pic

pros and cons of pic (picaxe)
This link with pic tag added to crossref to the mikeh2 created.

em78p156
some help with em78p156
PIC 16C54/55/56
some more help with em78p156
Some time ago I someone donated a 'robot' kit which has an emp78156 and 3 LTH-1550-01 .
I can't find much useful info on the PIC but the photo interrupters could be useful.

Picaxe Australia
modern chip labels
see also this for engraved names

placeholder for more PICAXE programs
that is a place to collect existing code that was used for teaching and/or demonstration
that has been languishing on hard drives around my place.

In earlier times I was interested in PIC chip programming and for a while taught the programming of such to secondary school students. This was an advanced IC.

Support/Documents
USB micro-controller module including schematic
USBview from here is useful.