Dumping ROM combo chips

[Don.F.Broadus at ucm.com]

Thanks ,you must get tired of telling us about the air temp sensor, now I
remember the post you had made before
About the air temp sensor . You DA Man  Thanks for the info.
 
Don


	-----Original Message-----
	From:	Bruce Plecan [SMTP:nacelp at bright.net]
	Sent:	Monday, November 30, 1998 12:52 PM
	To:	diy_efi at efi332.eng.ohio-state.edu
	Subject:	Re: Dumping ROM combo chips


	-----Original Message-----
	From: Don.F.Broadus at ucm.com <Don.F.Broadus at ucm.com>
	To: diy_efi at efi332.eng.ohio-state.edu
<diy_efi at efi332.eng.ohio-state.edu>
	Date: Monday, November 30, 1998 1:21 PM
	Subject: RE: Dumping ROM combo chips


	>Thanks guys for looking it up. The ECM was out of a full sized
Chevy taxi.
	>U-Pull-it had marked 90  5.7 TBI on the outside
	>Of the car but I wasn't sure if it was since the body style looked
older
	and
	>the tail lights were guide 1987, I couldn't find the vin number any
where.
	>Is this ECM 747 compatible ?

	Does it plug in?, yes, will it work, correctly?, Only if you add an
air
	intake temp sensor (I think all the car TBI's used air temp).
Different
	table locations, I venture to say.

	Bruce
	>
	>Thanks for putting up with all of my questions
	>
	>Don
	>
	> -----Original Message-----
	> From: Bruce Plecan [SMTP:nacelp at bright.net]
	> Sent: Monday, November 30, 1998 9:08 AM
	> To: diy_efi at efi332.eng.ohio-state.edu
	> Subject: Re: Dumping ROM combo chips
	>
	>
	> -----Original Message-----
	> From: Don.F.Broadus at ucm.com <Don.F.Broadus at ucm.com>
	> To: diy_efi at efi332.eng.ohio-state.edu
	><diy_efi at efi332.eng.ohio-state.edu>
	> Date: Monday, November 30, 1998 9:44 AM
	> Subject: RE: Dumping ROM combo chips
	>
	> 1990 5.7L eng code 7,   helps to have a rough year of application
if
	> possible.
	> Bruce
	>
	>
	> >Thanks very much for the info ! I have found another ECM this
week,
	>could
	> >you please identify this one also
	> >1228746 AUML 1209  the engine was out of the car so I don't know
	>the
	> >application.
	> >
	> >Thanks Don
	> >
	> > -----Original Message-----
	> > From: Bruce Plecan [SMTP:nacelp at bright.net]
	> > Sent: Wednesday, November 25, 1998 6:21 PM
	> > To: diy_efi at efi332.eng.ohio-state.edu
	> > Subject: Re: Dumping ROM combo chips
	> >
	> >
	> > -----Original Message-----
	> > From: Don.F.Broadus at ucm.com <Don.F.Broadus at ucm.com>
	> > To: diy_efi at efi332.eng.ohio-state.edu
	> ><diy_efi at efi332.eng.ohio-state.edu>
	> > Date: Wednesday, November 25, 1998 10:00 AM
	> > Subject: RE: Dumping ROM combo chips
	> >
	> >
	> > >Could I bother you for info on  Prom ABHC 7377 out of a 1227747
	>ECM
	> >from a
	> > >1987
	> > >Full sized GMC Van.  Would this PROM work on a  stock 5.7L
	>engine
	> >
	> > Yes, it's out of a G Van.  If the 5.7 is in something much
	>lighter,
	> > different then the match will be less than perfect drivibility
	>wise.
	> > GM looks at lots of things when they do a calibration, the finer
	> > it is tuned the less transferable it is.
	> > Bruce
	> > >
	> > >Thanks Don
	> > >
	> > > -----Original Message-----
	> > > From: Ludis Langens [SMTP:ludis at cruzers.com]
	> > > Sent: Wednesday, November 18, 1998 2:55 PM
	> > > To: Diy_efi
	> > > Subject: Dumping ROM combo chips
	> > >
	> > > Many of the older GM ECMs use a 40 pin DIP combination
	>ROM/RAM/IO
	> > >chip.
	> > > (The pinout is on my web site.)  This chip has 4K bytes of
ROM,
	> >128
	> > > bytes of RAM, and 8 digital I/O lines.  The chip receives all
16
	> > > processor address lines and does it's own address decoding.
	> > >
	> > > If you wish to read out the ROM from one of these out of
	>circuit,
	> > >you'll
	> > > need to provide an E clock signal.  I wired up an adapter to
	>read
	> > >these
	> > > chips in a PROM reader as a 27512.  The RAM and I/O appear to
	>read
	> > >OK
	> > > with E tied high.  The ROM however doesn't.  The PROM ~OE
signal
	> > >needed
	> > > to be inverted and applied to the combo chip's E input.
	> > >
	> > > --
	> > > Ludis Langens                               ludis (at) cruzers
	> >(dot)
	> > >com
	> > > Mac, Fiero, & engine controller goodies:
	> > >http://www.cruzers.com/~ludis/
	> > >
	> >
	>