Memcals & Netres

[Malcolm Robb, LC 0112G]

This development MEMCAL's netres is discrete resistors only.  The production
MEMCAL as fitted to my car has these resistors integrated into 2 'chips',
which I understand is normal. Whilst I don't doubt that this combination of
resistors is unique to my type of car (a 1990 Vauxhall/Opel Lotus Carlton),
it should give anyone trying to decypher their own netres's resistor values
an idea of the connectivity. You'll need to be good friends with Mr Ohm and
Mr Thevenin though !

I have compared the EPROM code in the development MEMCAL with my car's
production one, and everything is the same except for 2 values in one of the
Spark Advance tables. I also know that the development MEMCAL works in my
car. Therefore <flame suit on> I'm assuming that both the ESC and NETRES are
discrete component implementations of the production version.

If anyone wants to redraw the circuits in a more user friendly way, I have
no objections. Use the circuits, photos and info as you want, at your own
discression & risk. It would be nice to produce a 'TurboP4.pdf" style
document covering the Memcal & Netres.
<flame suit off>

Cheers,
Malcolm Robb

----- Original Message -----
From: steve ravet <sravet at arm.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, May 08, 2001 6:22 PM
Subject: Re: Memcals & Netres


> Is this netres a chip, or is it actually discrete components?
>
> --steve
>
> "Malcolm Robb, LC 0112G" wrote:
> >
> > Hi,
> > A few months ago I came across a development MEMCAL for the 01228331 ECU
> > used in my Lotus. I've discussed it off list with a few people, but I
don't
> > think the information has got public here yet. Anyway, I've traced out
the
> > circuit diagram, and made a pdf file from it together with some photo's.
> > I've put it on incoming as ftp://ftp.diy-efi.org/incoming/memcal.pdf
> >
> > I haven't bothered with the EPROM part of the MEMCAL, coz we all know
how
> > that's wired in, don't we ! But I have worked out the NETRES and ESC
filter
> > components. If you have any questions, or want me to measure anything
else,
> > please be quick because the MEMCAL's owner has asked for it back !
> >
> > Cheers,
> > Malcolm Robb
> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com


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