Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdcad!sun!pitstop!sundc!seismo!uunet!mcvax!jurjen
From: jurjen@cwi.nl (Jurjen N.E. Bos)
Newsgroups: comp.sys.mac.programmer
Subject: Re: questions on use of math chip by SE/30
Keywords: SE/30 68882 SANE precision
Message-ID: <7918@boring.cwi.nl>
Date: 21 Feb 89 20:41:45 GMT
References: <3263@uhccux.uhcc.hawaii.edu> <1289@ccnysci.UUCP> <70359@ti-csl.csc.ti.com> <1303@ccnysci.UUCP>
Organization: CWI, Amsterdam
Lines: 14

In article <1303@ccnysci.UUCP> alexis@ccnysci.UUCP (Alexis Rosen) writes:

>There is something that I would like to know which has not been mentioned
>anywhere yet that I know of. How is the video implemented on the SE/30?
>Does it look like a Nubus Card, did they fake it another way, or what?

They do it the fastest way possible: dual-port RAM.
(For less than wizards: this is some weird kind of memory where you can
access two addresses exactly simultaneously: one for the scanning and
one for the processor.  It requires a lot of pins on a chip, so it is costly,
but it works.)
For more details, read the article on the SE/30 in the latest BYTE.
-- 
  -- Jurjen N.E. Bos (jurjen@cwi.nl)