On Thu, 24 Jan 2002, John Maier wrote:

> > On another note, what does anyone else think of starting from the supnik
> > rqdx3 emulator?
> 
> I have already looked at the MSCP code and picked Supnik's mind on this...
> 
> Here was our dialog...
> Message 1:
> After asking him about existing docs he responded:
> Supnik > "I don't think DEC ever allowed MSCP specs out the door.  All of the third
> party controllers that emulated MSCP deliberately omited the MSCP
> programming specification, on pain of being sued.  Neither DEC nor Compaq
> has ever granted permission for MSCP specifications to be published or
> distributed."
> 
> Message 2:
> I discovered that he was using info from one of the original people one the RQDX3 project
> and probed some more...
> Supnik > "I don't think DEC ever allowed MSCP specs out the door.  All of the third
> party controllers that emulated MSCP deliberately omited the MSCP
> programming specification, on pain of being sued.  Neither DEC nor Compaq
> has ever granted permission for MSCP specifications to be published or
> distributed."
> 
> 
> So an inital offering would only support that which the RQDX3 supports.  Additional
> testing would have to be done under ULTRIX or VMS and watch to see how those OS make their
> MSCP requests and how they would handle.  This actually might help improve MSCP support
> and performance in NetBSD, in the long run.

If someone really is interested, the souces to the RSX MSCP driver is
available in the RSX distribution, so anyone who have that can read how
DEC goes about on the UDA-50/KDA-50/RQDXn on the PDP-11.

It's quite a lot of MACRO-11 code, since the driver is divided into the
device and the port driver.
And MSCP and TMSCP share the port driver.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt@update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol