piclist 1998\03\03\115208a >
Thread: Dumb question
face BY : Andrew Warren email (remove spam text)

Peter Baines <PICLISTspamRemoveMEMITVMA.MIT.EDU> wrote:

> does anybody have some code to subtract one 16 bit number from
> another NOT using 2s compliment so that it returns an ABS result
> with a flag (AKA register) to say if it is negative.


This routine computes DEST = DEST - SOURCE.  After it executes, the
Carry flag is valid (i.e., Carry = 0 if the result is negative,
Carry = 1 if the result is zero or positive).  Note that the Zero
flag is NOT necessarily valid after execution.



=== Andrew Warren - EraseMEfastfwdspamBeGonespamix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499
<199803031601.KAA14827@dfw-ix8.ix.netcom.com> 7BIT

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