RE: ur-Q Mac02 ECU Schematic: New Availabilty

["Buchholz, Steven" <Steven.Buchholz@kla-tencor.com>]

While I definitely and wholeheartedly appreciate the efforts of the folks
who produced and distributed the MAC-02 schematic, I wanted to make sure
everybody knows that they were an attempt at reverse engineering, and by no
means are they guaranteed to be accurate.  I know that when I looked into
them a couple years back I was able to identify some minor errors fairly
quickly.  

That said, the schematics are an excellent reference, and to someone who
understands electronic circuitry they do help provide insight into how the
system works the way it does.  One thing that jumped out at me was a full
understanding why the system doesn't work when the distributor window is
misadjusted ...

I have actually managed to collect data sheets for some of the more obscure
components on the board ... most notably the micrprocessor.  Unfortunately
the spec for the other LSI chip eludes me, but if anyone wants to have a
copy of what I have, please feel free to contact me.  

Steve Buchholz
San Jose, CA (USA)

> ----------
> From: 	Douglas H. Quebbeman[SMTP:dougq@iglou.com]
> Sent: 	Thursday, May 06, 1999 5:29 AM
> To: 	Joseph Rae
> Cc: 	quattro@audifans.com
> Subject: 	Re: ur-Q Mac02 ECU Schematic: New Availabilty
> 
> On Wed, 5 May 1999, Joseph Rae wrote:
> 
> > well I do own an Urq I just don't have it yet, it is on a truck in San
> > Fan.... it is an 82 sold as an 83 what does it have?
> 
> Yeah, mine was built in March 82, sold as an 83... yes, it has
> the MAC02 ECU. The next requirement for this schematic to be of
> any use to you is that you have	*some* kind of background in
> electronics (hobbyist or professional). Lacking that background,
> you'll be better off leaving the engine management customization
> to a commercial firm like Ned Ritchie's Intended Acceleration
> (no affiliation, etc).
> 
> Finally, if you have the electronics background but never got
> involved with software, then you still might have little use
> for the schematic. It might, however, be of some use if your
> ECU ever develops a problem. I had to repair one of my MAC11b
> ECUs last year, and didn't have a schematic, which would have
> helped. Thanks to Orin Eman and other qlisters, I got that
> ECU fixed without benefit of the schematic.
> 
> hth explain the wheretofores... -doug q
> 
> --
> -Douglas Hurst Quebbeman (dougq@iglou.com)            [Call me "Doug"]
> 74 100LS Auto, 77 100LS Auto, 84 Coupe GT, 86 5Kcstq
> "The large print giveth, and the small print taketh away."  -Tom Waits
> 
>