Pardon my laziness, but does anyone have code to share which allows a
PIC17C42 to write to its own EPROM?  In other words, I will have some code
already in the PIC, plus some unprogrammed space that I want to program
later, after the part is installed in the target circuit.  (Basically, I'd
like to replicate self-programming ROM code that is built into the 17C4X).
I understand the TABLWT and TLWT instructions, but the programming
specification indicates an EPROM-burning algorithm in which you might have
to write an EPROM location several times until it reads back correct, and
then burn it 3 times that much more.  Has anyone out there worked this out?

Peter F. Klammer, Racom Systems Inc.                   PKlammer@ACM.Org
6080 Greenwood Plaza Boulevard                            (303)773-7411
Englewood, CO  80111                                  FAX:(303)771-4708

Peter F. Klammer, Racom Systems Inc.                   PKlammer@ACM.Org
6080 Greenwood Plaza Boulevard                            (303)773-7411
Englewood, CO  80111                                  FAX:(303)771-4708