Hello MadDog,
A while ago, I asked on Chipdir-L -
PMU (68HC05) in an Apple PowerBook - possible to
reflash?
Here follows the only reply that I saved from a very
long thread:
“As a shot in the dark cover the 6805 with black
electrical tape and try that. They where very light
sensitive. Mostly an issue when programming the EPROM
based parts.
Remember that eletrical tape is transparent to UV,
making it virtually unusable. Use aluminium paper or
something OPAQUE to UV...
black electric tape is not transparent to UV! Neither
is regular glass! UV light is actually absorbed much
easier than visual light (just think of sun-blockers
and UV safe sun glasses) or IR. Black electric tape
_is_ almost transparent to IR radiation.
Aluminum tape or aluminum laminated paper is generally
used to cover EPROMs because of its long-term
stability against light (bleaching) and
oxidation/corrosion.“
Best
George
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