> Disassembly of the non-working code (with comments I've now added).
> 0xc0 and 0xbf are the upper and lower bytes of S2 resp.

Why are you using a 16-bit variable instead of an 8-bit (unsigned) variable=
?

The subwfb instruction is correct - you do want to subtract the borrow
from the most significant byte calculation. What is confusing me is
the MOVLW 0xff. If I were writing this in assembly, I would use MOVLW
0x00.

-Scott
--=20
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