On 3/2/17 10:26 PM, Josh Dersch wrote:
On 2/27/17 10:02 PM, Tony Duell via cctalk wrote:
>From memory it handles 18 bit addressing (not 22, of course),
interrupts and
NPR (DMA). The Unibus side (quad card) goes in any SPC slot, you have to
remove the NPG jumper. It links with a pair of 40 way ribbon cables
to the
Qbus board (dual height) which goes in the 'first' slot of a Qbus
backplane,
where the CPU board wound normally go. AFAIK there are no real
restrictions
on the Qbus backplane, I have used one to hang a MINC chassis off a
Unibus
processor.
I seems to be transparent in operation. You just acccess Qbus devices
at their
normal addresses.
Cool. I managed to snag an M8217+M9403 so all I need to do is track
down/build some cabling to tie the two together (any idea what the max
length of these cables is?). I'm kind of hoping I can use it to run a
QBus SCSI controller, amongst other things. I'll report back my
findings...
Just to bring some closure to this thread, I had some time this evening
to get everything hooked up: A PDP-11/34 connected to an SB11 QBus
chassis via a DW11-B. And I've successfully booted XXDP and Ultrix-11
from a CMD CQD-200 SCSI controller installed in the SB11. Seems to work
perfectly.
Thanks for the input, everyone!
- Josh
