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Re: 1228331 ECU Processor (P4 processor info)
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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