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From: conklin@msudoc.UUCP
Newsgroups: comp.sys.m68k
Subject: Re: move sr/move ccr: is bigger better?
Message-ID: <1090@msudoc.UUCP>
Date: Thu, 29-Jan-87 04:13:44 EST
Article-I.D.: msudoc.1090
Posted: Thu Jan 29 04:13:44 1987
Date-Received: Sat, 31-Jan-87 05:22:10 EST
References: <809@imagen.UUCP> <561@elmgate.UUCP>
Reply-To: conklin@msudoc.UUCP (Terry Conklin)
Distribution: world
Organization: Michigan State Univ., Engineering, E. Lansing
Lines: 44
Keywords: logic? CCR Protection Memory Management
Summary: Just how far is (680(x+1)0-680x0) 10 steps?

I regret the ignorance I show in this request, but it seems as if I'm
missing the tip of an iceberg and since it can make the difference in
the computer system I am looking at this week (to purchase) I figure I
better ask.
 
This is a junkie to junkie question. That is, somewhere out there there
is a person who is -into- the 68xxx family, knows half the machines out
using them, and knows translations. For this qualified
indidual, I ask, "What is the difference between the 68000,the 68010
and the 68020? And throw in 68030 for good looks."
 
I'm very familiar, at many levels, with the current slew of 68000
machines. (Mac's, Lisa's, ST's.) I'm also, on a work basis, very
familiar with the results of 68020s through the fleets
Suns all over the University. So where does the 68010 come in?
 
I was under the impression that the 68010 had some degree of an on-board
MMU. However, I also here that the 68xxx family MMU is external, and
thus represents a partial bottleneck in backtracking compared to the
Intel 80x86 (x for a bad word) family which, albeit rudely, DOES give
one control over 64k segements. 
 
If the 68010 has an on-board MMU, it would seem it would make it an
-infinitely- preferable chip to the 68000. What about the 68020, is it a
super of the 68010 as well such that it can 'do what it does and more?'
 
The ultimate reason for this query is because, after seeing the OS-9,
AmigaDOS (Also multitasking, since it slows _multiple_ programs to a
crawl,) Micro-C shell and other assorted 'multitasking' setups,
I have come to the conclusion that, well, simply put, 
Unix wont run on it, reasonably. Granted, if it looks
like Unix, acts like Unix, and does like Unix, it is Unix, but it's just
not Unix enough for me. My hangup is with an MMU. Recently, I was
offered a chance at a 68010 system (2 meg of RAM) w/Unix; is this a baby
Sun in a box? Or a Sinclair on steroids? How well can something like
this, under whatever version of Unix, handle bringing in 12 300k
programs and letting them all talk to each other? (Memory can obviously
be expanded if necessary.)
 
Terry Conklin, Club Net Coordinator	"Where BBSing is more than a
..!ihnp4!msudoc!conklin			 hobby; we're on a misson from
conklin@mich-state.edu			 god!"

Club LANS (517) 372-3131		Club II (313) 334-8877