Path: utzoo!mnetor!uunet!husc6!bunny!cayman!brad
From: brad@cayman.COM (Brad Parker)
Newsgroups: comp.sys.m68k
Subject: Re: Apollo/Sun 68000,68010,68020
Message-ID: <903@cayman.COM>
Date: 29 Mar 88 17:13:06 GMT
References: <3b219db7.d858@apollo.uucp>
Organization: Cayman Systems Inc., Cambridge Ma
Lines: 19

From article <3b219db7.d858@apollo.uucp>, by heinzl_c@apollo.uucp (Carl Heinzl):
> This is incorrect.  Apollo DN600 (do not confuse with DN660), 400 and 420
> are all 68000 based machines.  They use an arrangement of Dual 68000
> cpus to allow preemptive multitasking.  Basically, one of the processors

No doubt 600 others will also respond to this. The issue here is not
preemptive multitasking ("What bubba meant to say was...") The issue
here is recovering from a bus error. The demand paging support (read
hardware) generates a bus error when a logical page is not mapped
to a physical page. The 68000 can not cleanly restart an instruction
stream after a bus error (not all of the processor state is stacked)

Film at 11. ;-)
-brad
-- 

Brad Parker
Cayman Systems		"You are sleeping; you don't want to believe..."
brad@Cayman.com			   - from a (yet another) Smith's tune