23 Sep
1999
23 Sep
'99
3:17 p.m.
<Which series is most compact (sized for desktop or tower style) pdp
An 11/53 thats a 11/23 cpu in a BA23 box. About 6Wx28Hx30D and an easy
110v outlet. With a RD52(30mb) and a RX50 floppy you can run most any
PDP11 OS including unix (starting with 2.9 or 2.11).
The other choice is a BA123 (end table) with a 11/23 or 11/73 in it. Fast
and plenty of disk drives, not to hard on power(110V 600Wmax).
If you want something really low power, a PRO350 (or 380) that's a PDP11
or a PDT11/150 (tiny and very low power, less than bigger PCs).
PDP-11 line run from the really big like the 11/70 down to a single board
(falcon card T-11 cpu, 2 serial, Parallel, 2kw ram, rom, one dual card!).
So having a PDP-11 os some sort is very possible and they are all for the
most part PDP-11s differing mostly in speed, IO and maximum memory.
Allison
24 Sep
24 Sep
5:33 a.m.
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7:06 a.m.
What about a BA11-V? That's a 4 (dual-height)
Q-bus slot box. I'm sure
the backplane can be made into a Q22 one if it isn't already. Then fill
it with a CPU card, memory, serial ports and (say) a SCSI card.... Or
even use it with a TU58 (it's the same physical size as the TU58, and the
units are designed to stack).
I have three all Q22ified, only need to buss 4 lines on each socket and
put terminators at the end (220/330 pair works). I have one set up with
11/23 (M8186), MSV11P (dual width 256k), DLV11j (4 serial lines), MRV11B
(Eprom card with TU58 boot).. It has a Tu58 on top. the others have 11/2
and 11/23 (with RQDX3 and 2 MXV11s).
If you want really small, falcon card which is a minimal PDP11. it's
really a complete system T11 cpu, serial, parallel, rom and ram on one
dual card with qbus expansion.
PDT 11/150 is a good classic PDP-11 from the programmers view.
At least one DEC book claims that a PDP11 has to have
either a Unibus or
Qbus expansion bus, and that the PRO3xx and PDT11s are not PDP11s because
of this (for all they run the same instruction srt).
Some DEC books predate their systems... ;) That view is a side effect that
DEC possessed at the time where a PDP-11 really refers to a system and the
CPU is KA11 or some such. Pro3xx is nearly Qbus with different form
factor. PDTs have no accessable bus but they definately are PDP11 if not
by virtue of the same chips use in Q and some Ubus counterparts(LSI11, F11
and J11). So what if the formfactor is a bit different. ;)
Allison
8:15 a.m.
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