6 Apr
2013
6 Apr
'13
3:01 p.m.
On 04/06/2013 12:34 PM, Arno Kletzander wrote:
Sounds interesting, could you elaborate?
PMI (private Memory interconnect) was limited to the 11/73 KDJ11 cpus
or later.
However the 11/23 uad has jumper that need to be correct for the
backplane used
and some of the backplanes also have jumpers for the different CPUs.
yes, the dual width card only runs uODT and that means typing in a boot
every time or a TEV11, MRV11 (rom card) with valid boot. The 11/23
M8189 has three flavors and the main difference is what the on board boot
roms have for device boots. The early ones cannot boot MSCP devices
such as the RQDXn. One way to cheat that is find a set of compatible
EProms or boot RT11 from RX02 or TU58 and load a MSCP device handler
and then you can boot from the MSCP. Or MOP load via a serial (or SYNC)
port from a suitable host.
I'd thought so; perhaps I'll happen across some esoteric cards that
use them, or I'll hack something custom in there. Most esoteric cards are odd
enough that if not fully documented they may
be unsafe to even use
or they are part of a unique hardware system that used CD totally
independent of the CPU system.
I have a few like that (part of a machine control system) that require a
pair of 16bit parallel IO
board to communicate with the CPU and the CD bus only supplies power (it
has its own
interconnect over the top). FYI that was used to control a bridgeport
mill (3 axis).
The only common card set that depends on CD is RL11 The two board
RL01/02 controller
and it's only 18bit capable, if you working with 22bit system (fully
populated with ram)
then you need the RLV21 which is a single quad board and works in all
backplanes...
oh and also RL02 drives, a 40" rack minimum, plus a good back!
PPS oh, I have at least two that have all slots filled! Its way to easy
to plug in IO.
For example RLV21 quad width, RQDX3 dual, TKQ50 (dual) TK50,
RXV21 (dual) RX02 drive controller, DZV11 serial IO(quad),
LPV11 parallel printer (dual), DEQNA (dual),
full 4mb memory (3 quad boards). don't forget the CPU,
11/23B+ also a quad board.
Thats 16 slots filled plus two grant cards total 18 making a full box.
The grant cards allow for optimal board placement and are required to
keep the DMA and interrupt vector chain complete.
In the end the whole Q22 this is only an issue when you exceed 256Kbytes
of memory
as the Q22 allowed the MMU to reach 4MB of ram.
Allison
allison <ajp166 at verizon.net> wrote:
Yes, some of the backplanes and the cpu board have jumpesr that need to
be correct and matching.
ITs why in the previous I suggested that you Read The Fine Manual. The
DEC PDP11 Microcomputer
handbooks are important reference s to all this and much more. Without
them you are working blind.
I have full sets spanning the years and it fills about 5 ft (1.5M) of
linear shelf space. I consider
them as more important than the hardware. While much of it is on the
net I find it harder to
scan for a specific item like the default jumpers for DLV11J. The books
have a bit of wear
Look uo the backplan to find out its
configuration.
From my initial posting:
> It is the BA11 variety and contains a H9273 backplane, which as far as I could find
out is QQ-CD
Am I missing something here?
Also read the fine manual for the quad width
11/23 you will find there
are jumpers/switches for use in AB/CD backplanes. Most quad width cards also conform to
that.
Also from my initial posting:
> The M8189 is a quad-width board, but with the
CD part configured
> for a serpentine backplane (the manual mentions two jumpers to be removed when using
in another
> environment to avoid shorting signals together)
Am I missing something here?
from actual use.
CD lines are
needed for RL11 controller (two board RL01/02 controller).
Ah, thanks. Alas
I've already been promised the single board variety of that option.
And if all else fails you can replace the
backplane with one that is
AB/AB as I've done that many times.
Thereby sacrificing the option of
integrating any CD-dependent boards I might happen across in the future. Best idea I could
think of until now would be a mixed (Q/CD - Q/Q) layout backplane, but I do not know
whether these even exist in the required 9-slot form factor. Anyway, I think I'll
treat the backplane as a given constant right now (except from probably expanding it to
Q-22, see below) and look for the "right" boards to populate it.
David Riley <fraveydank at gmail.com> wrote:
The H9273 is perfectly compatible with an 11/23
CPU; there
is a jumper you can set for 18-bit use. Obviously, though,
turning it into a 22-bit backplane is preferable.
Fortunately, that's pretty easy.
Meh...I've been hearing that I might run
into problems with some other processors (LSI-11(/2), very early KDF11-A versions), should
I ever need to use the backplane as a test platform for one of those in the future. Is
that problem the one simply worked around with some insulating tape over the BDAL18:21
connector pads?
The M8189
is a quad-width board, but with the CD part configured
for a serpentine backplane (the manual mentions two jumpers to be removed when using in
another
environment to avoid shorting signals together), so again no "meaningful" use
of the CD lanes.
Correct. The Qbus PDP-11s only used the CD lane for PMI
(or custom logic, if you had that). I'd get
the M8189 if you
can, because it saves you the hassle of finding boot ROM
and serial cards for the console.
Good, as it seems someone found one of these for
me. What are these intended for anyway (I was thinking of
some sort of PMI predecessor, probably
wrong by now), and what boards do I need to take advantage of them in this machine?
For an 11/23, those lanes will just go unused. It's not
so bad, really; you have to try pretty hard to fill up 9
slots. If it's
in
a box labelled 11/23, though, check to make sure someone
hasn't already performed the modification.
OK, thanks!