mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-03 18:49:28 +00:00
c8cac53c5e
Massive updates that changes the way most subroutines are handled. Major bugfixes, various utilities added, started higher-level libraries.
87 lines
1.7 KiB
Plaintext
87 lines
1.7 KiB
Plaintext
MEMSWAP
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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 :LENGTH
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PLA
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STA ADDR1
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STA :A1
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PLA
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STA ADDR1+1
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STA :A1+1
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PLA
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STA ADDR2
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STA :A2
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PLA
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STA ADDR2+1
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STA :A2+1
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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 ADDR2+1
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CMP ADDR1+1
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BCS :CHKLO
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JMP :A1GTA2
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:CHKLO
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LDA ADDR2
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CMP ADDR1
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BCS :A2GTA1
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JMP :A1GTA2
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:A2GTA1
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LDA ADDR2 ;CALC DEST-SRC
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SEC
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SBC ADDR1
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TAX
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LDA ADDR2+1
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SBC ADDR1+1
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TAY
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TXA
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CMP :LENGTH
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TYA
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SBC :LENGTH+1
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BCS :ERREND
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JMP :OVF
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:A1GTA2
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LDA ADDR1
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SEC
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SBC ADDR2
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TAX
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LDA ADDR1+1
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SBC ADDR2+1
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TAY
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TXA
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CMP :LENGTH
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TYA
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SBC :LENGTH+1
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BCS :ERREND
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:OVF
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_ERR #:E_SID;#:E_OVF;#:E_DUMP;#:LENGTH;#6
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:ERREND
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LDY #255
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:LP
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INY
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LDA (ADDR1),Y
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TAX
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LDA (ADDR2),Y
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STA (ADDR1),Y
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TXA
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STA (ADDR2),Y
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CPY :LENGTH
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BNE :LP
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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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RTS
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:LENGTH DS 2
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:A1 DS 2
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:A2 DS 2
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:E_SID ASC "MEMSWAP (MSWAP MACRO)",00
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:E_DUMP ASC "DUMPING LENGTH (2) A1(2) A2(2)",00
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:E_OVF ASC "OVERFLOW! ADDRESSES OVERLAP.",00
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