26 Feb
2003
26 Feb
'03
12:41 p.m.
There are more then 1 variety of 40Mhz math coprocessors. Back when my main
computer was a 386 in the early 90's I purchased the Cyrix version for my
AMD 386/40DX and it crunched nubers very well (funny how cyrix went from the
fastest FPU unit in the 386/486 days to the WORST during the pentium period
when it mattered).
I currently have a 386dx/40 and a math coprosessor but I dont think its a
cyrix (using it for a dos game rig) Did IIT make them also?
----- Original Message -----
From: "Robert F. Schaefer" <rschaefe(a)gcfn.org>
To: <cctalk(a)classiccmp.org>
Sent: Wednesday, February 26, 2003 7:48 PM
Subject: Re: AMD or Intel 80387 Math Coprocessor IC
----- Original Message -----
From: "Philip Pemberton" <philpem(a)dsl.pipex.com>
To: <cctalk(a)classiccmp.org>
Sent: Wednesday, February 26, 2003 5:43 PM
Subject: WTD: AMD or Intel 80387 Math Coprocessor IC
in
Hi all,
I'm trying to track down a 387 math coprocessor IC for an old
386-based
Linux box that's going to be doing a bit of
numbercrunching for me. Has
anyone here got an AMD or Intel (AMD preferred) 387 coprocessor rated at
40MHz (-40 part number suffix) that would work correctly with an AMD
Am386DX-40? No, before you ask, the 386DX does *not* have a built in
mathco - the 486DX was (IIRC) the first DX-series chip with a built-in
coprocessor.
They come up on epay all the time, pick yer flavor. I just got a 40MHz
Cyrix Fasmath chip for $2 (includes $1 shipping) a week ago. Supposedly
clock for clock it's the fastest of the '387 FPUs, but IDK. Popped right
to to my P70.
I'm still looking for a set of eight 2MB 72 pin IBM SIMMs with presence
detect, and a Cyrix 486Drx2, which is a 486 with a '386 pinout, if anyone
has a spare.
Thanks.
--
Phil.
Bob