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by windenntw
21 days ago
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Here is one in plain 68000 assembler. move.b #200,d0
move.b #100,d1
add.b d0,d1 ; 8th bit goes to X flag
subx.b d0,d0 ; d0 = $00 or $ff depending on X flag
or.b d0,d1 ; d1 = 255 if there was saturation
You can do the same with all others that somehow store
the 8th bit carry somewhere then allow using it for substraction. |
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