2 Mar
2017
2 Mar
'17
10:26 p.m.
On 2/27/17 10:02 PM, Tony Duell via cctalk wrote:
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...
Thanks,
- Josh
On Tue, Feb 28, 2017 at 4:32 AM, Josh Dersch
<derschjo at gmail.com> wrote:
Yeah, the VS11 drawings have the M8217 schematics, so that's useful.
It'd be nice to find an actual manual, but it's a good start.
Hi all -
Anyone have any technical information (manuals, schematics, etc.) for the
DEC DW11 UNIBUS->QBus interface? I'm curious to know what it's capable of
I am pretty sure I have the printset for it somewhere. I think the
VS11 prints also
include it (the VS11 is a VSV11 with said interface to allow it to be
used on the
Unibus). and what the requirements are, especially on the
QBus side of things. What
kind of backplane is required? I assume it doesn't support 22-bit QBus
devices given the age of the interface (and the complexity required to do
so), but does it handle 18-bit devices, or only 16?
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.
-tony