10 May
2015
10 May
'15
7:42 a.m.
The RICM is restoring a PDP-12. This system was manufactured in December of
1972, so it is very late in the life of the PDP-12. The Priority Interrupt
and the Data Multiplexer are hardwired in two extra columns in the
processor chassis. These options were in separate chassis in earlier
models. It came with an Omnibus expansion chassis that connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
The donor did a great job of preserving the machine, and has all of the
original documentation and software. The processor and RK8-F prints are
newer than what I can find on the Web, so I will scan them and send the
PDFs to Bitsavers.
Yesterday we reformed the caps in the power supply and powered it on for
the first time in 24 years. It is going to need some debugging, but it does
show some signs of life.
The CRT in the VR14
--
Michael Thompson
10 May
10 May
7:45 a.m.
Sorry, I sent the message before I was finished.
The CRT in the VR14 has severe screen rot. Hopefully we can find a
replacement CRT, or get some help with removing the outer layer of glass.
One of the lime green switches on the front panel has broken pivots. Anyone
have a spare?
On Sun, May 10, 2015 at 10:42 AM, Michael Thompson <
michael.99.thompson at gmail.com> wrote:
The RICM is restoring a PDP-12. This system was
manufactured in December
of 1972, so it is very late in the life of the PDP-12. The Priority
Interrupt and the Data Multiplexer are hardwired in two extra columns in
the processor chassis. These options were in separate chassis in earlier
models. It came with an Omnibus expansion chassis that connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
The donor did a great job of preserving the machine, and has all of the
original documentation and software. The processor and RK8-F prints are
newer than what I can find on the Web, so I will scan them and send the
PDFs to Bitsavers.
Yesterday we reformed the caps in the power supply and powered it on for
the first time in 24 years. It is going to need some debugging, but it does
show some signs of life.
The CRT in the VR14
--
Michael Thompson
--
Michael Thompson
7:48 a.m.
have u though of just drilling its pivit point out and puting a metal rod
through to pin it?
On Sun, May 10, 2015 at 9:45 AM, Michael Thompson <
michael.99.thompson at gmail.com> wrote:
Sorry, I sent the message before I was finished.
The CRT in the VR14 has severe screen rot. Hopefully we can find a
replacement CRT, or get some help with removing the outer layer of glass.
One of the lime green switches on the front panel has broken pivots. Anyone
have a spare?
On Sun, May 10, 2015 at 10:42 AM, Michael Thompson <
michael.99.thompson at gmail.com> wrote:
The RICM is restoring a PDP-12. This system was
manufactured in December
of 1972, so it is very late in the life of the PDP-12. The Priority
Interrupt and the Data Multiplexer are hardwired in two extra columns in
the processor chassis. These options were in separate chassis in earlier
models. It came with an Omnibus expansion chassis that connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
The donor did a great job of preserving the machine, and has all of the
original documentation and software. The processor and RK8-F prints are
newer than what I can find on the Web, so I will scan them and send the
PDFs to Bitsavers.
Yesterday we reformed the caps in the power supply and powered it on for
the first time in 24 years. It is going to need some debugging, but it
does
show some signs of life.
The CRT in the VR14
--
Michael Thompson
--
Michael Thompson
29 May
29 May
6:20 a.m.
If you haven't yet found one, I have spares for the switch cover - I
have an entire console and the backplanes (with the cards) whose machine
was disassembled out from underneath them.
JRJ
On 5/10/2015 9:45 AM, Michael Thompson wrote:
Sorry, I sent the message before I was finished.
The CRT in the VR14 has severe screen rot. Hopefully we can find a
replacement CRT, or get some help with removing the outer layer of glass.
One of the lime green switches on the front panel has broken pivots. Anyone
have a spare?
On Sun, May 10, 2015 at 10:42 AM, Michael Thompson <
michael.99.thompson at gmail.com> wrote:
The RICM is restoring a PDP-12. This system was
manufactured in December
of 1972, so it is very late in the life of the PDP-12. The Priority
Interrupt and the Data Multiplexer are hardwired in two extra columns in
the processor chassis. These options were in separate chassis in earlier
models. It came with an Omnibus expansion chassis that connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
The donor did a great job of preserving the machine, and has all of the
original documentation and software. The processor and RK8-F prints are
newer than what I can find on the Web, so I will scan them and send the
PDFs to Bitsavers.
Yesterday we reformed the caps in the power supply and powered it on for
the first time in 24 years. It is going to need some debugging, but it does
show some signs of life.
The CRT in the VR14
--
Michael Thompson
10 May
10 May
1:13 p.m.
Sounds great. Did the newer PDP-12s come with a VR14? I thought most came
with a VR12.
I would love to have a LP01 if anyone out there has one they don't need.
