On Mon, Nov 24, 2003 at 10:30:28AM -0800, systems engineer wrote:
> crimson shares lineage with older powerseries (4D/XXX) systems.
> documentation may still exist, but i doubt any of us will ever see it --
> the support folk still have some of these antiques in their lab, and the
> source trees are certainly still around, but that's not much help :(

Yes, the irix trees exist and there is internal correspondence
and likely other soft-copies of interesting tid-bits. Some very
kindly SGI engineers don't mind referring to these things to answer
generalized questions, but getting direct access or detailed
explanations isn't something we may expect. 

I took a look at Crimson includes in irix, and it appears to
utilize lance ethernet and the same good ole wd33c93 scsi
controller. A fair bit of the hardware support is in tree, but I
haven't a clue how DMA is done with the IO{2,3}. Maybe it wouldn't
be terribly difficult to get it booting and do PIO.

Steve