mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-12 16:29:26 +00:00
102 lines
2.1 KiB
Plaintext
102 lines
2.1 KiB
Plaintext
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MEMMOVE
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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 :MVELEN
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PLA
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STA :MVELEN+1
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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 ADDR1
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PLA
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STA ADDR1+1
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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 :MVELEN
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TYA
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SBC :MVELEN+1
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BCS :DOLEFT
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JSR :MVERHT
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JMP :EXIT
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:DOLEFT
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JSR :MVELEFT
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:EXIT
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JMP :MREXIT
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:MVELEFT
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LDY #0
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LDX :MVELEN+1
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BEQ :MLPART
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:MLPAGE
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LDA (ADDR1),Y
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STA (ADDR2),Y ;MOVE ONE BYTE
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INY
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BNE :MLPAGE
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INC ADDR1+1
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INC ADDR2+1
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DEX
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BNE :MLPAGE
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:MLPART
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LDX :MVELEN
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BEQ :MLEXIT
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:MLLAST
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LDA (ADDR1),Y
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STA (ADDR2),Y
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INY
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DEX
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BNE :MLLAST
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:MLEXIT
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JMP :MREXIT
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:MVERHT
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LDA :MVELEN+1
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CLC
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ADC ADDR1+1
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STA ADDR1+1 ;POINT TO LAST P OF SRC
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LDA :MVELEN+1
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CLC
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ADC ADDR2+1
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STA ADDR2+1
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LDY :MVELEN ;GET LENGTH OF LAST PAGE
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BEQ :MRPAGE
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:MR0
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DEY
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LDA (ADDR1),Y
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STA (ADDR2),Y
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CPY #0
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BNE :MR0
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:MRPAGE
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LDX :MVELEN+1
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BEQ :MREXIT
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:MR1
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DEC ADDR1+1
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DEC ADDR2+1
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:MR2
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DEY
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LDA (ADDR1),Y
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STA (ADDR2),Y
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CPY #0
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BNE :MR2
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DEX
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BNE :MR1
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:MREXIT
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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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:MVELEN DS 2
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