>
> alan smith wrote:
>> Tim,
>>
>>   From my experiance, you need to do at least ONE bulk erase with 5V,
>> and then forever more, it will work fine with 3.3V.  Its hit and miss
>> if you don't do the one time bulk erase, but
>>   try that and see if it works for you.
>
> I can confirm the same bizarre requirement. 16F876As. Would not verify
> using ICSP @ 3.3V.
> After one bulk erase at 5V (all parts were tolerant of 5V) loaded fine,
> and bootloader
> then worked correctly. Weird, but now I just put in the bootloader
> (ROMZap) @ 5V
> and then all is well.
>
> Robert


Is there a chance the chips were code protected? It seems the only way to
get rid of that is a bulk erase, which, of course, requires 5V. You can,
however bootload at 3.3V with code protect enabled.

Harold

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