8748 add'l injector controller design

[Charles]

    I have completed the breadboard of my 8748 controller which drives 
two 60 lb/hr injectors (using MC3484 peak/hold drivers). It works great 
in my BMW 745i (factory intercooled turbo, 7-8 psi). I am now running 
16-17 psi boost with no detonation - in fact, I think my fuel map is a 
little too rich! (no oxygen sensor).
     I have laid out the artwork for a two-sided PC board using Eagle 
2.6, but have not had it fabricated yet (the first two boards are the 
expensive ones - about $250-300 ;) It's not a very flexible design (map 
is stored in EPROM), but it _is_ simple, with a low component count, 
and the software is only about 100 bytes long (plus the 256 byte map). 
The only expensive item (other than the PC board ;) is the 0-30 psig 
pressure sensor with 0.5-4.5 volt output - cost me $43 from OMEGA.
    Anyway, if anyone's interested I can post a ZIP file with the 
schematic and the artwork (printable on a HP laser printer). It's only 
about 60Kb compressed. Usual disclaimers about blowing up CPU's 
and engines at your own risk, etc.
    Next revision is to add a multiplexer to the A/D input (from the 
pressure sensor) so that an oxygen sensor may be used for closed-loop 
control.
-Charles