12 Oct
2024
12 Oct
'24
11:51 a.m.
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
One approach would be to use a 50Hz/400Hz power converter. There are ones on the market
creating almost pure sinus output with minimal harmonics.
Another approach would be to substitute the old psu by modern ones, possibly by DC-DC
converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did
this in the past?
Best
Andreas
12 Oct
12 Oct
12:24 p.m.
Would a motor generator be less expensive?
On Oct 12, 2024, at 7:51 AM, hupfadekroua via cctalk
<cctalk(a)classiccmp.org> wrote:
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
One approach would be to use a 50Hz/400Hz power converter. There are ones on the market
creating almost pure sinus output with minimal harmonics.
Another approach would be to substitute the old psu by modern ones, possibly by DC-DC
converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did
this in the past?
Best
Andreas
5:28 p.m.
On Sat, 2024-10-12 at 08:24 -0400, Michael Thompson via cctalk wrote:
Would a motor generator be less expensive?
AC-DC-AC high-voltage long-distance transmission lines such as the
Pacific Intertie originally used motor generators, then thyratrons, now
all semiconductors.
> On Oct 12, 2024, at 7:51 AM, hupfadekroua via
cctalk
> <cctalk(a)classiccmp.org> wrote:
>
> Hi all,
>
> after approx 30 years of waiting our time has come to get hands on
> a Cyber 180/860a.
>
> These systems as other systems before are using 400Hz psus.
>
> One approach would be to use a 50Hz/400Hz power converter. There
> are ones on the market creating almost pure sinus output with
> minimal harmonics.
>
> Another approach would be to substitute the old psu by modern ones,
> possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the
> multiple KW range or did this in the past?
>
> Best
>
> Andreas
7:30 p.m.
Years ago I commented (on this list, probably) that a "VFC" would likely make a
good 400 Hz supply. VFC is "Variable frequency controller", a device that takes
mains input and turns it into three phase output of a frequency of your choice. The upper
frequency is typically fairly low; I don't think mine reaches 400 Hz but then again it
cost me less than $100 for a unit that can drive a 3 hp motor. That one takes either
single or three phase (220 volt) input; larger ones are normally specified as 3 phase only
though chances are they would in fact work if you fed them single phase power.
I'd expect them to be a whole lot cheaper than motor-generator sets, and also far more
available and reliable.
paul
On Oct 12, 2024, at 8:24 AM, Michael Thompson via
cctalk <cctalk(a)classiccmp.org> wrote:
Would a motor generator be less expensive?
> On Oct 12, 2024, at 7:51 AM, hupfadekroua via cctalk <cctalk(a)classiccmp.org>
wrote:
>
> Hi all,
>
> after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
>
> These systems as other systems before are using 400Hz psus.
>
> One approach would be to use a 50Hz/400Hz power converter. There are ones on the
market creating almost pure sinus output with minimal harmonics.
>
> Another approach would be to substitute the old psu by modern ones, possibly by DC-DC
converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
>
> Best
>
> Andreas
8:54 p.m.
On 10/12/24 14:30, Paul Koning via cctalk wrote:
Years ago I commented (on this list, probably) that a
"VFC" would likely make a good 400 Hz supply. VFC is "Variable frequency
controller", a device that takes mains input and turns it into three phase output of
a frequency of your choice. The upper frequency is typically fairly low; I don't
think mine reaches 400 Hz but then again it cost me less than $100 for a unit that can
drive a 3 hp motor. That one takes either single or three phase (220 volt) input; larger
ones are normally specified as 3 phase only though chances are they would in fact work if
you fed them single phase power.
VFDs use IGBTs to create variable width square waves of
about 400 V. These can be turned into appropriate waveforms
with a filter, but you sure don't want to feed these
directly into any kind of computer power supply directly.
Jon
8:58 p.m.
On Oct 12, 2024, at 4:54 PM, Jon Elson via cctalk
<cctalk(a)classiccmp.org> wrote:
On 10/12/24 14:30, Paul Koning via cctalk wrote:
Yes, I've heard that. But why? Power supplies of that era start with a transformer,
which acts as a low pass filter, and after the rectifier there's another filter. Sure
you can turn the PWM waveform into sines, but I can't see that it matters much.
paul
Years ago I commented (on this list, probably)
that a "VFC" would likely make a good 400 Hz supply. VFC is "Variable
frequency controller", a device that takes mains input and turns it into three phase
output of a frequency of your choice. The upper frequency is typically fairly low; I
don't think mine reaches 400 Hz but then again it cost me less than $100 for a unit
that can drive a 3 hp motor. That one takes either single or three phase (220 volt)
input; larger ones are normally specified as 3 phase only though chances are they would in
fact work if you fed them single phase power.
