Article View: comp.arch
Article #1553Re: DECSYSTEM 20
From: Matti Jokinen
Date: Sun, 16 Jul 1989 19:53
Date: Sun, 16 Jul 1989 19:53
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1060 bytes
>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? Yes, it could be done and it was considerably faster at least in the older DEC-10 models. I remember reading that a separate register set was not an essential part of the architecture --- if it was removed, the first 16 words of the main memory were used instead and the machine still functioned correctly, only more slowly. -- Matti Jokinen
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!leah!albanycs!crdgw1!uunet!mcvax!kth!draken!tut!tucos!mojReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!leah!albanycs!crdgw1!uunet!mcvax!kth!draken!tut!tucos!moj From: moj@utu.fi (Matti Jokinen) Newsgroups: comp.arch Subject: Re: DECSYSTEM 20 Message-ID: <929@tucos.UUCP> Date: 16 Jul 89 19:53:46 GMT References: <3256@wpi.wpi.edu> Reply-To: moj@polaris.utu.fi (Matti O. Jokinen) Organization: University of Turku, Finland Lines: 12