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The ADC instruction does not distinguish between signed or unsigned operands.
Instead, the processor evaluates the result for both data types and sets
OF flag to indicate a carry out from the signed result.
CF flag to indicate a carry out from the unsigned result.
The sign flag SF indicates the sign of the signed result.
The ADC instruction is usually executed as part of a chained multibyte or multiword addition, in which an ADD or ADC instruction is followed by another ADC instruction.
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