need help Programming '165 Memcal

[Craig Marcho]

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.
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org


----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org