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Wanted: Info on Interfacing FPP's to M68k's [message #116980] Mon, 23 September 2013 14:33 Go to next message
johnrk is currently offline  johnrk
Messages: 4
Registered: September 2013
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Junior Member
Message-ID: <118@mot.UUCP>
Date: Wed, 6-Mar-85 18:40:39 EST
Article-I.D.: mot.118
Posted: Wed Mar  6 18:40:39 1985
Date-Received: Fri, 8-Mar-85 04:33:17 EST
Organization: Motorola Microsystems, Phoenix AZ
Lines: 14
Xref: watmath net.micro:9618 net.micro.68k:637

I am looking for information regarding the interfacing of
*currently available* floating point processors to the
M68000 family of microprocessors.  If you have any experience,
thoughts, pointers, etc. in this area please *mail* them to me.
If enough interest is generated, I will summarize to the net.

	Thanks in advance,

	John Koehring

	{allegra|ihnp4}!sftig!mot!johnrk
	{seismo|ihnp4}!ut-sally!oakhill!mot!johnrk
	{ihnp4|amdahl}!drivax!mot!johnrk
	ucbvax!arizona!asuvax!mot!johnrk
Re: Wanted: Info on Interfacing FPP's to M68k's [message #116987 is a reply to message #116980] Mon, 23 September 2013 14:33 Go to previous messageGo to next message
johnrk is currently offline  johnrk
Messages: 4
Registered: September 2013
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Message-ID: <119@mot.UUCP>
Date: Thu, 7-Mar-85 11:00:19 EST
Article-I.D.: mot.119
Posted: Thu Mar  7 11:00:19 1985
Date-Received: Sat, 9-Mar-85 08:40:42 EST
Organization: Motorola Microsystems, Phoenix AZ
Lines: 20
Xref: watmath net.micro:9627 net.micro.68k:641

O.K. Before everybody goes off the deep end wondering what a 
Motorolan is doing looking for information regarding interfacing
*currently available* floating point processors to the M68000
family of microprocessors, let me explain.  This is for my
personal information.  I realize that Motorola is currently shipping
samples of 68881's and I applaud my coworkers in Austin for their
success.  But I also realize that there are those people that in
the past wanted to use 68000's, required very fast floating point
operations, but were not able to wait for the 68881.  I am curious
what they have done.  Consider this question asked from a historical 
perspective.  

	Boy, ask an innocent question . . .

	John Koehring

	{allegra|ihnp4}!sftig!mot!johnrk
	{seismo|ihnp4}!ut-sally!oakhill!mot!johnrk
	{ihnp4|amdahl}!drivax!mot!johnrk
	ucbvax!arizona!asuvax!mot!johnrk
Re: Wanted: Info on Interfacing FPP's to M68k's [message #117023 is a reply to message #116980] Mon, 23 September 2013 14:34 Go to previous message
henry is currently offline  henry
Messages: 287
Registered: March 2013
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Message-ID: <5210@utzoo.UUCP>
Date: Mon, 11-Mar-85 14:54:43 EST
Article-I.D.: utzoo.5210
Posted: Mon Mar 11 14:54:43 1985
Date-Received: Mon, 11-Mar-85 14:54:43 EST
References: <119@mot.UUCP>
Organization: U of Toronto Zoology
Lines: 11

> ...But I also realize that there are those people that in
> the past wanted to use 68000's, required very fast floating point
> operations, but were not able to wait for the 68881.  I am curious
> what they have done.

Many of them got this handy little application note from National
explaining how to interface the 16032's FPP chip to the 68000, and
did so...  [sound of gnashing teeth from the direction of Austin]
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry
Re: Wanted: Info on Interfacing FPP's to M68k's [message #118065 is a reply to message #116980] Sun, 17 March 1985 05:26 Go to previous message
davet is currently offline  davet
Messages: 26
Registered: May 2013
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Article-I.D.: oakhill.360
Posted: Sun Mar 17 05:26:37 1985
Date-Received: Mon, 18-Mar-85 07:54:25 EST
References: <119@mot.UUCP> 
Reply-To: davet@oakhill.UUCP (Dave Trissel)
Organization: Motorola Inc. Austin, Tx
Lines: 28
Xref: watmath net.micro:9745 net.micro.68k:678
Summary: 

In article <5210@utzoo.UUCP> henry@utzoo.UUCP (Henry Spencer) writes:

>Many of them got this handy little application note from National
>explaining how to interface the 16032's FPP chip to the 68000, and
>did so...  [sound of gnashing teeth from the direction of Austin]

[...Gnash...Gnash...]    Gnash?  Well not exactly.  Actually the apnote
business started with Hal Hindenberg (sp?) at Digital Accoustics in Orange
County who started some time ago building add-on boards for Apple 8-bit
systems with 68K on them.  He didn't want to wait for our MC68881 (which is
just coming out now) so his only other option was to get interested in
National's NS16081 Floatin-point unit.  He published an Appnote in his
notorious newsletter with the basic schematic and later condemed National for
trying to keep it a secret.  (Don't worry, he hits Motorola just as hard.)

Needless to say, we at Motorola weren't jumping up and down convincing
customers to hook on a National chip to our 68Ks. However, after some time
elapsed management views softened and we actually prettied up our own version
and made copies to give out to customers when necessary.

There wasn't much demand since we have a blazing software single-precision
floating-point (not IEEE though) which satisfied a lot of customers, and
the delays on the national chip also kept the pressure off somewhat.

Its interesting to hear that National may be giving out an apnote now as well.

Motorola Semiconductor Inc.                Dave Trissel
Austin, Texas              {ihnp4,seismo,gatech}!ut-sally!oakhill!davet
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