Re: QLCC urq questions

[Robert Houk - WorkGroup Server Firmware <Robert.Houk@East.Sun.COM>]

   A few days ago I downloaded Robert Houk's annotating dissasembler and
   microcontroller code for the MAC-02 (nice piece of work, btw, to RDH
   and everyone who contributed).  I do have a few questions that I
   think you guys can answer more quickly than it would take me to figure
   it all out (a.k.a. laziness).

   Which Motorola microcontroller is used in the MAC-02?  I have a technical
   data book on a variant of the 68HC11, which seems to be mostly (if not
   completely) compatible with the urq code.  I have encountered a few
   discrepancies between the code and my databook, however, that I want
   to clear up.

It's a 6802 (an Hitachi equivilent). The HC11 is kind of a big brother
(newer generation) 8-bit CPU; the family resemblance however is pretty
complete.

   Secondly, Robert's annotations list one 8-bit bidirectional data
   port, but nothing else.  How does the MAC-02 read the engine
   speed, boost/vacuum pressure, intake manifold temp, etc.?  Is it
   using other ports that I haven't yet stumbled on?

It's all done through that one magic chip that no one has been able
to get any documentation for. Hitachi is less than forthcoming with
information about it, other that it's obsolete and they show no
"replacement" part number, and would I please go away and quit bothering
them.

Once I got the primary data tables mapped and identified, I lost my
urge to decode and understand the raw machine code . . .

					-RDH