I have the UDA50 manual (BTW: anyone have a UDA50?) that I can
copy for you. I would assume that peeking into the Ultrix 4.2
source code could be of great help. If there are any copyright
issues, one could make a cleanroom reverse engineering approach,
where someone sits down and writes an english document that
describes what happens with the protocol and someone else re-
implements it. But I heard someone was working on getting Ultrix
to be open source, in which case one could port massive amounts
of DEC hardware support over, including XMI.

However, I thought that NetBSD already supports RA disks, so,
the MSCP protocol should be there. Also, the 4.3 BSD sources
include MSCP devices, so there is source to peek into, right?

regards,
-Gunther

Jochen Kunz wrote:

> Hi.
> 
> Now that my RX01/02 driver for NetBSD and the accompanying "NetBSD
> device driver writing HOWTO" is nearly finished, I am looking forward
> for further challenges. I think will stay in the disk (and tape)
> department and write support for DSSI. I know that this is not a trivial
> task, but I will give it a serious try. So I have the usual problem:
> docs. 
> 
> I need docs about DSSI, the protocols that are used on it, the host
> adapter chips (SII and  SHAC), MSCP, SCS,  ... The KA6[46789]0 CPU and
> KDA50 / UDA50 programmers manuals should be a good start. So if this
> docs are online somwhere on the net, please give me a link. 
> 
> Thanks for your help. 
> 


-- 
Gunther Schadow, M.D., Ph.D.                    gschadow@regenstrief.org
Medical Information Scientist      Regenstrief Institute for Health Care
Adjunct Assistant Professor        Indiana University School of Medicine
tel:1(317)630-7960                         http://aurora.regenstrief.org