[Simh] Fixing the FP11's use of MMR1

[Paul Koning]

> On Nov 13, 2018, at 3:45 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
> 
> On Tue, Mar 24, 2015 at 5:07 PM Bob Supnik <bob at supnik.org> wrote:
>> This issue, pointed out by Johnny Billquist, has been hanging fire for
>> years.
>> 
>> Fixing the FP11's use of MMR1 - implementation proposal
>> 
>> As has been noted, the FP11 does not update MMR1, ever....
> 
> This was very interesting and educational to read, but when does it
> matter?  Diagnostics?  Are there any live programs that depend on this
> behavior?

Interesting question.  FWIW, RSTS does not use MMR1.  It saves it in crash dumps but never touches it anywhere else.

	paul