Quozl wrote a stack math package for the PIC 12C509 processor. The
code contains contains addition, subtraction, multiplication and
division code for 16-bit signed integers, using a first in last out
data stack based on the FSR and INDF registers. It aims for
efficiency of file register space rather than code space
efficiency. Full documentation is in the source file.
PIC 12C509 Stack Math Package
(20 February 2001)