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From: eesrajm@cc.brunel.ac.uk (Andrew J Michael)
Newsgroups: comp.os.minix
Subject: Re: MINIX on an ATARI TT
Summary: This is a hardware problem
Message-ID: <2051@Terra.cc.brunel.ac.uk>
Date: 23 Mar 91 09:29:45 GMT
References: <48126@nigel.ee.udel.edu>
Organization: Brunel University, Uxbridge, UK
Lines: 24

In article <48126@nigel.ee.udel.edu>, HBO043%DJUKFA11.BITNET@cunyvm.cuny.edu (Christoph van Wuellen) writes:

[Some stuff deleted]

> I think a severe problem might be situation where the ST polls an I/O-port
> without telling the cache to be quiet.... but I do not know if this happens
> 
> C.v.W.

This is a hardware feature which I hope Atari have got right.  The TT wouldn't
run otherwise.  It is up to the memory decoding logic to assert the CIIN pin
when in the I/O area in order to stop the cache being loaded.  Not getting
this right is a common problem when trying to put an '030 in an existing '020
system (grin) !!

Andy Michael


-- 
Andy Michael                                     "You might think that.  I
85 Hawthorne Crescent                             couldn't possibly comment."
West Drayton					    - `House of Cards'
Middlesex            email: eesrajm@brunel.ac.uk                             
UB7 9PA           or Andrew.Michael@brunel.ac.uk