I upped the rate to 100M@200KHz.

(the bottom PC is the one that programs properly)

This is the start of the programming step:

Name:  U2 pgm 16F877 Easy Quiz - Pgm start.jpg
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At first glance things look practically identical. The only thing I haven't figured yet in Logic is how to get the same zoom ratio to make it easier to visually compare 2 windows.


This is a zoom on that very first PGC signal from the red box:

Name:  U2 pgm 16F877 Easy Quiz - Pgm start A.jpg
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The PGC signals are somewhat delayed relative to PGD.


And this is the second PGC signal:

Name:  U2 pgm 16F877 Easy Quiz - Pgm start B.jpg
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An even bigger difference in signals.


I guess I'm stuck to using the old Pentium 4 until I figure this out.

(I have to say I love my Saleae logic probe)