :MVELP
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LDA :SCERR
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BNE :EREXIT
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:OKEXIT
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CLC
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BCC :EXIT
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:EREXIT
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SEC
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:EXIT
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LDA :S1LEN
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LDY #0
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STA (ADDR1),Y
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RTS
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:S1LEN DS 1
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:S2LEN DS 1
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:SUBLEN DS 1
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:MLEN DS 1
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:SINDEX DS 1
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:SIDX DS 1
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:SBIDX DS 1
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:SCERR DS 1
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