Paul
On Sun, May 10, 2015 at 9:42 AM, Michael Thompson <
michael.99.thompson at gmail.com> wrote:
The RICM is restoring a PDP-12. This system was
manufactured in December of
1972, so it is very late in the life of the PDP-12. The Priority Interrupt
and the Data Multiplexer are hardwired in two extra columns in the
processor chassis. These options were in separate chassis in earlier
models. It came with an Omnibus expansion chassis that connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
The donor did a great job of preserving the machine, and has all of the
original documentation and software. The processor and RK8-F prints are
newer than what I can find on the Web, so I will scan them and send the
PDFs to Bitsavers.
Yesterday we reformed the caps in the power supply and powered it on for
the first time in 24 years. It is going to need some debugging, but it does
show some signs of life.
The CRT in the VR14
--
Michael Thompson
1:42 p.m.
On 05/10/2015 04:42 PM, Michael Thompson wrote:
It came with an Omnibus expansion chassis that
connects to the
Posibus from the PDP-12. The LP01, RK05, and PC04 controllers are in the
Omnibus chassis. The VR14 and TU56 controllers are in the processor
chassis. We got the LP01 too.
Sounds like a very nice PDP-12 setup. Does the Omnibus expansion allow
for Omnibus memory as well?
/P
11 May
11 May
8:36 a.m.
On Sun, May 10, 2015 at 2:42 PM, Pontus <pontus at update.uu.se> wrote:
Sounds like a very nice PDP-12 setup. Does the Omnibus
expansion allow for
Omnibus memory as well?
Pretty sure that only IOT's type operations are translated by the posibus
to omnibus converter. I believe this includes single cycle data break
devices. And while Data break allows the I/O devices to talk to the CPU
memory system it is quite different from allowing the CPU to talk to
Omnibus memory.
I have read that there was a device that allowed an 8/I to be interfaced to
Omnibus memory and some machines were sold this way but I have never seen
one.
--
Doug Ingraham
PDP-8 SN 1175
8:57 a.m.
On Mon, May 11, 2015 at 09:36:17AM -0600, Doug Ingraham wrote:
I have read that there was a device that allowed an
8/I to be interfaced to
Omnibus memory and some machines were sold this way but I have never seen
one.
I've sen one :) which is why I wondered. I've also heard of a
straight-8 with omnibus memory.
/P
12 May
12 May
7:55 a.m.
On Mon, May 11, 2015 at 11:17 AM, Kirk B Davis <kirkbdavis at hush.com> wrote:
Pictures?? :-)
I assume you mean for the RI PDP-12.
http://www.ricomputermuseum.org/Home/equipment/dec-pdp-12
--
Doug Ingraham
PDP-8 SN 1175
13 May
13 May
3:27 p.m.
That got me thinking:
"This is the DW8E-PC Omnibus Expansion Chassis.
The boards at the top convert the Posibus signals from the PDP-12 to
Omnibus signals on the backplane.
The Omnibus contains an LE8-FA LP01 controller, RK8-F RK05 controller,
and a PC8-E PC04 paper tape reader/punch controller.
It only supports one data-break controller per Omnibus.
If we add more flip-chips and then we could add an RX8E controller for
the RX02 floppies."
Or, if you *removed* the RK05 controller, could you substitute an RX8E
without modification?
A pdp-12 booting from a floppy disk would be an... interesting site to behold!
Mike
On Wed, May 13, 2015 at 2:55 AM, Doug Ingraham
<dpi at dustyoldcomputers.com> wrote:
On Mon, May 11, 2015 at 11:17 AM, Kirk B Davis
<kirkbdavis at hush.com> wrote:
--
http://www.corestore.org
'No greater love hath a man than he lay down his life for his brother.
Not for millions, not for glory, not for fame.
For one person, in the dark, where no one will ever know or see.'
Pictures?? :-)
I assume you mean for the RI PDP-12.
http://www.ricomputermuseum.org/Home/equipment/dec-pdp-12
--
Doug Ingraham
PDP-8 SN 1175 
4:05 p.m.
From: Mike Ross: Wednesday, May 13, 2015 3:27 PM
"This is the DW8E-PC Omnibus Expansion Chassis.
The boards at the top convert the Posibus signals from the PDP-12 to
Omnibus signals on the backplane.
The Omnibus contains an LE8-FA LP01 controller, RK8-F RK05 controller,
and a PC8-E PC04 paper tape reader/punch controller.
It only supports one data-break controller per Omnibus.
If we add more flip-chips and then we could add an RX8E controller for
the RX02 floppies."
Or, if you *removed* the RK05 controller, could you substitute an RX8E
without modification?
The RX8E isn't a data-break device, and I think it should "just work"
on the pseudo-Omnibus.
Vince
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11 comments
9 participants
participants (9)
-
cube1＠charter.net -
dpi＠dustyoldcomputers.com -
kirkbdavis＠hush.com -
michael.99.thompson＠gmail.com -
pontus＠update.uu.se -
tdk.knight＠gmail.com -
tmfdmike＠gmail.com -
useddec＠gmail.com -
v.slyngstad＠frontier.com