22 Jul
2018
22 Jul
'18
3:43 p.m.
On 7/22/18 12:54 PM, Noel Chiappa via cctalk wrote:
You might also need a change to the device handler.? For example in
RT-11 to support the mapped window from 18bit to 22bit, the DU handler
(for a UC07) uses extended memory subroutine $MPPHY ($MPPTR)? tell the
controller what addresses to use.? $MPPHY uses Q.PAR, which is the
relocation constant for the UMR (when present).
Since this I/O isn't going through the KTJ11-B the handler at minimum
would need to modified to use $MPMEM (Q.MEM) instead, to supply (in
conjunction with Q.BUFF) the physical address.
Jerry
From: Mark
Matlock
With the 11/83 the position of the memory board
... above the CPU uses
PMI
Yes, through the C-D interconnect; described in detail here:
http://gunkies.org/wiki/CD_interconnect#Use_by_PMI
The 'above' is because the CD interconnect is not a true bus, it only
interconnected pairs of slots.
In the 11/84 the CPU is above the MSV11-JE memory
The PMI is still on the CD connector in this machine, but the PMI is wired as
a true bus on the backplane, allowing that ordering.
there are 3 Bus slots in the 11/84 above the
Unibus map board, would it
be possible to put a dual width Q22 I/O board in the second memory slot
(not the PMI side of the slot) and have it able to DMA into the
MSV11-JE?
It is speculated that this should be possible, but there are jumpers on the
backplane you'd need to pull. See the writeup here:
http://gunkies.org/wiki/PDP-11/84#QBUS_slots