[Coco] Re: [Color Computer] 68881/68882 & the CoCo
bdevries at gil.com.au
Wed Feb 8 18:10:50 EST 2006
The manual for the MC68881 can be had here:
This describes the pin connections.
Regards, Bob Devries, Dalby, Queensland, Australia
Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.
my blog: http://bdevries.invigorated.org/
----- Original Message -----
From: "Gene Heskett" <gene.heskett at verizon.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, February 09, 2006 8:47 AM
Subject: Re: [Coco] Re: [Color Computer] 68881/68882 & the CoCo
> On Wednesday 08 February 2006 17:26, Alex Evans wrote:
>>On Feb 8, 2006, at 12:19 PM, Mike Pepe wrote:
>>> Gene, sounds like you're on my wavelength.
>>> I'm not sure how practical this is, but the bus interface seems
>>> straightforward, though completely emulating the 68020 co-processor
>>> protocol would be difficult-- but probably not necessary.
>>> I'm just curious to see if it can be done. It may prove to be an
>>> interesting experiment to see how much faster the FPU is than the
>>> math library.
>>Quite a number of years ago, there was someone on the listserv who
>>had claimed to have connected a 68881 to his CoCo. Supposedly there
>>is an 8-bit mode for it (I guess so that you can attach it to a
>>60008), and even a simpler mapping mode than the normal 68020 mode.
> Now thats an even better idea. The interfaceing should be even simpler,
> even if it is slower by an half an order of magnitude. I don't suppose
> you recall the name of this person Alex? No use re-inventing the wheel
> if theres a known good model for a pattern. Next Q though, can 68881's
> still be had? Pretty jurassic.
> Cheers, Gene
> People having trouble with vz bouncing email to me should add the word
> 'online' between the 'verizon', and the dot which bypasses vz's
> stupid bounce rules. I do use spamassassin too. :-)
> Yahoo.com and AOL/TW attorneys please note, additions to the above
> message by Gene Heskett are:
> Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
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