PROM Size on a 165
Gabe
gellett at earthlink.net
Fri Nov 17 17:12:20 GMT 2000
Hmmm,
I've been programming only the 1'st portion of 256's and 512's for quite some
time now with no problems on my 165....
Now you guys have gone and done it.... As long as I didn't know better I was
fine, now I'll start having trouble...
Gabe
"Romans, Mark" wrote:
> When I have programmed 256's for 128 app, I had to either program the 2nd
> half or double load it for the chip to work. Loading the first half never
> worked for me.
> Mark
> ----- Original Message -----
> From: "Craig Marcho" <marcho at flash.net>
> To: <gmecm at diy-efi.org>
> Sent: Friday, November 17, 2000 6:21 AM
> Subject: Re: PROM Size on a 165
>
> > well, I know I had a '165 chip for an '87 vette that was supposed to be
> 128,
> > and had a 256 chip on it. Funny thing was, the low side of the chip was
> > blank, and the high side was programmed. This was a Delco original chip,
> > too.... so I think to be safe, program both sides.
> >
> > Craig M.
> >
> >
> > ----- Original Message -----
> > From: <ae2598 at wayne.edu>
> > To: <gmecm at diy-efi.org>
> > Sent: Friday, November 17, 2000 7:42 AM
> > Subject: Re: PROM Size on a 165
> >
> >
> > > Is double-loading the thing to do, instead of just blanking out the
> second
> > > half? I ran into the same situation at work, I took an image off a 128
> to
> > > replicate, but only had 256's to use for the copies. Nobody around here
> > > had 'em in stock, either.. 128 must've been an unpopular size? Anyway I
> > > took the 128 image, only write the first 1/2 of the chip, leaving the
> high
> > > side blank, and it seemed to work. I guess the success of this would
> > > depend on what the 128 circuit does with the pin that is used as the
> > > high-order address line on the 256, I can't remember if it was NC or if
> it
> > > had some other use on the 128.
> > >
> > > On Thu, 16 Nov 2000, Bruce Plecan wrote:
> > >
> > > >
> > > > Double load the 128 image in the 256 and be done with it (er go for
> it)
> > > > Bruce
> > > >
> > > >
> > > >
> > > > > Newbie working on a 165 ECM. I have many 256 PROM's but no 128's.
> > I'd
> > > > like
> > > > > to put the 256's to work. The schematic's I have seen on ECMGUY's
> > site,
> > > > > show what looks like PROM pin 27 wired to A14 of the ECM bus. (CS
> and
> > OE
> > > > > are also reversed) This does not make sense. Pin 27 of the
> original
> > 128
> > > > > PROM is /pgm pin, which should be tied high in the ECM.
> > > > >
> > > > > I'm guessing the schematic was made from a later version ECM that
> > takes
> > > > 256
> > > > > PROM's. (Hense the A14 connection.)
> > > > >
> > > > > Does the MEMCAL not interface w/ A14 on the ECM board? i.e. Does
> the
> > > > MEMCAL
> > > > > tie PROM pin 27 high? Can someone confirm that PROM pin 27 on a 165
> > ECM
> > > > is
> > > > > held high all the time? Will using a 256 part for a 128 ECM cause
> > error
> > > > > conditions for certain BIN editors? i.e. Do the editors check this?
> > > > >
> > > > > I apologies if this has been discussed before, I have not yet found
> > the
> > > > > archive seach.
> > > > >
> > > > > ML
> > > > >
> > > > >
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ole" <brief456 at hotmail.com>
To: gmecm at diy-efi.org
Subject: Re: PROM Size on a 165
Date: Fri, 17 Nov 2000 12:51:26 EST
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Sorry, that wasn't ECMGUY's schematic, was another:
http://www.cruzers.com/~ludis/1227165schematic.html
The other commets all make sense. Pin 27 needs to be pulled high for the
128 to work. (pin 27: 128: /PGM 256: A14) i.e. A single load must be
loaded high on the 256.
>From your comments I will assume that A14 is either not connected to the
MEMCAL, or it is tied high, or this memory space is unused by the micro.
All of which solve this small problem.
Thanks for the input.
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