Article View: comp.sys.dec.micro
Article #1776Re: Micro VAX I
From: Carl Lowenstein
Date: Thu, 01 Jun 1989 23:20
Date: Thu, 01 Jun 1989 23:20
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In article <18702@vax5.CIT.CORNELL.EDU> oyej@vax5.CIT.CORNELL.EDU writes:
>I am looking for information as to why the micro VAX I is unpopular.
>I believe that a major hardware design flaw is the reason that one doesn't
>hear about it anymore.
The MV1 does not have hardware for address mapping between DMA peripherals
and memory. It would be a good trick to do so, since there is only one
Qbus for everything.
Storage which appears to a program as contiguous space (virtual addresses)
need not be at contiguous physical addresses in the Vax architecture. This
greatly complicates transfer to and from mass storage devices such as disks
and tapes when there is no hardware help. Probably that is the design flaw.
--
carl lowenstein marine physical lab u.c. san diego
{decvax|ucbvax} !ucsd!mplvax!cdl
cdl@mplvax.ucsd.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!ucsd!sdcc6!mplvax!cdl From: cdl@mplvax.EDU (Carl Lowenstein) Newsgroups: comp.sys.dec.micro Subject: Re: Micro VAX I Keywords: micro-VAX I, hardware Message-ID: <876@mplvax.EDU> Date: 1 Jun 89 23:20:51 GMT References: <18702@vax5.CIT.CORNELL.EDU> Reply-To: cdl@mplvax.ucsd.edu.UUCP (Carl Lowenstein) Distribution: usa Organization: U.C. San Diego, Marine Physical Laboratory Lines: 17