What were they thinking?

[nacelp]

> 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.

Yes.  Like everything else around here, nothing is written in stone.  GM
does what gm does, same engine, same ecm, different code, why?, I dunno.
Nothing stupid about that.  Just after a while ya jus kinda always look to
see if the read is right or strange.   Usually the reader will read either,
and it will just look strange.
  Also, seen em use just the upper, or lower 1/2 when doing that
Grumpy

> 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
>
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