4 Feb
2002
4 Feb
'02
4:51 a.m.
It can not run nicely, as long as there is no UNIX on
it. ;-)
Once they're both running , putting Unix on one of them is the next step
- However, I only have 10Mb disks and 5.25" floppies - what's the best
way to go about this?
What enclosure? BA23 (4? U 19" rackmount box or
bigtower), BA123 (big
deskside box), ...?
It's a 4U rack mount.
4 Feb
4 Feb
6:32 a.m.
On 2002.02.04 19:51 Tim Myers wrote:
Sounds like a BA23. If you get
any usefull hints, please share them with
me. I am also the owner of a BA23 with dead PSU... :-(
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
Once they're both running , putting Unix on one of
them is the next
step - However, I only have 10Mb disks and 5.25" floppies - what's the
best way to go about this?
1. Get a biger disk.
10MB is much to small for 2.11BSD UNIX, what I
would recomend. Also, you should have at least 1MB RAM. The requirements
of 2.09BSD are less, but 10MB disk is AFAIK still not sufficient.
Have a look at http://www.pups.org/
What enclosure?
BA23 (4? U 19" rackmount box or bigtower), BA123 (big
deskside box), ...?
It's a 4U rack mount. 
6:53 a.m.
New subject: 2.xBSD in a BA-23 (was Re: MicroPDP 11/73)
--- Jochen Kunz <jkunz(a)unixag-kl.fh-kl.de> wrote:
1. Get a biger disk. 10MB is much to small for 2.11BSD
UNIX, what I
would recommend.
An option since it's a KDJ11. I have more than one KDF11 which keeps
me stuck at 2.9BSD.
Also, you should have at least 1MB RAM. The
requirements
of 2.09BSD are less, but 10MB disk is AFAIK still not sufficient.
Have a look at http://www.pups.org/
I have loaded 2.9BSD on a real 11/24 w/RL02 disks. One 10Mb platter
was enough for a basic bin installation. If you wanted source (so
you could rebuild a kernel with only your devices in it to save memory
for your processes), 10Mb is not enough; 20Mb is not enough. If you can
locate an ST251 (40Mb) and the Field Service formatter, you can turn
it into an RD33... not the fastest drive for the box, but it is somewhat
widely available for an MFM drive.
I'd have to agree on the RAM. 1Mb is ok for 2.9BSD (I think the minimum
is 256KB, but I'm not positive), but if I were going to run 2.11, I'd want
more.
Sounds like a BA23. If you get any usefull hints,
please share them with
me. I am also the owner of a BA23 with dead PSU... :-(
Is the PSU really dead or did the harness fry? Take off the steel cover
that's over the drive area. Next, look for an odd-shaped aluminum cover
that sits on the front of the PSU and ducts air around it. It should
have two screws, perhaps four. Look under there and you'll see where the
PSU passes power to the backplane. If you have a harness with two white
connectors and wires that are parallel to the pins, congratulations; it's
a replacement harness. If the connectors are amber with the wires
perpendicular to the power pins, it's an older connector that will
eventually fail. If you remove it and find blackened plastic/metal,
do not use it. The resistance will cause heating which will cause more
oxidation which will increase the resistance, etc.
15 years ago, these things were known to catch fire occasionally.
-ethan
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8:23 a.m.
New subject: 2.xBSD in a BA-23 (was Re: MicroPDP 11/73)
On 2002.02.04 21:53 Ethan Dicks wrote:
If you can
locate an ST251 (40Mb) and the Field Service formatter, you can turn
it into an RD33... not the fastest drive for the box, but it is
somewhat widely available for an MFM drive.
I have a VAXstation 2000...
XXDP is at ftp://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/xxdp
Is the PSU really dead or did the harness fry?
The PSU is dead. I know about the fire catching wires and they where not
the problem. I inspected the PSU and I get the usual 300VDC input at the
actual PSU PCB, but the PSU does not start. As SM-PSUs are black magic
for me, I gave it to a co-worker that is familar with this kind of
magic. If he can repair it and he can get a KA640 based VAX for me I
will give him one of my two 11/73 CPU, RAM, disk, ... so he can build
his own PDP 11 and I don't have to bother with that SM-PSU magic. :-)
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
11:42 a.m.
New subject: 2.xBSD in a BA-23 (was Re: MicroPDP 11/73)
--- Jochen Kunz <jkunz(a)unixag-kl.fh-kl.de> wrote:
Well... SM-PSUs are magic to me, too. Good luck on the PSU repair...
-ethan
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On 2002.02.04 21:53 Ethan Dicks wrote:
There you go... the ST-251 requires no jumpers or funny stuff (except
for getting the drive select jumpers correct). The ROM formatter in
a VS2000 will format the drive suitably for an RQDX3.
Thanks. I need to go get a copy... I've mostly been formatting disks
in a BA-23 with a uVAX-II processor - takes forever to boot the TK50.
I'd love to be able to bring up a floppy-based formatter under any
processor. I have several quad-height KDF11 boards (just add RAM
and a disk controller) and one quad-height KDJ11 board formerly in
a communication board, now with new ROMs. All I have to do is drill
off the new-style handle and put an old one on so it fits in the boxes
I have (my newest Qbus box is a BA-123; got no BA-213s and the like)
If you can
locate an ST251 (40Mb) and the Field Service formatter, you can turn
it into an RD33... not the fastest drive for the box, but it is
somewhat widely available for an MFM drive.
I have a VAXstation 2000... Is the PSU
really dead or did the harness fry?
The PSU is dead. I know about the fire
catching wires and they where not
the problem.
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4 comments
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participants (3)
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erd_6502＠yahoo.com -
jkunz＠unixag-kl.fh-kl.de -
tim.myers＠protasis.co.uk