need help Programming '165 Memcal

[Richard Wakeling]

Hi Craig,
    The memcal on the right looks to me to be 128 type. I am not so sure about
the one on the left. It is definitely a newer type as it uses the blue chips.
You mentioned that you were able to read the chips before erasing them so this
tells me that your orientation and wiring is correct. With your programmer can
you compare the newly burnt chip with the bin file you have loaded?

Cheers Richard.

Craig Marcho wrote:

> Here's a picture of two of them... the newer memcal is on the left...
>
> http://home.flash.net/~marcho/twochips.jpg
>
> yeah, when I attempted to program them as 256, I just put the bin in there
> twice so that it started at 0000 and then repeated at 4000.
>
> Craig M.
>
> -----Original Message-----
> From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
> Of Richard Wakeling
> Sent: Sunday, December 10, 2000 11:33 PM
> To: gmecm at diy-efi.org
> Subject: Re: need help Programming '165 Memcal
>
> 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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