Re: Debugger board for P4 ECMs

["Swayze" <kswayze@bellsouth.net>]

would it be possible to use this as an 'emulator' to setup and 'tune' the
.bin  on the fly? If so I'm in.

........
> I can dump and alter memory, I/O, and registers including the PC.  I can
> also run simple programs written in an interpreted language.  There's
> currently no disassembler because all code in the ECM is part of the
> debugger.  It's easy enough to work from a listing instead.  Plus, a
> desktop system could do a much better job of disassembling.  There's
> also no single step because the P4/HC11 doesn't support that in
> hardware.  There are tricks to single stepping on such systems.  I now
> know enough about the P4 hardware to try one.
>
> The timer chip on the board is useful for simulating EST, MAF, VSS, and
> VATS signals.  Because it uses the same clock as everything in the ECM,
> any ECM timer values will be rock solid steady.
>
> This board could be used on an ECM running an engine.  You'd get a
> serial interface to a laptop separate from the ALDL interface.  This
> would require grafting debugger software onto GM's software.
>
>