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Re: ISA audio in Magnum 4000pc,possibly?

Subject: Re: ISA audio in Magnum 4000pc,possibly?
From: Dominic Sweetman <>
Date: Thu, 13 Aug 1998 08:22:15 +0100 (GMT/BST)
In-reply-to: <>
References: <> <> <> <> <> <>

> On Tue, Aug 11, 1998 at 12:44:19PM -0600, Eric Jorgensen wrote:

> > Well, it has what I believe is a Fujitsu logo (has that curly
> > S thing on it that was used as an F centuries ago...

You're looking at an R4000 made by IDT (Integrated Device Technology)
and their logo is an "integral" sign.  The "G" marks the
pin-grid-array package.  The "PC" meant that this is the economy
package - the "SC" parts devoted lots of extra pins to a dedicated
backdoor cache bus, and "MC" parts had the multiprocessor bugs fixed.

IDT made a lot of the earliest R4000 chips (a typical pattern for MIPS
was that the small, fast-moving US chip makers would deliver early chips
for debug and development, and NEC would then come in and undercut
them for production.  None of the silicon vendors ever made any money
out of this at the time...)

> >     The thing is, there's no way this was a pre-release prototype
> > of the original magnum, because the original magnum was
> > Microsoft-designed box code-named Jazz. 

I think you may be confusing two histories here.  I think the Magnum
all MIPS' own work, since it was related to an earlier R3000-powered
Magnum.  Jazz was a platform for the Windows NT development at
Microsoft, which happened some time later.

Dominic Sweetman
Algorithmics Ltd

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