Information Request: unidentified HP 9825T instructions

[Tony Duell]

On Wed, Feb 15, 2017 at 1:57 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
>     > From: Tony Duell
>
>     > Having other hardware decode instructions that appear as NOPs to the
>     > main processor is not uncommon in HP machines.
>
> Ah, so you actually had some prior knowledge that helped in working out that
> puzzle, that that's what's happening here! :-)

Nothing that isn't now available to anyone, like 'my' schematics of
the 9825 memory
boards, the HP41 machine code programming info (think of things like the printer
controller IC), etc.

-tony