[Coco] Re: [Color Computer] 68881/68882 & the CoCo

[Bob Devries]

The manual for the MC68881 can be had here:
http://www.datasheetcatalog.com/datasheets_pdf/M/C/6/8/MC68881.shtml
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.

website: http://www.home.gil.com.au/~bdevasl
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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