mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-27 12:49:27 +00:00
101 lines
1.8 KiB
Plaintext
101 lines
1.8 KiB
Plaintext
*
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SUBCOPY
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*
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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 :MLEN
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PLA
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STA :SCNT
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STA RETLEN
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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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LDA #<RETURN
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STA ADDR2
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LDA #>RETURN
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STA ADDR2+1
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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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LDA #0
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STA :S2LEN
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STA :SCERR
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LDA :SCNT
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BEQ :OKEXIT
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LDA :MLEN
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BEQ :EREXIT
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LDA :SINDEX
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BEQ :EREXIT
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LDY #0
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LDA (ADDR1),Y
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STA :S1LEN
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CMP :SINDEX
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BCC :EREXIT
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LDA :SINDEX
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CLC
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ADC :SCNT
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BCS :RECALC
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TAX
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DEX
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CPX :S1LEN
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BCC :CNT10K
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BEQ :CNT10K
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:RECALC
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LDA :S1LEN
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SEC
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SBC :SINDEX
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STA :SCNT
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INC :SCNT
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LDA #$0FF
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STA :SCERR
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:CNT10K
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LDA :SCNT
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CMP :MLEN
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BCC :CNT20K
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BEQ :CNT20K
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LDA :MLEN
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STA :SCNT
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LDA #$0FF
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STA :SCERR
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:CNT20K
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LDX :SCNT
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BEQ :EREXIT
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LDA #1
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STA :S2LEN
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:MVLP
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LDY :SINDEX
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LDA (ADDR1),Y
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LDY :S2LEN
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STA (ADDR2),Y
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INC :SINDEX
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INC :S2LEN
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DEX
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BNE :MVLP
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DEC :S2LEN
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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 :S2LEN
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LDY #0
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STA (ADDR2),Y
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STA RETLEN
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RTS
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:S1LEN DS 1
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:S2LEN DS 1
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:MLEN DS 1
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:SCNT DS 1
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:SINDEX DS 1
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:SCERR DS 1
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