[comp.sys.nsc.32k] MMU for the 32K???

gvrobert@sactoh0.UUCP (Gary V. Roberts) (11/14/88)

I am new to unix so I hope i can get this letter into the proper
place before it grows stale.

	I recall mention of someone doing real time work saying
that
he could not use the MMU.  I think that this is inaccurate.  The
person mentioned that the page MMU supported VM and this was not
deterministic, the thing is, just because you have the MMU for
protection does not mean that you have to support VM.  It can be
set up to be transparent except when the program accesses memory
that is not its own ( and this requires fixing because it is a bug
).

	As to the MMU option, back when I was designing my own 32K
system ( many years ago ), the MMU could be made removable witht
the addition of one pull up and one jumper select.  The reason this
is possible is because ( unlike the Moto--- sol'n ) the address
goes into and out of the MMU on the same pins. Although the only
real o
real problem I see with the MMU is the imposed wait state.  BTW, if
this letter seems chopped to hell, this is my first experience with
vi.

	I would be ingterested in the news letter that I heard
about.  I recall someone saying that rick put out a news letter but
I do not know which Rick or how I would get ahold of him.  I would
also appreciate any data on where I could get the latest data books
and stuff ( I am a S/W type these days and do not have access to
the resources I had as a H/W type ).

                                                 GVRoberts
 

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