Other Schematics Wanted

[Andrei Chichak]

A while back I was on the DIY workstation list and the whole thing
degenerated into a processor war with some wanting the group to use an
R4000 others wanting to use Sparcs and one guy with a 68020 schematic in
his hand.   No consensus was ever achieved and the whole thing died.

This group could go the same way once the HC11 gang get into the act or the
PPC403 gets released (I sure hope not though).   There are a bunch of
things that all of these processors have in common that we should be
talking about rather than starting processor wars.   The interface hardware
should be very similar and algorithms are not processor specific.

Given that we are going to need to take timing information off of the crank
and cam, probably with Hall effect sensors, and are eventually going to
need to drive ignition coil packs and injectors:

What driver circuitry is required to take a TTL load from a parallel port
and drive an ignition coil pack or injector?

What signal conditioning circuitry is required to take a Hall effect sensor
and apply it to an interrupt line?

What signal conditioning circuitry is required to take a Knock sensor and
apply it to an interrupt line, and should you mask this interrupt during
ignition?

I would like to throw together a bit of a breadboard to try this stuff out
before I use it to blow $300 worth of wirewrap to bits.

I suspect that schematics for these circuits are available in some long
lost periodical but searching through my stacks came up with nada.  The
computer geek magazines like to debate processors and generate faster
fractals and the auto mags won't talk about electronic circuits unless you
can pick them up as a black box.


Thanks in advance,
Andrei

'62 Morris Traveller w/ 1350CC Cooper 'S engine
'83 VW GTI 230,000 Km. and it keeps on going...

--
Andrei Chichak                   | Information Systems
agc at mercury.uah.ualberta.ca      | University of Alberta Hospitals
(403) 492 - 4431 (work)          | 8440 112 Street  Edmonton, Alberta
(403) 492 - 3090 (fax)           | CANADA  T6G 2B7