>> 'result' is the difference between two numbers. I'm still working
>> through a C transcription and haven't run it yet, but now I
>> realise at least one of those numbers must be 24-bit.
>=20
> Not if you only want to determine >, <, overflow, etc of a subtract
> on 16 bit numbers

Yes, you're right. I was thinking that the bit to check was in the
3rd byte of a variable, but as you point out ....

> See the table of BRA instructions

.... the conditional flow instructions have been expanded, and
include those which are otherwise pseudo-ops (bc, bn etc) for
testing math results

So that's today's schedule sorted out ;-)

Joe
--=20
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