PC's and EFI

[Joe Boucher]

To be perfectly honest to both you and Jim the LandShark, I'm not at the point to actually start
doing this, but I'm building my knowledge base so I can.  Yes, I would appreciate you looking up
the info as long as it's not too much trouble.

I keep switching between a MAF and a MAP system, but will probably use a GM ecm older than 1990
to hold down the amount of software I may have to digest.  The only prom data that has been
decoded I can find on the net is for the turbo charged V-6's.

So, after the code is disassembled, it would be nice to use some contraption to work with the
maps on the fly, so to speak.

Thanks,

Joe Boucher
'70 RS/SS Camaro  '81 TBI Suburban

John Morris wrote:

> I've seen the plans for a card which goes into a PC.  It has some
> static RAM on it, and an interface cable which can plug directly into
> a ROM socket.  You just download your program into the static RAM, and
> the board pretends like it's a ROM to the microcontroller board.
> There may also have been a similar circuit that interfaces to a
> parallel port, too; I think that's probably exactly what you want?  If
> you're interested, I could dig it up and tell you more.
>         JMan
>
> >X-Authentication-Warning: esl.eng.ohio-state.edu: mail set sender to owner-diy_efi using -f
> >Date: Tue, 17 Mar 1998 12:11:35 -0600
> >From: Joe Boucher <BoucherJC at lmtas.lmco.com>
> >Organization: Lockheed Martin
> >
> >You guys and your software jokes!  You crack me up!  (Did any other mechanical
> >types understand it?  Uh, huh.  Me neither.)
> >
> >Before you two get into a pissing contest to see who can piss higher up the PC
> >tree, let me try to deflect the conversation a little.  How hard would it be to
> >hook a laptop to a GM ecm directly to the eprom to develop the various maps and
> >flags for tuning a custom engine setup?  The idea is to avoid having to pull and
> >replace the prom chip for every small change.  The idea would be to feed the ecm
> >with data out of the laptop until the prom maps are nailed down, then burn the
> >prom from the file in the laptop.
> >
> >The configuration of the prom chips I have seen are 24 and 28 pins.  The parallel
> >port has 25 pins or so (25, 26, whatever it takes). I'm guessing this might
> >reguire a separate board if a lead for each pin of the prom is required.
> >
> >And I'm sure some software is required.
> >
> >Whatyathink?  This inquiring mechanical mind wants to know.
> >
> >Joe Boucher
> >'70 RS/SS Camaro  '81 TBI Suburban
> >
> >