>Here's my problem. The 16F84's program just fine, but cannot be read by
>the PP. I verified correct programming by desoldering the 'F84 and using
>a PICStart Plus. I carefully checked the PP wiring, but it appears fine,
>and the debug functions of the PP software work as expected. Not being
>able to read the chip means no verify. The boards are to be retested,
>but this test will not be able to tell the difference beteen the new and
>old PIC code. I could devise a new test, but the difference is only
>detectable after about 20 minutes of run time. Not an option.

I don't know if this is helpful to you, but I've found, when
switching from C84 to F84, using Parallax Complier & Programmer which
know nothing of the F84:

C84 can be verified if programmed with code protect on.
F84 *cannot* be verified if programmed with code protect on.

What I've done is program & verify with code protect off, then program with
code protect on and assume it programmed correctly.