Hi Jim
If possible take a look at the pic18f2550 it is pin compatible with the PIC16C745. The PIC16C745 is obsolete and can only be programmed one time. Do you have the source code we could help you convert it? If you are in the U.S. and get stuck I can probably help you flash those, but I will be away until July 7.
Mark
Add:
I have a MElabs U2 programmer which still supports the pic 16c745. It's expensive but well worth the cost if you plan on
working with pics in the future. It has a great configuration feature.
http://store.melabs.com/prod/u2/U2.html
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