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From: tim@amdcad.AMD.COM (Tim Olson)
Newsgroups: comp.sys.m68k
Subject: Re: Virtual Machine (was: Apollo (was: MINIX port to A1000))
Message-ID: <19097@amdcad.AMD.COM>
Date: Fri, 13-Nov-87 12:52:47 EST
Article-I.D.: amdcad.19097
Posted: Fri Nov 13 12:52:47 1987
Date-Received: Sun, 15-Nov-87 09:34:03 EST
References: <8711050534.AA25885@jade.berkeley.edu> <21608@ucbvax.BERKELEY.EDU> <1976@crash.CTS.COM> <2051@killer.UUCP>
Reply-To: tim@amdcad.UUCP (Tim Olson)
Organization: Advanced Micro Devices
Lines: 16
Keywords: virtual machine, emulation, 68010

In article <2051@killer.UUCP> jfh@killer.UUCP (The Beach Bum) writes:
| Interestingly enough, some manufacturer built a machine with two 68000's.
| The main 68K ran along until a page fault.  Then (and this is from memory)
| the second 68K loaded the faulted page while the first was halted waiting
| for DTACK to be asserted.  Once the page was loaded, the second 68K
| asserted DTACK for the first CPU, and then waited for the next page fault.
| 
| What machine was this?  This isn't a quiz, I'm asking the question ...

Many machines apparently used this trick before switching to a 68010. 
Valid's SCALD workstations come to mind as one...

	-- Tim Olson
	Advanced Micro Devices
	(tim@amdcad.amd.com)