VFDs use IGBTs to create variable width square waves of about 400 V. These can be turned
into appropriate waveforms with a filter, but you sure don't want to feed these
directly into any kind of computer power supply directly.
Jon
3:23 p.m.
On 10/12/24 09:47, Chuck Guzis via cctalk wrote:
On 10/12/24 04:51, hupfadekroua via cctalk wrote:
The IBM 370/145 had a motor/generator set with a 20 Hp 60Hz
motor and a 17 KVA 400 Hz 120/208 3-phase alternator. This
was massive overkill for the 2.5 KW model 145, so I assume
they used the same MG unit for the 370/158 model.
Good luck finding one of those now!
As for the sensibility of going this way, be sure you have
vast amounts of power available to start such an MG unit.
The phase current in that MG was around 60 A no matter the
load (phase angle changes with load), and the starting surge
was WAY worse.
Jon
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
ISTR that 400Hz 3-phase is required.
4:37 p.m.
On 10/12/24 08:23, Jon Elson via cctalk wrote:
On 10/12/24 09:47, Chuck Guzis via cctalk wrote:
Still to be found in the aviation business as ground units. E.g.
https://acim.nidec.com/en-us/generators/leroy-somer/products/industrial/400…
On 10/12/24 04:51, hupfadekroua via cctalk
wrote:
The IBM 370/145 had a motor/generator set with a 20 Hp 60Hz motor and a
17 KVA 400 Hz 120/208 3-phase alternator. This was massive overkill for
the 2.5 KW model 145, so I assume they used the same MG unit for the
370/158 model.
Good luck finding one of those now! Hi all,
after approx 30 years of waiting our time has come to get hands on a
Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
ISTR that 400Hz
3-phase is required.
5:45 p.m.
The system is based in a minimal configuration of the following racks using a own psu per
unit.
CPU
Interconnect
Memory
IOU
to be extended by a second CPU rack for a dual processor configuration.
If the interconnect rack does have an own psu we don‘t know now, since this unit has to be
picked up next.
Peripheral external device controllers have to be assessed separately. These will be part
of a future pickup.
Even the CC545 Console will be a challenge.
Luckily we saved one before being shipped via the SAP collection to CHM.
The next upcoming tasks will be a detailed inspection of the system as well as to dig into
the documentation.
Luckily some docs are on bitsavers, e.g. the site prep guides and we are awaiting paper
based docs or will have access.
We are able to provide 73KW 3 Phase 50Hz electrical power as of today.
The real power consumption has to be assessed based on the documentation.
To use a modern digital controlled frequency converter will have the advantage to limit
the power surge during startup.
Andreas
Am 12.10.2024 um 18:24 schrieb Jon Elson via cctalk
<cctalk(a)classiccmp.org>rg>:
On 10/12/24 09:47, Chuck Guzis via cctalk wrote:
The IBM 370/145 had a motor/generator set with a 20 Hp 60Hz motor and a 17 KVA
400 Hz 120/208 3-phase alternator. This was massive overkill for the 2.5 KW model 145, so
I assume they used the same MG unit for the 370/158 model.
Good luck finding one of those now!
As for the sensibility of going this way, be sure you have vast amounts of power
available to start such an MG unit. The phase current in that MG was around 60 A no
matter the load (phase angle changes with load), and the starting surge was WAY worse.
Jon
On
10/12/24 04:51, hupfadekroua via cctalk wrote:
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
ISTR that 400Hz
3-phase is required.
5:32 p.m.
On Sat, 2024-10-12 at 14:47 +0000, Chuck Guzis via cctalk wrote:
On 10/12/24 04:51, hupfadekroua via cctalk wrote:
Univac 1108 had a cabinet called CTMC that was full of serial ports. It
needed 400 Hz (but the rest of the system ran on 60 Hz power).
Hi all,
after approx 30 years of waiting our time has come to get hands on
a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
ISTR that 400Hz 3-phase is required.
3:18 p.m.
On 10/12/24 06:51, hupfadekroua via cctalk wrote:
Hi all,
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
One approach would be to use a 50Hz/400Hz power converter. There are ones on the market
creating almost pure sinus output with minimal harmonics.
Another approach would be to substitute the old psu by modern ones, possibly by DC-DC
converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did
this in the past?
What level of power does this machine use? What are the DC
voltages to the logic? How many different voltages are
required? Does the system use multiple small AC/DC
converters, or just one huge DC supply for all the logic
using that voltage?
Jon
5:25 p.m.
On Sat, 2024-10-12 at 14:51 +0300, hupfadekroua via cctalk wrote:
Hi all,
after approx 30 years of waiting our time has come to get hands on a
Cyber 180/860a.
These systems as other systems before are using 400Hz psus.
One approach would be to use a 50Hz/400Hz power converter. There are
ones on the market creating almost pure sinus output with minimal
harmonics.
