FC 45

[Ludis Langens]

"David A. Cooley" wrote:
> 
> That's GM's designation for the processor in the ECM.
> C3 is the older units, P4 and P6 are the newer CPU's.  P4 and P6 are based
> on the 68HC11F1 and the C3 was based on the 6809.

C3 is _not_ based on the 6809.  It is instead related to the 6801.

(The 6809 is to the 6800/6801/68HC11 as the 8088 is to the
8080/8085/Z80.  Sort of.  Kind of.)

Also, the P4 is not based on the 68HC11F1.  I'd be inclined to say the
'HC11 family is based on (or inspired by) the P4.  Two reasons:  The P4
is missing a few 'HC11 opcodes.  The P4 seems to be NMOS.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/