need help Programming '165 Memcal

[Richard Wakeling]

Hi Craig,
    What markings (numbers/letters) are on your eproms? I will try and Identify
whether they are 128 or 256 types. If they are 256 types and you want to prog a
128k bin it must be put in the lower half if viewing with a hex editor. To do
this load the 128k bin at 4000 and the end will fall automatically at 7FFF

Cheers Richard.

Craig Marcho wrote:

> 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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