I haven't touched a PIC in a while, but I vaguely remember a lot of problems with negative math on the 16F family.
Wasn't there a thread here somewhere about something like DT's interrupt stuff but about negative math?
(searching...)
Robert
EDIT: Like this thread:
http://www.picbasic.co.uk/forum/showthread.php?t=7777
"...PBP can't multiply or divide negative numbers. (unless you are using PBPL on an 18F) - DT"
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