Path: utzoo!mnetor!uunet!tektronix!tekgen!tekigm2!klieb
From: klieb@tekigm2.TEK.COM (Kurt Liebezeit)
Newsgroups: comp.sys.m68k
Subject: NuBus advantages/disadvantages?
Message-ID: <2669@tekigm2.TEK.COM>
Date: 16 Mar 88 04:46:19 GMT
References: <390@ontenv.UUCP> <3434@cbmvax.UUCP> <4744@ecsvax.UUCP> <1069@PT.CS.CMU.EDU> <3777@cup.portal.com>
Reply-To: klieb@tekigm2.UUCP (Kurt Liebezeit)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 19
Keywords: NuBus

In article <3777@cup.portal.com> Chad_The-Walrus_Netzer@cup.portal.com writes:

>	NO! NO! NO!  NOT the NuBUS!!!!!  It is pure crap for a an
>highspeed/highpower computer, or even a lower speed/lesser power one! 
>At least, Apple's implementation of it is...  A good BUS is ESSENTIAL to
>the throughput of a machine, and the NuBUS is a MEGA blunder in this
>respect...  It will only slow things down.  I recently heard an
> [ some interesting stuff about alternative architectures deleted]

I am curious why someone would label Apple's implementation of the NuBUS
as crap. From what little I have read about the NuBUS it seems to make sense:
the assertion/sampling edges would appear to eliminate hold time problems,
and I like the way that the bus decides on cycle N who has control during
cycle N+1. What are the serious shortcomings of the NuBUS? The only thing
that I didn't care for was the fact that the Mac II NuBUS has no DMA; cards
are expected to supply their own.

Kurt Liebezeit
tektronix!tekigm2!klieb