NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/m68k/1554

Internet Message Format | 1993-01-12 | 2.0 KB

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From: [e-mail] (Thomas J. Trebisky)
Newsgroups: comp.sys.m68k
Subject: Re: 68010
Message-ID: <[e-mail]>
Date: 12 Jan 93 20:24:24 GMT
References: <[e-mail]>
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Distribution: usa
Organization: University of Arizona, Tucson, AZ
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[e-mail] (Griff Miller X7114) writes:
>Hi. I have an Amiga 500 in which I have installed a 68010. It's the long,
>skinny one (I understand some 68000/68010's are squarish). It's also
>gray, not black (ceramic). Anyway, when I bought it I was looking for a
>16mHz version but could only find 10mHz (I think - something < 16 mHz,
>at any rate). Is there just not a 16 mHz 68010 available?

It is my understanding that the fastest 68010 ever in regular production
is(was) the 12 Mhz chip.  It is possible that selected parts might have
tested for 16 Mhz use -- hard to say.

>Also, 68010's are supposed to be able to work with a math coprocessor.
>Which one, and how is it done?

The 68010 does not have a coprocessor interface.  You could set up a
coprocessor chip as a peripheral (decoding it somewhere in the address
space).  Then you could code routines to essentially emulate the coprocessor
access via software.  You could even install these routines as handlers
for the F-line emulator traps that would result on an 010 from instructions
intended for the 68881 say.  However this buys you largely compatibility
and is not a big performance win (as you might guess).  The moral of the
story if you want performance is to go with a 68020 and 68881/2, that is
the "right way" to build an accelerator board.
--
    Tom Trebisky    [e-mail]
"Did you know that 500,000 trees are consumed in America each week
to produce our Sunday newspapers.  Never mind recycling, why even
take the paper?"