Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!sco!seanf
From: seanf@sco.COM (Sean Fagan)
Newsgroups: comp.arch
Subject: Re: DMA on RISC-based systems
Message-ID: <2822@scolex.sco.COM>
Date: 4 Jun 89 22:27:04 GMT
References: <46500067@uxe.cso.uiuc.edu> <28200325@mcdurb> <2819@scolex.sco.COM> <1429@dell.dell.com>
Reply-To: seanf@scolex.UUCP (Sean Fagan)
Organization: The Santa Cruz Operation, Inc.
Lines: 28

In article <1429@dell.dell.com> sauer@dell.UUCP (Charlie Sauer, ) writes:
>In article <2819@scolex.sco.COM> seanf@scolex.UUCP (Sean Fagan) writes:
>>Well, more than 20 years ago, a machine was built which had smart I/O ...
>>...
>>For those of you who haven't guessed, the machine was the CDC Cyber,
>>designed (chiefly) by Seymour Cray (God).  The machine I played on mostly
>>was a Cyber 170/760, ...
>
>Until I got to the punch line, I was sure you were going to say "CDC 6600,"
>which was the first of that series of machines.
>but it seems like you would have
>to say 6600, or at least 7600, to make the "more than 20 years" accurate.

For all intents and purposes, they're the same machine.  However, the 760 is
*much* faster than the 6600 (the 760 is the second fastest 170 machine; the 
fastest being one that has 2 processors and an extra 3 bits of addressing 
[for the OS, not user]).

They have the same architecture, but I never played on a 6600, so I had to
use what I knew.  However, what I wrote is still true for the 6600.

Also, note that I said "the machine was the CDC Cyber," but that the model 
"I played on mostly" was the 760...

-- 
Sean Eric Fagan  |    "[Space] is not for the timid."
seanf@sco.UUCP   |             -- Q (John deLancie), "Star Trek: TNG"
(408) 458-1422   | Any opinions expressed are my own, not my employers'.