Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!ames!elroy!peregrine!ccicpg!felix!kehr
From: kehr@felix.UUCP (Shirley Kehr)
Newsgroups: comp.sys.mac
Subject: Re: Color Video board for SE/30
Message-ID: <87436@felix.UUCP>
Date: 15 Mar 89 15:54:42 GMT
References: <1237@deimos.cis.ksu.edu> <273@jolnet.ORPK.IL.US> <21611@agate.BERKELEY.EDU>
Sender: daemon@felix.UUCP
Reply-To: kehr@felix.UUCP (Shirley Kehr)
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In article <21611@agate.BERKELEY.EDU> bmug@garnet.berkeley.edu (BMUG) writes:
 
<It could very well be that Apple chose not to produce video boards
<of any type for the SE30 (even ones connecting their own just-announced
<monitors) in order to encourage third parties to produce entire lines
<of video boards for this machine (from 2-bit mono to 32-bit color).
<There isn't any question that there will be a pretty good market
<for these products.
<
<John Heckendorn
                                                              /\
Well, if you can believe things you read in the Macintosh II Report 
(Thom Hogan and Michael Swaine), they say that E-Machines has uncovered
a nasty bug in the Apple hardware while testing their 24-bit color card.
It seems the HMMU (that occupies the spot where you will put the PMMU)
does the translation between 24-bit and 32-bit. It loses any interrupt request
that was pending when it switches from one mode to the other.  The result
is a hang.

They say this problem doesn't occur with PMMU or 030s. They urge Apple
to go ahead and release the 24-bit color board and require a PMMU. Of
course, they suggest some price adjustments to make it less painful.

Shirley Kehr