What were they thinking?

[Dan Plaskett]

Carl,

The sticker on the e-prom is BUA 1728.  The numbers printed on the eprom are
014P 5DBB, 69300, and AC8647B.  For your reference this chip was originally
from a 1986 Corvette with iron heads, automatic transmission and a 3.07 rear
end.  Interestingly my original 1986 chip verifies out as a 27C128.  The
numbers on it are AANM 2770 on the sticker.  On the e-prom it has 16040581,
796    K, 5029 8604.  It is from an 86 Corvette convertible with aluminum
heads, automatic transmission and a 2.73 rear end.  I have another 86
Corvette chip that again has BUA 1728 on the sticker and this eprom is
identified as a 27C256 chip on the chip.  Other numbers on that
chip16069300, 27C256/5DBB, D 5012AP,U72541MSX.  Can't tell you what the
numbers mean except for the obvious.  Hope this helps somebody sometime.

Dan

----- Original Message -----
From: "Carl Summers" <InTech at writeme.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, April 21, 2000 3:38 PM
Subject: RE: What were they thinking?


> Hi Dan,
>      Could you get me the numbers printed on the eprom???? I'd like to
write
> them down for future reference. Thanks
> -Carl Summers
>
>
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Dan Plaskett
> Sent: Friday, April 21, 2000 12:59 PM
> To: diy_efi at diy-efi.org
> Subject: What were they thinking?
>
>
> Lightbulbs have started going off lately.  Perhaps I'm just stupid, but
did
> anyone else know that GM was using 27C256 chips in the 86-89 TPIs.
> Everything I had read said that they were supposed to be 27C128s.  I set
my
> eprom programmer to read 27C128s, made sure the checksums were the same
all
> the way through, documented each step as I'm going along, then bam I hit a
> brick wall when trying to program the chip after erasing it.  Error,
error,
> error.  No identification on the chip of course.  By some stroke of luck
> however one of the chips did respond when asked for self-identification.
> Guess what, it's a 27C256.  Reset the configuration to burn that chip, no
> more problem.  Since the bin files I created were all 16K I am assuming
that
> the back half of the chip was blank.  I did get a different sumcheck on
one
> of them using the configuration for 27C256.  But the bin file that I
created
> and the readouts from TunerCat were identical, so I am assuming that it's
> OK.  There I go assuming again.  Just thought I'd pass that along for any
> novices like me out there.
>
> Dan Plaskett
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

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