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Re: XZ graphics specs...

To: "William J. Earl" <>
Subject: Re: XZ graphics specs...
From: John Michael Clemens <>
Date: Thu, 13 Jan 2000 22:56:25 -0500 (EST)
In-reply-to: <>
On Thu, 13 Jan 2000, William J. Earl wrote:

>        Basically, XZ hardware documentation is not available outside SGI.
> We have agreement inside SGI to provide some information, if a volunteer
> inside SGI appears to track it down, but no volunteer so far.  

:), I kindav figured as much, but it never hurts to ask.  I'd
volunteer to come work at SGI to do it to, but my resume I sent there
seems to be .. umm.. ignored.

> The problem
> is that the hardware interface is quite complex, and some of what one
> thinks of as hardware is really firmware, a basic version of which is
> downloaded by the PROM at startup time.  An X server could rely on the
> PROM-loaded firmware, but it still takes quite a bit of code to set up
> the hardware.  

Would there be enough in this firmware to do a basic text console?  even
that would be better than soldering together a serial cable to run over

> Note that XZ, like Newport graphics on Indy, does not
> have a CPU-addressable frame buffer, so you have to use the rendering 
> interface.

Would this be at all analgous to the code I saw poking around the Xfree
tree once that implemented a server for the Voodoo(2) 3D-only cards?
For that matter, how closely related are the XZ and XL?

thanks for the info.

on an unrelated note: I'm slightly confused... is the R4400-Indigo2 32 or
64 bit?

thanks again,

- --
/* John Clemens _/ "I Hate Quotes"       */
/* ICQ: 7175925           _/    -- Samuel L. Clemens */ 
/* RPI Comp. Eng. 2000, Linux Parallel/Network/OS/Driver Specialist     */

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