Another approach would be to substitute the old psu by modern ones,
possibly by DC-DC converters or switching powersupplies.
Does someone have experience in the substitution of psus in the
multiple KW range or did this in the past?
Computer History Museum in Mountain View, CA bought an IBM 1401 from
Germany, and needed 50 Hz power for it. Contact Rob Garner
<robgarn(a)mac.com>om>. They have a second one from Connecticut. The cool
address (for their collection) is 1401 Shoreline Boulevard.
John Zabolitsky <jgz(a)cm-muenchen.de> has a collection in Neubiberg on
the southeast edge of Munich. He has some Cyber machines. I don't know
whether he has a 180, and I don't know which ones are operating. He has
a VAX that's being used routinely.
Best
Andreas
6:54 p.m.
On 2024Oct 12,, at 4:51 AM, hupfadekroua via cctalk <cctalk(a)classiccmp.org> wrote:
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
...
Another approach would be to substitute the old psu by
modern ones, possibly by DC-DC converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did
this in the past?
If I recall, the late LCM did this (swapped out the original supply modules and put in
modern switching supplies) for one of their large machines. (Again, IIRC) there were
pictures on the website of the new supplies installed in the cabinets.
I kinda think it was the CDC 6500, but was perhaps one of the DEC
<something>-10's.
Of course, you can’t just contact contact the LCM anymore.
Was it Rich Alderson from, or formerly, on the list who used to work at LCM?
7:47 p.m.
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
.
> Another approach would be to substitute the old
psu by modern ones, possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
I recall that one of the benefits of using an MG set (probably better
referred to as a rotary converter, or motor-alternator set) is the
ability to float though short term power glitches.
I remember summer employment at a drive-in movie theater during my
summers working as a projectionist. Power supply for the DC carbon arc
lamps was supplied by a 40 Hp MG set located in its own building. Such
things do generate a fair amount of noise.
Does this date me?
--Chuck
8:22 p.m.
On Sat, 2024-10-12 at 19:47 +0000, Chuck Guzis via cctalk wrote:
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
.
Like Felix Unger in The Odd Couple, did you wear your seat belt in the
drive-in theater?
> Another approach would be to substitute the
old psu by modern
> ones, possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the
> multiple KW range or did this in the past?
I recall that one of the benefits of using an MG set (probably better
referred to as a rotary converter, or motor-alternator set) is the
ability to float though short term power glitches.
I remember summer employment at a drive-in movie theater during my
summers working as a projectionist. Power supply for the DC carbon
arc
lamps was supplied by a 40 Hp MG set located in its own building.
Such
things do generate a fair amount of noise.
Does this date me?
--Chuck
12 Oct
12 Oct
8:41 p.m.
On 2024-10-12 1:47 p.m., Chuck Guzis via cctalk wrote:
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
I remember summer employment at a drive-in movie
theater during my
summers working as a projectionist. Power supply for the DC carbon arc
lamps was supplied by a 40 Hp MG set located in its own building. Such
things do generate a fair amount of noise.
Does this date me?
Only if you have the 3D glasses. :)
--Chuck
8:44 p.m.
On Oct 12, 2024, at 3:47 PM, Chuck Guzis via cctalk
<cctalk(a)classiccmp.org> wrote:
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
.
Yes, that is true. If you can find an MG set for an affordable price it's a nice
solution, though it does come with the maintenance and reliability considerations of any
mechanical device.
paul
> Another approach would be to substitute the
old psu by modern ones, possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
I recall that one of the benefits of using an MG set (probably better
referred to as a rotary converter, or motor-alternator set) is the
ability to float though short term power glitches. 
9:03 p.m.
Hmm, I think the 40 years has expired, so I can tell the story of the MG
at NATO HQ... It had a two-ton flywheel, and a standby generator off a
side shaft that kicked in if commercial AC failed. Problem was, the
building was wired with incorrect phase colouring, so when they
installed it all the motors went backwards! U-Thant got in an elevator
for an upper floor and went down and hit the stops!
On 2024-10-12 15:47, Chuck Guzis via cctalk wrote:
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
.
--
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
> Another approach would be to substitute the
old psu by modern ones, possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
I recall that one of the benefits of using an MG set (probably better
referred to as a rotary converter, or motor-alternator set) is the
ability to float though short term power glitches.
I remember summer employment at a drive-in movie theater during my
summers working as a projectionist. Power supply for the DC carbon arc
lamps was supplied by a 40 Hp MG set located in its own building. Such
things do generate a fair amount of noise.
Does this date me?
--Chuck
9:25 p.m.
Didn’t all the IBM mainframes use 400hz? Maybe ask the IBMers how they got 400hz.
Also, can the local power company supply it?
