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Article #1639

Re: DECSYSTEM 20

#1639
From: John Moore
Date: Sun, 23 Jul 1989 14:50
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In article <19835@louie.udel.EDU> nelson@udel.EDU (Mark Nelson) writes:
]In article <3256@wpi.wpi.edu> jhallen@wpi.wpi.edu (Joseph H Allen) writes:
]>
]>A question for those old diehard dec fans...  We (WPI) used to have a
]>DECSYSTEM 20.  One interesting thing about the DEC 20 (and I guess DEC 10 and
]>pdp-6 as well) is that the registers are the first 8 or 16 locations in the
]>main memory map.  Does anyone know if code can be run in the registers?  And
]>if so, does it execute any faster than if it was in normal memory?
We used to have KA, KI and KL 10's. The KA and KI's both ran the TOPS-10
idle process completely in the registers. I think this was to avoid
tiring out the (originally core) memory, and to avoid memory contention
in closely coupled dual-processor configurations.
-- 
John Moore (NJ7E)           mcdphx!anasaz!john asuvax!anasaz!john
(602) 861-7607 (day or eve) long palladium, short petroleum
7525 Clearwater Pkwy, Scottsdale, AZ 85253
The 2nd amendment is about military weapons, NOT JUST hunting weapons!
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!asuvax!anasaz!john
References: <3256@wpi.wpi.edu> <19835@louie.udel.EDU>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!asuvax!anasaz!john
From: john@anasaz.UUCP (John Moore)
Newsgroups: comp.arch
Subject: Re: DECSYSTEM 20
Message-ID: <442@anasaz.UUCP>
Date: 23 Jul 89 14:50:44 GMT
References: <3256@wpi.wpi.edu> <19835@louie.udel.EDU>
Reply-To: john@anasaz.UUCP (John Moore)
Organization: Anasazi Inc, Phoenix AZ
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