Thanks alot for your advices and the links, Ethan.
No. There are 1MB boards for the 11/24, but they are
somewhat odd,
IIRC. I have an 11/24 at home with a KT24 (M7134?) Physical Address
eXtension (PAX) board that lets you put more than 256K of memory in
the 11/24, giving it a slight edge over the 11/34, at least in terms
of max memory (the 11/34C might be able to crunch numbers a bit
faster).
I reasonably confident that the 11/24 and 11/44 used the same memory.
For 256K boards, it should be the M8722 (MS11-MB). Grubbing around on
http://www.pdp11.co.uk/search/modules.ehtml?name=ms11&submit=Search
seems to suggest that the 1MB version is the M8743 (MS11-PB), but I
don't have my hardware close at hand to check my own machines. Max is
4MB (as with any 22-bit address bus).
My 11/24 _uses_ the KT24 Mapping Module with the suggested MS11-PB, giving it 1MB of ECC
Memory.
I can guarantee, that this combination works :^)
There's another board, I own: a MS11-LB (M7891-BB) with 128kb.
But I suppose that it doesn't make much sense to put this one together with the
MS11-PB. The Ms11-PB is certainly
much faster than the MS11-LB.
Unfortuantely, the National Semiconductor boards can't be used, they were built for a
VAX 11/750...
Currently, I have some problems to get this baby work.
There is a strange malfunction: When typing in some letters or digits on the keyboard
(VT420), the screen turns
out some sort of random characters at the @-pormpt.
It's very weird !
Sometimes, when I turn it off and on to give it another try, it becomes impossible to type
something.
The prompt is waiting, the cursor's blinking and the machine try to bootstrap, when
pushing the boot-button,
but I simply can't type in anything !
The grant und bus connections are closed. The terminal works perfectly on local mode.
The "Clock" LED is on, in fact, never turns off, while the 1-LED (the one next
to the Clock-LED) turns on when the PROM
for the CPU diagnostic is loaded (@165004g).
After that, both LEDs remain on.
The Maintenance Card for the 11/24 isn't on the internet (at least, I didn't find
it), and there, the LEDs functions are described.
Could anybody give me some help on this ?
Pierre
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