DEC 11/45 build - advice sought, parts requested possibly.
ard at p850ug1.demon.co.uk
Fri Jul 8 18:11:17 CDT 2005
> Ok, so I have a working processor, and a basement full of peripherals. I'm
> not sure which way to go with the rest of the build. I'm not really up on
> DEC stuff I admit, so maybe others here can offer me some advice as to what
> is the best way to proceed.
> My 11/45 (11/45-CA actually) has the KB11-A processor, no FP. It's the older
> style with the power distribution board on the back wall of the cpu cabinet
OK, mine is like that. I rebuilt the power harness to give me an extra 5V
feed from another regulator block to the expansion backplanes. The stock
system is a bit current-limited there.
> rather than on top. However, it's also got the newer 861A power control in
> the bottom rather than the dual 860's in the top. There is the two H742A's
> as well. I have one system unit installed - MF-11L in which is installed 8K
> of core. In the cpu backplane there are three unibus slots which I believe
> will take three quad? (C-F) boards. A&B in two of those slots are used for
Yes, they are standard SPC slots. Don't forget you'll have to play around
with the NPG jumper on the wire-side of the backplane if you put a DMA
device -- like an RX211 -- in one of those slots.
> the unibus A to unibus B jumper, and A&B of the last slot is the connector
> to A&B of the MF-11L. The MF-11L has a 9312 in the last A&B slot. The SPC?
> boards currently installed are two DL11's and a M7228. The ONLY board in
> slot one is a 930C terminator in A&B. I have no MMU, so slot 13 is empty and
> slot 14 has the M8116.
Pity. You really need that MMU. You are limited to 28kW of memory without
> Separately, I have a lot of peripherals to choose from. Scads of RL02's,
> DSD440, LincTape II, RX01's, RX02's, RA81's, etc. I also have a BA11-KU with
> a DD11-DK backplane in it.
> The unibus space on the cpu backplane is quite limited. At the VERY least I
> have to keep one of the DL11's there, so that leaves me with two more unibus
> slots for peripherals. I *THINK* that that standard controller for an RX02
> or RL02 takes all 6 rows (Hex cards?). However, the DSD440 controller only
The RX02 controller (RX211) is a quad card and can go in the CPU
backplane. The RL11 is a hex card though.
> takes slots C-F (quad?). The linctape II controller also only takes C-F. So,
> I think I could have a reasonable system by putting the DSD440 controller,
> LincTape controller, and a DL11 and be done with it. However, I then am
> limited to using core memory in the MF11. At the very best, I can get...
YOu have space for 3 'system units' behind the CPU backplane. The MF11,
IIRC, takes up 2 of them. You can fit a 4-slot backplane in as well. If
you are mildly eccentric, you can wire-wrap said backplane to be 2 quad
SPC slots, 2 hex SPC slots with MUD wiring on the top 2 connectors. That
might be enough for you.
> what... 32K in a MF11? I think I can get the additional core boards. But
> correct me if I'm wrong but isn't sticking with core (max 32K) going to make
> my operating system choices extremely limited? I'm guessing I can't run RSTS
> or Unix on it with that kinda memory. vtserver I think requires a full load
> of 128KW. On top of it all, the DSD440 takes most of the rack depth, as does
> an RL02, so I've been advised against mounting anything above the /45 except
> maybe the linctape.
I would only put a 'short' unit immediately above the 11/45 CPU, but
above that you can put an RL or something.
> Possible solutions:
> 1) I just got a M7891 (64KW) off Ebay. I could yank out the MF-11L system
> unit, yank out the DD11-DK from the spare BA11, and install the DD11 in the
> cpu cabinet. I'd use the unibus memory M7891, ditch the core, and have a
> fair number of slots left over in the DD11. However, there's problems with
> this approach. I'd still be mounting stuff above the /45 (DSD440 & Linctape
> at the least), and maybe an RL02. In other words, this would fix the memory
> and unibus slot availability, but I believe I'd still be restricting the
> airflow/cooling too much :\ Plus I'd need to find some of those rare Mate &
> Lock connectors to get the DD11 into the /45 cabinet and do some power
The easiest place to find those connectors is to raid current-loop serial
> harness building. I guess I might need one or more regulators for this
> approach as well. Then I'd have to find/buy a KT11-C to USE the M7891 I
> think.... I'm probably talking about unobtanium stuff aren't I :|
More information about the cctalk