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(nasm.info)Section B.4.284

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B.4.284. `SALC': Set AL from Carry Flag
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     SALC                          ; D6                  [8086,UNDOC]

   `SALC' is an early undocumented instruction similar in concept to
`SETcc' (*Note Section B.4.287::). Its function is to set `AL' to zero
if the carry flag is clear, or to `0xFF' if it is set.