What were they thinking?

[Shannen Durphey]

Not all are 256's, not all are 128's.  I have a couple of confirmed
27128's which came from a 165 Vette.
Shannen

Dan Plaskett wrote:
> 
> 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
> 
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