15 Apr
2013
15 Apr
'13
6:22 a.m.
On 04/15/2013 06:01 AM, allison wrote:
Nope...11/53 is a J11 on a *completely different* CPU board, which
includes onboard memory.
Nope.
When you say PDP-11/53 your talking a system designator. If you start
talking the CPU only
you use different terms like KJA11.
Well, YOU do. ;) I nod to your vast DEC experience and former employment,
but I do have a bit myself. "11/53 as a system designator" is open to
interpretation, IMO. What other machines were KDJ11-D boards used in, for
example? Except, of course, for the DECserver-500 and -550, but that
"barely" counts, as the ROMs are different.
There's also the bizarreness over "what constitutes an 11/83"...is it
18MHz
vs. 15MHz, or PMI vs. non-PMI? Most (all?) quad-wide 15MHz KDJ11-B boards
support PMI memory, so the distinction can't just be "supports PMI"...but
howabout "populated with PMI?" It's not just 15MHz vs. 18MHz, as very late
11/73s shipped with 18MHz CPUs.
DEC didn't always do things consistently, and they didn't always follow
their own rules.
A BA23 or
BA123 chassis. Would others work as well?
A CPU with separate I/D space. 11/23, 11/53, 11/73, 11/83 or 11/93
would work with the Q-bus chassis above.
the 11/53 is a system designation. the CPUs are F11 (11/23),
J11 (11/73, 83, 93). Oh, PDP-11/53s aka Micro-11 in the ba23
pedestal case
I have one of those here, not in the pedestal shroud though; it's in a
rack. I like that system a lot; it's running RSTS/E v10.1 on an RD54 with a
TSV05.
was often a KDF11B or as some here call it an 11/23+.
There's also a BA11-SA labeled "PDP-11/23 PLUS".
And yes there are several boards that are J11 cpu with
and without memory
(and PMI memory).
I have a few. Both the initial KDAJ11 and later.
Same here.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA