Is there any simple way to check if the program in a PIC
(16C57) is corrupt?

Since the program memory can't be read by the program
itself it's impossible to check it with a checksum. Is there
any other way?

I could put RETLW XX at several locations, where XX is a
known constant, and then call these locations to see if I get
the expected value in return but this doesn't check the
entire program.

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Ruben Joensson
AB Liros Elektronik
Box 9124
200 39 Malmoe
Sweden
Tel +46 40 14 20 80
Mail: ruben@sbbs.se
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