20 Jun
2014
20 Jun
'14
2:44 p.m.
On 20/06/2014 01:42, Peterson, Roe (LAI) wrote:
Does anyone have RT-11 actually running with two MSCP
disk
controllers?
My 11/83 has a CMD CQD220A/TM at 172150, and an RQDX3 at 160334. The
rqdx3 has an rx33 floppy drive, and is set for starting LUN 4.
No matter what I do, RT-11 simply won't see the floppy.
I think but am not 100% sure I've run RT-11 with two MSCP controllers,
but I do know that the RT-11 DU: driver before 5.2 (or was 5.2 the last
broken one?) is broken and doesn't recognise an RQDX3 properly. I spend
a week once, tracking that down and making a patch for it. In essence,
the earlier drivers assumed a status register would be zero after
initialisation (which it is on RQDX1 and RQDX2), and checked for that
instead of checking the specific bits the MSCP spec calls for. One of
the other bits is non-zero on an RQDX3.
--
Pete Peter Turnbull
Network Manager
University of York