NetNews Usenet Archive 1993 #3/NN_1993_3.iso/spool/comp/sys/mac/hardware/26625

Internet Message Format | 1993-01-22 | 1.8 KB

Path: sparky!uunet!usc!nic.csu.net!vmsb.is.csupomona.edu!cvadsgvo
Newsgroups: comp.sys.mac.hardware
Subject: Re: Motorola's 68060 for the Mac
Message-ID: <[e-mail]>
From: [e-mail]
Date: 21 Jan 93 22:25:48 PST
References: <[e-mail]>
Organization: California State Polytechnic University, Pomona
Nntp-Posting-Host: acvax1
Nntp-Posting-User: cvadsgvo
Lines: 30

the only use of mmu is virtual memory, so it is true that 68000 machine can't
use virtual memory. that does not mean there is any affect on the performance.
286 can't use virtual memory either. i could be wrong.
what i posted is some marketing thinking, it is interesting tot see how those
computer and chip companies competing with each other.
as far as i know, the top line of mac used to be faster than pcs, however, p5
might change the picture(486 already is better than 68040 at the top speed).
that means apple will HAVE to switch to powerpc to kepp the performance
competitive. however, recent news about overheat of p5 bring some uncertainty.

In article <[e-mail]>, [e-mail] (Eric S. Smith) writes:
>
> [e-mail] writes:
>
>> somewhere i read the top man of motorola said they are
>> regret that they didn't name the 68030 as 68040, because people generally think
>> 68030 is like 386 and 68040 is like 486, actually 68030 is competitive to
>> 486.(actually, they should name 68000 as 68020 since it is competitive on every
>> erea to 286).
>
> The 68000 contains no MMU, nor is it possible to implement virtual memory
> with the 68000 - there are some instructions that could not be restarted
> following a page fault.
>
> -----
> Eric Smith
> [e-mail]
> CI$: 70262,3610
>
>