Hi Roger,

Good “quest”.
You may have already seen these items on the Microchip web site.

http://www.microchip.com

AN910 - PICmicro® Device Programming: What You Always Wanted to Know (But Didn’t Know Who to Ask)
http://ww1.microchip.com/downloads/e...tes/00910a.pdf

Programming Specification:
PIC16F87XA Programming Specifications
http://ww1.microchip.com/downloads/e...Doc/39589b.pdf

In-Circuit Serial Programming? (ICSP™) Guide
http://ww1.microchip.com/downloads/e...Doc/30277d.pdf

-Adam-