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From: motsea@amc.UUCP (Motorola Seattle )
Newsgroups: comp.sys.m68k
Subject: Re: MC68030 & MC68882 now out and available; comparisons with MC68020?
Message-ID: <542@amc.UUCP>
Date: Fri, 30-Oct-87 14:11:20 EST
Article-I.D.: amc.542
Posted: Fri Oct 30 14:11:20 1987
Date-Received: Wed, 4-Nov-87 23:25:02 EST
References: <4733@elroy.Jpl.Nasa.Gov>
Reply-To: motsea@amc.UUCP (Motorola Seattle (guest account))
Organization: Applied Microsystems Corp., Redmond, WA.
Lines: 29
Keywords: 68030 68882  68020 68881

In article <4733@elroy.Jpl.Nasa.Gov> earle@jplopto.JPL.NASA.GOV (Greg Earle) writes:
>The new EDN shows a Motorola VME board with a 20 MHz 68030 and 68882 FPU on
>it.  It has 256Kb on board and I believe 2 serial ports and PROM debugger.
>Now that it's no longer vaporware, can someone (preferably from Motorola)
>comment on the differences between the 68030 and 020, and also the 882 vs. 881?

The 68030 incorporates a subset of the 68851 PMMU onchip, as well as an added
logical data cache, on-chip Harvard architecture [independent busses for both
instructions and data], and modified bus interface logic to allow 2 clock
synchronous access, burst filling of caches using nibble mode rams, as well
as the 3clock async bus interface. It is not a drop in replacement for the 020.
The 68882  *** IS *** a drop in replacement for the 68881. By reconfiguring
the internal architecture [primarily in floating point register access], it
is able to achieve typically 50% better performance than an 881 [all other
factors being equal], and can go 2x with minor code mods...

>
>Thanx,
>
>	Greg Earle		earle@jplopto.JPL.NASA.GOV
>	S(*CENSORED*)t		earle%jplopto@jpl-elroy.ARPA	[aka:]
>	Rockwell International	earle%jplopto@elroy.JPL.NASA.GOV
>	Seal Beach, CA		...!cit-vax!elroy!smeagol!jplopto!earle

			...mark konopacky   fae   motorola  seattle
			email: ...uw-beaver!tikal!motsea!mark

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