Hi all

thanks a lot for your precious suggestions. I've just tried to upgrade my PRO MATE II device programmer with the last OS firmware. This is confirmed by noting that the device programmer recognizes my PIC16F877A.
I know the problem is to execute a Bulk erase. In the ICSP guide from Microchip there is a suggestion for erasing code protected memory:
1. execute a Load configuration command with a "1" in all locations...
2.execute increment address...
3.execute a Bulk erase setup1...
4.execute a Bulk erase setup2...
5.execute a begin erase/programming...
6.wait 8 msec...
7.execute a Bulk erase setup1...
8.execute a Bulk erase setup2...

Have you an idea where I can find the source file to do it?(how to translate this suggestion in assembler or hex code)

Many thanks