22 Mar
2005
22 Mar
'05
5:09 p.m.
I'd like to include a PDP in my collection, but not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
Cheers
Ian.
__________________________________
Do you Yahoo!?
Yahoo! Small Business - Try our new resources site!
http://smallbusiness.yahoo.com/resources/
22 Mar
22 Mar
5:15 p.m.
On Tue, 22 Mar 2005, silvercreekvalley wrote:
I'd like to include a PDP in my collection, but
not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
PDP 11/03
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
7:10 p.m.
11/03 ? forget it . no mmu - won't run real (v6,7) unix..
a 34 might be a better bet. Wasn't the 35 small-packaged 40/45?
heinz
Selllam wrote:
> Re: Which PDP?
>
On Tue, 22 Mar 2005, silvercreekvalley wrote:
I'd like to include a PDP in my collection,
but not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
PDP 11/03 
7:24 p.m.
11/03 ? forget it . no mmu - won't run real (v6,7)
unix..
a 34 might be a better bet. Wasn't the 35 small-packaged 40/45?
heinz
The 11/35 is the same CPU as the 11/40, and it did come in
a 10 1/2" chassis as an option, but the CPU card set is
*quite difficult* to find spares for. The standard 10 1/2"
chassis isn't set up to hold a lot. I have one that is sickly
and it has a CPU backplane, an early 9-slot core memory backplane,
and a 4-slot core memory backplane. Even if you tried to replace
the core memory backplanes with a standard unibus backplane such
as the DD11-DK so you could use more modern MOS memory and add
an RL02 controller or something like that, you could not plug
the backplane into the power supply without reworking the
power supply connectors.
The old blinking lights PDP-11s are not easy to come by, and
if you do find one you will likely have to pay lots of $$$$
for it.
I think an 11/34 is a better choice if you want a 70s model
PDP-11 to start out with. I actually have a spare 11/34A
that I might be interested in selling once I fix what I
believe is a power supply problem. Spares for the 11/34
are also fairly obtainable.
Ashley
5:23 p.m.
You should also consider if you want a Unibus system (even numbered) or
a Qbus system (odd numbered) or a hybrid like an 11/83.. though thats an
80's system, hmmmmm....
Curt
silvercreekvalley wrote:
I'd like to include a PDP in my collection, but
not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
Cheers
Ian.
__________________________________
Do you Yahoo!?
Yahoo! Small Business - Try our new resources site!
http://smallbusiness.yahoo.com/resources/
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.8.0 - Release Date: 3/21/2005
5:32 p.m.
Curt wrote:
You should also consider if you want a Unibus system
(even numbered) or
a Qbus system (odd numbered) or a hybrid like an 11/83.. though thats an
80's system, hmmmmm....
The 11/83 is a Qbus system. There aren't any "hybrid" systems.
You were perhaps thinking of the 11/84 and 11/94 Unibus systems, which use
the same CPU modules as the 11/83 and 11/93 Qbus systems. But when those
modules are used in the 11/84 and 11/94 backplane, there is *NOT* a Qbus
present. There is a somewhat-Qbus-like bus, but it is not compatible with
Qbus either electrically or in terms of bus protocol.
Anyhow, none of those meet the "70's design" criteria Ian specified.
Eric
8:10 p.m.
Eric,
Thanks for the clarification, my mistake, I thought my old 11/84 was
Uni and Qbus CPU/Bridge in the same system, so I thought it meant it was
a dual bus system outside of the Qbus cards in it.
Curt
Eric Smith wrote:
Curt wrote:
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.8.0 - Release Date: 3/21/2005
You should also consider if you want a Unibus
system (even numbered) or
a Qbus system (odd numbered) or a hybrid like an 11/83.. though thats an
80's system, hmmmmm....
The 11/83 is a Qbus system. There aren't any "hybrid" systems.
You were perhaps thinking of the 11/84 and 11/94 Unibus systems, which use
the same CPU modules as the 11/83 and 11/93 Qbus systems. But when those
modules are used in the 11/84 and 11/94 backplane, there is *NOT* a Qbus
present. There is a somewhat-Qbus-like bus, but it is not compatible with
Qbus either electrically or in terms of bus protocol.
Anyhow, none of those meet the "70's design" criteria Ian specified.
Eric
5:37 p.m.
From: "Curt @ Atari Museum" <curt at atarimuseum.com>
You should also consider if you want a Unibus system
(even numbered) or
a Qbus system (odd numbered) or a hybrid like an 11/83.. though thats an
80's system, hmmmmm....
Curt
the /45 and /55 are Unibus machines............
You could try a PDP 11/34, or do you want the classic "lights and switches"
front panel?
Jim.
23 Mar
23 Mar
9:41 a.m.
