2 Jun
2000
2 Jun
'00
5:18 p.m.
Ok, I'm cobbling together a PDP-11 and I ran out of slots on my BA11 so I
put a bus extender into it and plugged that into a BA23. The system works
fine (thank you micronotes!) but I'd like to figure out how I could set it
up so that powering up the 11 powered up both the BA11 and the BA23. Now I
know the little 3 plug do-hickey (I think it is a mate-n-lock) normally
connects to a power sequencer in the rack, but I don't have one of those.
Is there any way to make it work otherwise?
--Chuck
3 Jun
3 Jun
3:32 a.m.
On Fri, 2 Jun 2000, Chuck McManis wrote:
Ok, I'm cobbling together a PDP-11 and I ran out
of slots on my BA11 so I
put a bus extender into it and plugged that into a BA23. The system works
fine (thank you micronotes!) but I'd like to figure out how I could set it
up so that powering up the 11 powered up both the BA11 and the BA23. Now I
know the little 3 plug do-hickey (I think it is a mate-n-lock) normally
connects to a power sequencer in the rack, but I don't have one of those.
Is there any way to make it work otherwise?
Yep... build a power controller. :-)
For info. about power controllers, look through the archives for the
Vmsnet.pdp-11 newsgroup from around November, 1995... not sure if
they're still on deja-news or not, but I found some articles that I
saved from back then containing a thread on power controllers from
when the plug on my 871C melted (BTW, DEC actually sent someone to my
house to check out the burnt plug... they apparently take (or took)
things such as their equipment smouldering rather seriously, even if
it's old and used as a hobby by someone with no service contract).
A word of caution: it's a good idea to check the plugs, that is the
type that are attached to the cable by screws, on power cables every
so often to make sure that the screws are tight and the connection is
good in order to avoid the fragrance of acrid smoke filling your house.
Here's what an 871C looks like, so you have some idea of what one
does; thanks to ARD for corrections and reminding me not to use tabs
in ASCII drawings.
*
purple DPDT switch red
+-----sw1a--+-sw1b-------------------------------------------------+
| | +-----------------------------------------+ |
| orange| c | | |
| D1a | +--------------------------------+ +--C4-+ |
| | c | | | | | |
| - + D2a | | 1 3 1 T1 1| a c | | |
+-C2--------|----+ | R2---? ?--+ +------@!!@----D4--+ | |
| | | | VR1 | | 2@!!@2| | | | green
+-----------|------+ +----?----+--+ | J1-3-@!!@-+------|-----|-|---J2/3-1
| | +-----+6 | a c 2 | | 3@!!@3 a c | | | black
chasis 1 +-|o |---+--D3-----+ | | J1-4-@!!@----D5--+ | | |+J2/3-2
gnd. | | | | | (unused) | | | brown
+--C3---R1+--| RY1 |-------+ | +--|------------------------+ +-|-J2/3-3
| +---| |---+ | | | |
| | +-----+ | +-----|----------------------------+
| J1-1 J1-2--+ |
+--------------------------+-----------+
For the diodes, D1 - D5, a=anode, c=cathode
MOV1 - GE V150LA10A
C1 - 0.1 uF, 270VAC, 1KVDC
C2 - 10 uF, 50VDC (electrolytic)
C3 - .022 uF, 270VAC, 1KVDC
C4 - RVX2247, 50V (.0047uF?)
L1 - numbered as 1S00077, appears to be neon light, with built in resistor
R1 - 1K ohms, 5 percent tol.
R2 - 560 ohms, 5 percent tol.
RY1 - reed relay
VR1 - 8V regulator, National Semiconductor 932 736 08A (possibly 7808 type)
DISCLAIMER: Use the above schematic at your own risk; it's intended as
a rough guideline only, for troubleshooting purposes, for those who
haven't peeked inside theirs to trace the schematic out yet; don't use
this as a reliable guide for repairing or building a power controller!
I can't guarantee that no mistakes were made when tracing it out, and
if you rely upon it, there's no gurantee that it won't destroy you or
your equipment.
--
R. D. Davis
rdd(a)perqlogic.com
http://www.perqlogic.com/rdd
410-744-4900
7:14 a.m.
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2:54 p.m.
On Sat, 3 Jun 2000, Tony Duell wrote:
At one time the DEC power controllers (they're not
really sequencers)
were easy enough to find at radio rallies, etc. They're pretty generic
Of course, one could find inexpensive test equipment (e.g. < $15 for
tektronix 'scopes and HP frequency counters), interesting and
inexpensive computers, etc. at hamfests... it was so much fun before
the people who just want to collect, and not play with, computers
began calling themselves "computer collectors" and started snapping
stuff up quickly and then only letting it go at high prices.
(there are no Unibus or Qbus versions :-)), so
something like an 861 or
an 871 would work fine. Have these units now attracted E-overpay prices?
Thus far, I've not seen any on E-bilk.
--
R. D. Davis
rdd(a)perqlogic.com
http://www.perqlogic.com/rdd
410-744-4900
4 Jun
4 Jun
10:54 a.m.
On my older systems you also needed "loopback" plugs at each end (at least
I have that on my 11/20, where one of the two connectors on the 11/20 has a
plug connecting pins 2 and 3, and at the far end is a plug connecting pins
1 and 2.
I just did a little test. I checked my Microvax, a BA23. It puts 555 ohms
between pins 1 and 3.
Also, if I short pins 1 and 3 on the BA11K holding my 11/34, (or an H720
power supply), it turns it on.
So, maybe you can try anyway -- probably would not hurt to try running the
3 wire cable between the BA23 (my MicroVAX BA23's have nothing in pin 2, by
the way) and the BA11 (top connector).
