HC11 & Edelbrock ProFlow

[Orin Eman]

> Tom Sharpe <twsharpe at mtco.com> wrote:
> > I forgot where I got them....  from a list of op codes somewhere.
> >
> > 7B (D) 6B (X) 186B (Y) = TIM (Test immediate to memory????)
> > 75 (D) 65 (X) 1865 (Y) = EIM (same as EORA except to memory)
> > 72 (D) 62(X) 1862 (Y) = OIM (same as ORAA except to memory)

> Those aren't standard 68HC11 instructions.  Are you sure they are in
> code?  Could it be that you disassembled a data area as if it were code?

> If they are actually used as real opcodes, then Motorola is being
> sneaky.  The 'HC11 is supposed to trap all illegal opcodes - thus
> preventing programmers from using the interesting results of undefined
> opcodes.  Moto could have added these opcodes (under the table) at some
> point.  This isn't unheard of - some Intel 8085's contain some very
> useful extra opcodes.

The direct and X register versions above match the Hitachi HD6303.
Perhaps it's a Hitachi variant, or Motorola merged Hitachi changes
back into their CPUs.

Orin.