Problem erasing & re-using GM Proms

[Programmer]

Mike,
After erasing, try reading and checking that all the bytes have flipped
to "FF". Then up the programming voltage if it keeps giving you error
programming messages. I never solder anything--haven't had to yet.

Lyndon.
----- Original Message -----
From: <ECMnut at aol.com>
To: <diy_efi at diy-efi.org>; <gmecm at diy-efi.org>
Sent: Thursday, January 04, 2001 6:49 PM
Subject: Problem erasing & re-using GM Proms


> Have anyone been able to erase a GM prom & reprogram it?
> I always have to solder a regular 27xxxx eprom on before I can
> re-program..  I can never seem to re-burn the factory original
> prom, which doesn't seem to have meaningful identifiers on it.
> My latest is a 27256 like thing from a '93 L35 4.3 engine.
> Could I be using the wrong programming voltage?
> Thanks,
> Mike V
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