You can also try:

http://www.best.com/~mcrosbie/projects/Electronics/PIC/MyCode/flash.html
There is asmbler code and a schematic there.  A tip o' my hat to Mark
Crosbie for this page.

Michael

*************************************************************************When th
e way of the Tao is forgotten, kindness and ethics must be taught.
Men must learn to pretend to be wise and good.  --  Lao Tzu
*************************************************************************