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https://github.com/nathanriggs/AppleIIAsm-Collection.git
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43 lines
693 B
Plaintext
43 lines
693 B
Plaintext
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MULT8
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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 :MUL1
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PLA
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STA :MUL2
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LDA #$00
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TAY
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TAX
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STY :MUL1H
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BEQ :GOLOOP
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:DOADD
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CLC
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ADC :MUL1
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TAY
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TXA
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ADC :MUL1H
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TAX
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TYA
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:LP
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ASL :MUL1
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ROL :MUL1H
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:GOLOOP
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LSR :MUL2
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BCS :DOADD
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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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STY RETURN
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STX RETURN+1
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LDA #2
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STA RETLEN
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RTS
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:MUL1 DS 1
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:MUL2 DS 1
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:MUL1H DS 1
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