1228331 ECU Processor (P4 processor info)

[Peter Gargano]

According to the disassembly of BUA, here are some other locations
that Steve has not mentioned at:

  http://www.diy-efi.org/gmecm/ecm_info/p4_registers.html

$04xx        Heads up display (HUD) RAM variables (if present)
$3fC0-$3fff  Other hardware registers controlling peripheral devices
$58xx        HUD code (if present)

steve ravet wrote:
> 
> I made a very rudimentary P4 memory map based on some information from
> Ludis and a couple others in the archives.  You can find it on the gmecm
> WWW page, under ECM info, then P4 memory map.  Is that ECM a P4?  If so
> it is a "GM special" processor, with a different memory map, and at
> least a couple instructions left out.
> 
> --steve
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