P4 GM ECM using 68HC11

[BigBrother at mail.utexas.edu]

What cars was the P4 used in?  Is it in all the TPI camaros/firebirds?
Thats the only GM ECM I've seen using a 27256.  It would be great to
tear one of those down and figure it out.

Is the OEM code on ROM on the chip?  I know you can get 68hc11 mask
programmed at motorolla, but considering there is an external 32k
EPROM maybee they don't use that.

Either way, I'm definately headed to the junkyard this weekend to
get one.

Thanks,
Jeff