Article View: comp.sys.amiga.tech
Article #12696Re: Virtual Memory / doable 1.4 request / Hot links
From: Doug Merritt
Date: Tue, 16 May 1989 15:14
Date: Tue, 16 May 1989 15:14
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1346 bytes
In article <24470@agate.BERKELEY.EDU> c60c-1ea@web-1c.berkeley.edu (Yen Yuanchi Hsieh) writes:
[ deleted diagram indicating an MMU between the Amiga graphics chips and
memory ]
>graphics 'controller' + wait states = bad idea.
>
>Just ask any VGA-controller owner. :-)
It is not impossible to design a zero-wait state MMU, especially one
that might be special purpose like this (e.g. mostly intended for
chip-ram base-address flipping).
I think it's probably possible even to do it at a reasonable price.
The Amiga's clock rate is pretty slow by today's standards; that makes
it easier to conceive ways of slipping in a subsystem that appears
practically instantaneous to the rest of the system.
Doug
--
Doug Merritt {pyramid,apple}!xdos!doug
Member, Crusaders for a Better Tomorrow Professional Wildeyed Visionary
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!rutgers!apple!motcsd!xdos!doug From: doug@xdos.UUCP (Doug Merritt) Newsgroups: comp.sys.amiga.tech Subject: Re: Virtual Memory / doable 1.4 request / Hot links Message-ID: <296@xdos.UUCP> Date: 16 May 89 15:14:26 GMT References: <8905132203.AA27784@postgres.Berkeley.EDU> <17209@usc.edu> <4182@tekig5.PEN.TEK.COM> <24470@agate.BERKELEY.EDU> Reply-To: doug@xdos.UUCP (Doug Merritt) Organization: Hunter Systems, Mountain View CA (Silicon Valley) Lines: 19