4 Jan
2011
4 Jan
'11
8:14 a.m.
On 04/01/2011 15:25, Ethan Dicks wrote:
On Tue, Jan 4, 2011 at 8:17 AM, Pontus<pontus at
update.uu.se> wrote:
In order to
make room for an 11/44 I'm giving away a PDP-11/23 with two RL01
drives. I have a bunch of spare Q-BUS cards for the 11/23 and I wonder if
any of them are compatible with the 11/73.
Most will be (though the RLV11 happens to require a backplane wired
with a "CD Interconnect") > Memory: M7506, M8043, M8044, M8047, M8059, M8067
M8047: MXV11 - probably a 16Kword card w/SLUs - also
small for a large system
It's an MXV11-A, which won't have a proper diagnostic bootstrap for an
11/73 (it won't initialise everything properly for a KDJ11). You need
an MXV11-B for a KDJ11, and the ROMs aren't interchangeable (paging
hardware works quite differently). It also only supports 18-bit memory
addressing, so it would limit what else you could use.
There is a variant (Rev A) of the KDF-11 (11/23) CPU
card that can't
go above 18 bits, but I've never seen one in the field.
I've seen one but they're not common.
Every one
I've seen can work in an 18-bit or 22-bit chassis. That's the
limiting factor - what's your backplane? A post-rev-A KDF-11 in a
BA23 has no problems with being configured as a 22-bit system. It's
also possible to run wires to upgrade an 18-bit backplane to 22-bits -
many of us on the list have done that.
Yup, I did that to all mine, years ago. The other thing to check is
exactly what backplane you have in the 11/73. Is it an 11/73 in a BA11
box (looks like an 11/03 or 11/23)? Or is it a microPDP-11/73 in a
BA23/BA123 box? Check, for they have different backplanes! And is the
11/73 a dual-height (M8192) or quad-height (M8190) card? The
dual-height ones were often used as upgrades for older 11/23 systems,
but were also sold as 11/73S systems in a BA11-S box. A microPDP-11/73
is always a BA23 or BA123 box, but the quad-height boards were sometimes
used as upgrades to 11/23plus systems in BA11 boxes.
See http://www.dunnington.u-net.com/public/PDP-11/QBus_chassis
Apart from that, I second what Ethan's already said.
--
Pete Peter Turnbull
Network Manager
University of York