As an initial test, you could plug your BA11 in, and connect pin 1 to pin 3
and see if it turns it on.
Of course, you would not get the "Ground for Off" automatic shutdown
capability, but it looks like the BA23 wasn't set up for that anyway, at
least on mine.
Jay
At 06:51 PM 6/3/00 +0100, you wrote:
---
Jay R. Jaeger The Computer Collection
cube1(a)home.com visit http://members.home.net/thecomputercollection
Ok, I'm cobbling together a PDP-11 and I ran out of slots on my BA11 so I
put a bus extender into it and plugged that into a BA23. The system works
fine (thank you micronotes!) but I'd like to figure out how I could set it
up so that powering up the 11 powered up both the BA11 and the BA23. Now I
know the little 3 plug do-hickey (I think it is a mate-n-lock) normally
connects to a power sequencer in the rack, but I don't have one of those.
Is there any way to make it work otherwise?
At one time the DEC power controllers (they're not really sequencers)
were easy enough to find at radio rallies, etc. They're pretty generic
(there are no Unibus or Qbus versions :-)), so something like an 861 or
an 871 would work fine. Have these units now attracted E-overpay prices?
The other possibility is to make your own power controller. They're not
that complex. The 3 pins on the connector are :
Ground
Ground-for-off
Ground-for-on
The 'truth table' is :
Ground-for-off Ground-for-on Power controller relay
Floating Floating Off
Floating Grounded On
Grounded Floating Off
Grounded Grounded Off
Oh yes, these signals can be at up to 24V, and the supply is sourced by
the power controller.
Conventionally, in the CPU box, a contact on the power switch, or a
transistor in the PSU, is connected between Ground and Ground-for-on.
Turning on the CPU grounds Ground-for-on and turns on the power
controller relay. This then powers up the rest of the system.
Overheat-protection switches are wired between Ground and Ground-for-off.
If any one of those trips, it turns off every power controller in the system.
A few mounting boxes (the BA11-K is the most common one) have their own
built-in mini-power-controller for just that box. If you string the
3-wire cables between them, set the toggle switch on the back to
'remote' and plug them all into the mains then turning on the CPU will
turn on the other boxes. But most mounting boxes don't work like this :-(
I notice Bob Davis has posted some schematics of a power controller, so I'll
comment further there.
-tony
5 Jun
5 Jun
6:04 a.m.
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6 Jun
6 Jun
5:14 a.m.
On Mon, 5 Jun 2000, Tony Duell wrote:
[1] Although some PDP11/10s seem to use the older
system I'll describe below.
My PDP-11/03 systems were apparently sold as some sort of laboratory
equipment package by a company called Applied Color Systems (ACS);
they were full of some sort of metallic-looking dust (I think they
came from a cosmetics company before being donated to the the
university where I got them, which didn't want the equipment), and
came with a non-DEC power controller: an Applied Color Systems C1035
power controller which is of a rather simple design, although it
contains parts from well-known manufacturers: AMF/Potter & Brumfield
relay, Gould circuit breaker, Tignal Transformer Co. 12VAC transformer
and sockets made to federal spec. WC-596, whatever that is; heavy
solid steel case as well. I wonder if they're "badge engineered."
There are six switched outlets, two unswitched outlets, a 20A circuit
breaker, two 120VAC plastic three-pin (two of which are used)
connectors for fans and one plastic three-pin connector (two of which
are used) that when shorted completes the circuit for the relay coil
and switches the 6 outlets on.
--
R. D. Davis
rdd(a)perqlogic.com
http://www.perqlogic.com/rdd
410-744-4900
8:49 a.m.
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9:02 a.m.
On Mon, 5 Jun 2000, Tony Duell wrote:
ACS was a company that (IIRC) used to make PDP11/03 and 11/23 based
systems for paint color matching (I think). They were based near
Princeton, NJ and their excess stuff often made it to the Trenton
computer festival.
Bill
[1] Although some PDP11/10s seem to use the older
system I'll describe below.
My PDP-11/03 systems were apparently sold as some sort of laboratory
equipment package by a company called Applied Color Systems (ACS);
they were full of some sort of metallic-looking dust (I think they
came from a cosmetics company before being donated to the the
university where I got them, which didn't want the equipment), and
came with a non-DEC power controller: an Applied Color Systems C1035
power controller which is of a rather simple design, although it
contains parts from well-known manufacturers: AMF/Potter & Brumfield
relay, Gould circuit breaker, Tignal Transformer Co. 12VAC transformer
and sockets made to federal spec. WC-596, whatever that is; heavy
solid steel case as well. I wonder if they're "badge engineered."
3 Jun
3 Jun
1:11 p.m.
Hi Chuck,
I have a few extra DEC power controllers, with the outlets and
the 3 plug do-hickey's.
Contact me OL if you want one (or two)...
clint
PS anybody can contact me if they want one... standard 1.2 * shipping
On Fri, 2 Jun 2000, Chuck McManis wrote:
Ok, I'm cobbling together a PDP-11 and I ran out of slots on my BA11 so I
put a bus extender into it and plugged that into a BA23. The system works
fine (thank you micronotes!) but I'd like to figure out how I could set it
up so that powering up the 11 powered up both the BA11 and the BA23. Now I
know the little 3 plug do-hickey (I think it is a mate-n-lock) normally
connects to a power sequencer in the rack, but I don't have one of those.
Is there any way to make it work otherwise?
--Chuck
8927
days inactive
8930
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10 comments
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ard＠p850ug1.demon.co.uk -
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vaxman＠uswest.net