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32 lines
629 B
Plaintext
32 lines
629 B
Plaintext
SUBT16
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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 :SUBT
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PLA
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STA :SUBT+1 ; SUBTRAHEND
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PLA
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STA :MINU
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PLA
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STA :MINU+1 ; MINUEND
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LDA :MINU
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SEC
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SBC :SUBT
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TAY ; LOW BYTE
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STY RETURN
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LDA :MINU+1
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SBC :SUBT+1
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TAX ; HIGH BYTE
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STX RETURN+1
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LDA #2
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STA RETLEN
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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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:MINU DS 2
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:SUBT DS 2
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