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From: mdr@reed.UUCP (Mike Rutenberg)
Newsgroups: comp.sys.mac.programmer
Subject: SE/30 Graphics -- How it appears to be organized
Keywords: SE/30
Message-ID: <11978@reed.UUCP>
Date: 2 Mar 89 00:02:39 GMT
Reply-To: mdr@reed.UUCP (Mike Rutenberg)
Organization: Reed College, Portland OR
Lines: 16


One of the articles (?Byte) has a picture of the SE/30 motherboard and
labels the display memory.  It consists of two 24 pin dips.

I would strongly suspect that they each have 8 bit data busses and that
the 68030 just treats it as a region of 16 bit memory rather than the
usual 32 memory that it sees in the SIMMs.

This would account for the slower than MacII graphics in benchmark
results.  A 32 bit bus add-on display cards would likely be a bit faster.

Mike
-- 
Mike Rutenberg      Reed College, Portland Oregon     (503)239-4434 (home)
BITNET: mdr@reed.bitnet      UUCP: uunet!tektronix!reed!mdr
NB: Facts in this note are (of course) universal-- the opinions are just mine