> >>It seems to me that the one thing that changed was "reloading the
library
> >>on the Dataman S4"
>=20
> It's starting to look like that is where the problem lies, I just dont
know
> what to do about it. I have reloaded the 'Library' a couple of times
since,
> and while it reloads with no problem and shows all the different chip
types
> in it's memory etc  ...  still no go.

You are selecting the correct manufacturer from the menu for each chip?
Even for nominally the same EEPROM different manufacturers do have
subtly different programming algorithms and voltages.

But that doesn't explain why the chips apparently program and verify.=20

I would be tempted to load the master chip, read a few locations writing
down the contents. Now turn off the programmer, power back on and read a
failing chip. Do the memory locations read the same?


--=20
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--=20
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