27 Oct
2013
27 Oct
'13
7:44 a.m.
On Saturday, 26 October 2013, Jerome H. Fine <jhfinedp3k at compsys.to> wrote:
Just a suggestion, but you might mean 11/84 instead of
11/93.
Both the 11/93 and 11/94 support ONLY memory on the CPU
board. The 11/83 is all Qbus and uses Qbus PMI memory. The
11/84 is very special and uses special PMI memory that is ONLY
for an 11/84 system.
Hmm, it was my understanding that the M8190-A* J11 CPU boards were usable
as an 83 or 84. The difference between an 83 or 84 being that the 84 has a
KTJ11 (M8191) Q-U bridge. Same with the 93 and 94 also only differing in
the 94 having the KTJ11 board. That information is based on the module
field guides on can find across the net.
In terms of 93/94 PMI memory usage, I assumed they would support such,
since not all 9* processors had the full 4MB on card, and they needed to
speak with the KTJ11 card.
However, with the uVAX II, there is also a cable over
the top
connecting the CPU to the memory, so perhaps the CD portion
of the ABCD slot is not used in the same manner as with a
PDP-11/83.
Correct uVAX II had an over the top cable, hut it still used the CD
interconnect, I'm pretty sure. (I.e. For its own uVAX II specific uses.)
As far as I remember, all quad CPU boards which use
the J11
chip (11/53, 11/73, 11/83 and 11/93) may be inserted into
an ABAB slot and the memory below it will then be used as
normal memory. I do not know about the use of PMI memory
in an ABAB slot, but I definitely have placed a KDJ11-BF in a
VT103 which is definitely an ABAB slot with a 4 MB quad memory
board below it. RT-11 reported the CPU as PDP-11/73 in that
case.
Hmm, I was informed that a KDJ11-BF (M8190-AE, 11/83 or 11/84 processor,
clock at 18 MHz, and FPJ11A FPU installed) would not work in a Q22/Q22
serpentine backplane, and that it would release the magic smoke (unless one
were to cut the traces to the PMI fingers, or something equally radical
involving changing the CPU board or the backplane). That's the primary
reason I've been searching for a KDJ11-AC (M8192-YC, LSI-11/73 dual wide
processor, with FPJ11A FPU) and 22-bit boot ROM board, since I specifically
cannot use the M8190 in my H9275, while the M8192 would work fine.
Based on what I was told at least.
Also, with all of this discussion of ABCD slots and
PMI memory,
most, maybe all, M8190 boards also support the use of PMI
memory if placed in ABCD slots with the CPU below the memory.
They will run a bit slower than an actual KDJ11-BF with the
18 MHz crystal (as opposed to a 15 MHz crystal), but the PMI
memory provides most of the increased speed. So if anyone
has actual PMI memory (at one point maybe over 10 years ago,
PMI memory was no more expensive than regular memory maybe
due to lack of demand and understanding) and with an M8190-BB
board and a BA23, they will work well together.
Isn't that configuration (PMI processor, non-PMI RAM) the so called
"11/73B"? In either case, I personally don't have any capability for PMI,
and OP's machine also sounds like PMI would not work on it.
Plus, haven't PMI prices skyrocketed? Then again I'm looking for an
MSV11-QC (i.e. 4MB QBUS memory) board, so I shouldn't mention large and
expensive prices.
Cheers,
Christian
...Who is still looking for an M8192-YC (it must be an M8192-YC (you know,
the one with the FPJ11 installed), M8192-YB and M8192-YA not accepted), and
some 22-bit boot ROM board (M8012 is fine, if its a 22-bit revision) to
trade for n M8190-AE.
--
Christian M. Gauger-Cosgrove
STCKON08DS0