Programming chip

[Shannen Durphey]

Hi, Dan.  
Hex workshop demos are available all over the place.  Here's one
place...
http://www.bpsoft.com/

I don't know of a disadvantage to using the larger chips, but I'm
really no expert.  There are ways to use larger chips to store more
than one calibration, then switch between the two.  This is in the
archives.
The advantage for me was that I could raid the bios out of a junk 386
motherboard and use the eprom for my 749 testing.  I've also walked
through the used pc stores sucking up used and junk cards and stealing
eproms out of them.  Most I pay is $1/card, usually less.  
Shannen

Dan Plaskett wrote:
> 
> Shannen
> 
> Got your and Bruce's messages about double entering the bin after I stuck
> the new chip in.  I think it must have gone into limp home mode.  As soon as
> I put a load on the engine, it died.  Can you elaborate on this Hex Workshop
> program?  Where could I get it?  Also is there any advantage to using the
> larger chips?  Any disadvantage, other than the need to copy and paste the
> bin file multiple times?
> Dan
> 
> "Shannen Durphey" <shannen at grolen.com> wrote:
> 
> > I've tried it.  I am using 27c256 chips now for the 165 ecm's, and for
> > the 16k syty calibration, with no trouble so far.  I was using a
> > 27c512 for a short time, until it met an untimely demise.
> >
> > But don't forget that you need to load the file into the top of the
> > chip.  The easiest way that I've found is to use Hex Workshop to load
> > the original file, copy all the data, and paste it at the end as many
> > times as needed to fill the chip.  The trick with this is that your
> > editor will want to edit the lower set of values, while the ecm will
> > run on the upper set.
> > Shannen
> >
> > Dan Plaskett wrote:
> > >
> > > Anyone ever tried using a 27C512 chip in place of a 27C256?  I just read
> one
> > > of my 91 vette chips, created a bin file, programmed it into the 27C512
> > > chip, read it back and created a bin file, then opened it using the
> TunerCat
> > > software with the $8D calibration file with no problem.  So my question
> is,
> > > as long as I have a chip that is at least as large as necessary to hold
> the
> > > information does it matter what I use?
> > >
> > > Dan
> > >
> >
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