need help Programming '165 Memcal

[Craig Marcho]

Well,

I tried to program a chip for an '86 Corvette, and it didn't work. Maybe
somebody can tell me what I've done wrong and steer me in the right
direction.

I've got three memcals for this application, one fairly old and original,
and two new ones from GM that I got a couple weeks ago. I read them all fine
as 27C128A. Then I erased them, (the new ones seemed to take a long time to
erase...). I changed what I needed to in the code, and then went to program.
I programmed one of the new ones first, as 27C128A. Put it in the car, and
it didn't work. The car ran, but the check engine light flashed a bunch and
the idle was very erratic. So I pulled the chip, and erased it. I had
another new GM chip so on a hunch I read it as a 256 and it had the code in
there twice, so I'm guessing that the new chips were 256k eproms. I erase
the one I programmed and tried to program it as 27C256A. The Needham's EMP
software spit back at me as soon as I started programming. It didn't program
correctly and quit. I had to erase it again. I then tried as a 27C256 and
same thing, complained right away and didn't program. I programmed the older
chip as a 27C128A and it programmed nicely, but with the same results on the
car... check engine light and erratic idle. I have no clue what these chips
are, or what voltage they should be programmed. If I tried to program a
27C256A chip at 27C256 voltage did I fry it? Should I just remove the delco
eprom and buy some eproms that I can program and stick them on the memcal?
I've done hundreds of 2732 chips with no problems at all, but haven't had
any experience with these chips in the memcals and am not having much
success. Please help me out here, let me know what I should try....

Thanks for any help!

Craig M.

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