Aucbvax.5294
fa.works
utzoo!decvax!ucbvax!works
Tue Nov 24 00:38:17 1981
WorkS Digest V1 #39
>From JSol@RUTGERS Tue Nov 24 00:34:45 1981
WorkS Digest Tuesday, 24 Nov 1981 Volume 1 : Issue 39
Today's Topics:
Programming Environments - Request For References
MC6800 Paging
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Date: 18 November 1981 15:05
From: Eugene Bordelon <EPB AT BTL-IHUXO>
Reply-to: ihnss!ihuxs!ihuxp!ihuxo!epb at Berkeley
Subject: WorkS Digest V1 #38: Programming environments
To: Stavros M. Macrakis at MIT-MC
I am interested in reading further about various approachs to programming
environments. Could you list (in full) some references?
Eugene Bordelon
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Date: Sunday, 22 November 1981 18:01-EST
From: FEINBERG at CMU-20C
Subject: [G.KTK: 68000 Paging]
cc: KTK at AI
This message was sent to me by a Hardware designer who is currently
working on implementing his own 68000 system. He claims you can do
totally winning paging on the 68000 without kludging two processors
together, by adding hardware to detect page faults, and signalling a
bus error which such an event takes place. If the following is true,
why did people go to such great lengths to implment paging?
Date: Friday, 20 November 1981 22:54-EST
From: Kristofer Karas <G.KTK AT MIT-EECS MIT-AI>
To: FEINBERG
Re: 68000 Paging
Howdy!
Ah, but the 68000 has something even better in that it is really
versatile; it has a BERR (bus error) interupt that can either re-run the
bus cycle in case of parity error in memory, or call a routine in the
monitor to modify the page and swap in/out virtual memory. This single
input can (under complete control of the Monitor) trigger any special
routine the user wishes when page faults or other such immediate conditions
occur. Combine this with status outputs that can tell outside hardware
(page-mappers for that matter) whether the currently running program
is Monitor (privileged) or User (ordinary) and you have the basis for a
really sophisticated virtual memory/multi user/multi tasking system with
a minimum of external hardware!
--Kris
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End of WorkS Digest
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