Grand Prix Turbo wiring diagrams/opcodes

[Peter Gargano]

Dave, and other GM hackers,

Donald Whisnart's M6911DIS disassembler is "intelligent". So it will
"seek" code, and by default it gives DEFBs for code paths it doesn't find.
OTOH, I'll look in the archives and see what Ludis said about invalid
opcodes (but he says the P4's CPU uses basically the 6801 instruction set,
but includes a lot of the HC11 internal peripheral hardware, but ECMguy's
Hac shows that the P4's peripheral control registers are *NOT* as Motorola
finally defined for the commercial HC11 - they are obviously an early
prototype).

Dave Zug wrote:

> The other post about invalid opcodes: I dont know how common it is but in my
> DIS of the 7727 turbo GP-89 there is at least one DATA table placed in with
> the code section - and a disassembler will not pick this up right unless its
> pretty smart.  Mine yes gave "illegil opcode" when it stumbled onto that
> section.
>
-- 
Peter Gargano