Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!stan!wcfields!nm
From: nm@wcfields.Solbourne.COM (Nick Mati)
Newsgroups: comp.arch
Subject: Re: Sun/Sparc FPUs
Keywords: FPU Abacus Weitek
Message-ID: <1990Jan15.223217.6592@Solbourne.COM>
Date: 15 Jan 90 22:32:17 GMT
References: <158@csinc.UUCP> <787@stat.fsu.edu> <42701@lll-winken.LLNL.GOV> <4411@crdgw1.crd.ge.com> <47516@sgi.sgi.com> <25669@cup.portal.com> <1794@murdu.oz>
Sender: news@Solbourne.COM
Reply-To: nm@wcfields.UUCP (Nick Mati)
Organization: Solbourne Computer, Inc.
Lines: 11


The Solbourne Series5 machine uses the Weitek 3171 FPU (Abacus) at 33.33 MHz. 
The 3171 is similar to the 3170 except that it has a Cypress CY7C601 (IU) 
interface wrapped around it instead of a Fuji/LSI Logic interface.  Running
the same code, the performance of the 3171 is basically the same as the TI8847 
which is used in the Sun 4/490, the only difference being the TI8847 requires 
an extra interface chip to talk to the IU.  Solbourne's Series4 uses a Weitek
1164/65 chip set.

Nick Mati
CPU Design Group - Solbourne Computer, Inc.