68HC11 Disassembler and AC Delco ECMs

[Donald Whisnant]

I've noticed the recent postings by several people looking
for a 68HC11 disassembler.  Several months ago I mentioned
the 68HC11 disassembler I wrote.  It is a code seeking
disassembler that actively separates code from data (you
just give it a starting address, like reset vectors, etc).

It is directly compatible with the asXXXX assemblers writen
by Alan Baldwin (I think that is his name) at Kent State
University in Ohio  .... i.e. output disassembly when
re-assembled by the as6811 assembler will match the original
binary without modification...

I would be willing to share it with the list... In hopes that
some of you can help with my ECM project.  I am working on
reverse engineering the AC Delco ECM that came with my '94
4.3L V6 CMFI engine (eprom E6 code -- that came out of a
'94 AstroVan) ...  I've got all of the code actually
disassembled, but now I'm working on figuring out what ports
are what and what tables are what --- especially things like
the speed limiters (for starters) ...  Any information that
you have that would help would be greatly appreciated ....
I've recently put the engine in my '85 Grand Prix and will
eventually replace it with my own DIY computer -- but first
I want to look at and evaluate GM's algorithms (since they
spent so much time and money developing and perfecting them)...

If you would like a copy of the assembler, email me and I'll
email you a copy of it -- tell me what encoding you want
for the email (i.e. uuencode, mime, binhex, etc)...

Donald Whisnant
dewhisna at ix.netcom.com