I am trying to program a chip, using a Tait style programmer. I have
recently switched to a 18v/800mA wallwart (measures 24v on the DVM)
instead of 2 9v batteries. I think this is enough power, I am seeing
4.5v on Vdd and 13.2v on Vpp. The problem is the only PIC I have is one
I possibly cooked some time ago. The programming is _very_ erratic,
predominantly failing with reading 0x3FFF for the device ID. Am I
correct in assuming the PIC _is_ dead and the programmer is working? I
don't want to risk cooking off another PIC (even a sample) and
making/buying another programmer is prohibitive for my (very) meager
project budget.

Also the only thing I have found different between the 16f627 (original
chip) and the 16f627a (sample) is the programming algorithm, my
understanding of the datasheet suggests that otherwise they are
identical and meant as drop in replacements. Is this correct?



--
Anthony Toft <toftat@cowshed.8m.com>

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