>>>> "curt" == curt <@ Atari
Museum" <curt at atarimuseum.com>> writes:
curt> You should also consider if you want a Unibus system (even
curt> numbered) or a Qbus system (odd numbered) ..
Huh? You can't deduce the bus type from the parity of the model
number.
11/03, 23, 73, 83 are Qbus
11/04, 05, 10, 15, 20, 35, 40, 45, 55, 60, 70, 74, 84 are Unibus
paul
11:57 a.m.
On Tue, 22 Mar 2005, Curt @ Atari Museum wrote:
You should also consider if you want a Unibus system
(even numbered) or
a Qbus system (odd numbered) or a hybrid like an 11/83.. though thats an
80's system, hmmmmm....
The even/odd numbering is only valid for the later
systems. Also,
an 11/83 is not a hybrid, its a QBus CPU, and system. You meant
to say 11/84, which has the same CPU, and a Unibus bridge board.
--f
3:07 p.m.
Fred wrote:
The even/odd numbering is only valid for the later
systems.
It's perfectly simple. If you're not getting your hair cut, you don't have
to move your brother's clothes down to the lower peg. You simply collect
his note before lunch, after you've done your scripture prep, when you've
written your letter home, before rest, move your own clothes onto the lower
peg, greet the visitors, and report to Mr. Viney that you've had your chit
signed.
Oops, strike that. I meant: It's perfectly simple. The models
that end in "3" are Qbus.
Also, an 11/83 is not a hybrid, its a QBus CPU, and
system. You meant
to say 11/84, which has the same CPU, and a Unibus bridge board.
Note that while the KDJ11-B CPU is used in both Qbus (11/83) and Unibus
(11/84) systems, that when installed in an 11/84, it does NOT use Qbus.
The processor bus in an 11/84 is similar but NOT identical to Qbus.
There is a signal on the PMI connector that tells the KDB11-B which
type of system it is installed into, and thus which kind of bus to use.
Thus the KTJ11-B bridge is NOT a Qbus-to-Unibus bridge, but rather a
KDJ11-B-special-bus-to-Unibus bridge.
Eric
22 Mar
22 Mar
5:28 p.m.
Ian
I'd like to include a PDP in my collection, but
not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
The PDP-11/34 is a fairly compact 1970s design and can run 7th Edition
Unix.
"budget is not huge" is the sticking point. If you get lucky, maybe
you'll find someone giving away a suitable system. If you have to buy
it piece by piece, (CPU, memory, disk controller, disk drive), it
most likely will cost far more than $1000.
Eric
5:45 p.m.
"budget is not huge" is the sticking point.
If you get lucky, maybe
you'll find someone giving away a suitable system. If you have to buy
it piece by piece, (CPU, memory, disk controller, disk drive), it
most likely will cost far more than $1000.
It's doable, I think. An 11/34A CPU box with cards, power supply, some
cables, programmer's front panel, untested, just went on eBay for $203
a few minutes ago.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7501604120
Assuming it turns out to be reasonably working, you'd need additional
cables (I'm guessing, but seems a good bet), and disk drives.
De
6:44 p.m.
silvercreekvalley wrote:
I'd like to include a PDP in my collection, but
not
sure what to go for? My requirements would be
1) It has to be a 70's design
2) It needs to be reasonably compact
3) I'd like to run something 'unix like'
with a c compiler as an option.
4) My budget is not huge <$1000
Any recommendations?
Jerome Fine replies:
If I am not mistaken, the PDP-11/23 might have been
released just before 1980. It would have arrived in
cabinet containing 2 RL02 drives. If the PDP-11/23
arrived a bit later, then the PDP-11/03 would likely
qualify instead.
Most likely, you can find someone who is running out
of space and wants to discard their RL02 drives and
cabinet if you are patient.
The question is how you are going to use the system
and why 1979 is a cutoff? If you can allow models
into the mid 1980s, then a much smaller PDP-11/73 in a
BA23 box using 5 1/4" hard drives or even SCSI drives
(although a Qbus host adapter is usually still expensive).
What are you reasons for the 1979 cutoff and how will
you use the PDP-11? You will probably need a VT100
as the terminal, although that may also not qualify
in which case a VT52 would be OK.
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
7056
days inactive
7057
days old
14 comments
11 participants
participants (11)
-
curt＠atarimuseum.com -
drb＠msu.edu -
eric＠brouhaha.com -
h.wolter＠sympatico.ca -
jhfinexgs2＠compsys.to -
jim＠g1jbg.co.uk -
pkoning＠equallogic.com -
silvercreekvalley＠yahoo.com -
vcf＠siconic.com -
wacarder＠usit.net -
waltje＠pdp11.nl