Sent from my iPhone
On Oct 12, 2024, at 14:03, Nigel Johnson Ham via
cctalk <cctalk(a)classiccmp.org> wrote:
Hmm, I think the 40 years has expired, so I can tell the story of the MG at NATO HQ...
It had a two-ton flywheel, and a standby generator off a side shaft that kicked in if
commercial AC failed. Problem was, the building was wired with incorrect phase colouring,
so when they installed it all the motors went backwards! U-Thant got in an elevator for
an upper floor and went down and hit the stops!
On 2024-10-12 15:47, Chuck Guzis via cctalk
wrote:
On 10/12/24 11:54, Brent Hilpert via cctalk wrote:
.
--
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
> Another approach would be to substitute the
old psu by modern ones, possibly by DC-DC converters or switching powersupplies.
>
> Does someone have experience in the substitution of psus in the multiple KW range or
did this in the past?
I recall that one of the benefits of using an MG set (probably better
referred to as a rotary converter, or motor-alternator set) is the
ability to float though short term power glitches.
I remember summer employment at a drive-in movie theater during my
summers working as a projectionist. Power supply for the DC carbon arc
lamps was supplied by a 40 Hp MG set located in its own building. Such
things do generate a fair amount of noise.
Does this date me?
--Chuck
13 Oct
13 Oct
1:07 a.m.
On 10/12/24 16:25, Wayne S via cctalk wrote:
Didn’t all the IBM mainframes use 400hz? Maybe ask the
IBMers how they got 400hz.
Also, can the local power company supply it?
The IBM 370/145 definitely used 400 Hz internally, there was
a 60 Hz 3-phase to 400 Hz 3-phase motor-alternator in the
back of the power cabinet.
I know that larger installations had massive 400 Hz UPS's
that also did the conversion from 60 Hz to 400 Hz.
I can't imagine any local power utility would want to supply
400 Hz power.
Jon
1:40 a.m.
On 10/12/24 20:07, Jon Elson via cctalk wrote:
On 10/12/24 16:25, Wayne S via cctalk wrote:
> Didn’t all the IBM mainframes use 400hz? Maybe ask the
> IBMers how they got 400hz.
> Also, can the local power company supply it?
>
Oh, the IBM 7090 series had a 400 Hz motor generator. The
mid-range IBM 360's (360/50 and 360/65) has
"converter-inverters". There was a star rectifier that took
in 208 V 3-phase and converted it to DC with an
inductor-input filter at about 300 V DC. This was then fed
to an inductor-input resonant inverter with fast SCRs at 2.5
KHz. All the power supplies for logic, memory, etc. ran off
120 V single-phase 2.5 KHz power. This kept the
transformers and filter caps and inductors very small. The
inverter SCRs were commutated by two smaller SCRs that
momentarily shorted the main SCRs through oil-paper caps.
The problem with this system is it didn't offer much
ride-through capability if you had crummy power quality.
Jon
3:26 a.m.
On 2024-10-12 7:40 p.m., Jon Elson via cctalk wrote:
On 10/12/24 20:07, Jon Elson via cctalk wrote:
What did they use for air conditioning?
On 10/12/24 16:25, Wayne S via cctalk wrote:
> Didn’t all the IBM mainframes use 400hz? Maybe ask the IBMers how
> they got 400hz.
> Also, can the local power company supply it?
>
Oh, the IBM 7090 series had a 400 Hz motor generator. The mid-range IBM
360's (360/50 and 360/65) has "converter-inverters". There was a star
rectifier that took in 208 V 3-phase and converted it to DC with an
inductor-input filter at about 300 V DC. This was then fed to an
inductor-input resonant inverter with fast SCRs at 2.5 KHz. All the
power supplies for logic, memory, etc. ran off 120 V single-phase 2.5
KHz power. This kept the transformers and filter caps and inductors
very small. The inverter SCRs were commutated by two smaller SCRs that
momentarily shorted the main SCRs through oil-paper caps.
The problem with this system is it didn't offer much ride-through
capability if you had crummy power quality.
Jon
8:29 a.m.
Water cooled
Am 13.10.2024 um 11:15 schrieb ben via cctalk
<cctalk(a)classiccmp.org>rg>:
On 2024-10-12 7:40 p.m., Jon Elson via cctalk wrote:
What did they use for air conditioning?
On
10/12/24 20:07, Jon Elson via cctalk wrote:
On 10/12/24 16:25, Wayne S via cctalk wrote:
> Didn’t all the IBM mainframes use 400hz? Maybe ask the IBMers how they got 400hz.
> Also, can the local power company supply it?
>
Oh, the IBM 7090 series had a 400 Hz motor generator. The mid-range IBM
360's (360/50 and 360/65) has "converter-inverters". There was a star
rectifier that took in 208 V 3-phase and converted it to DC with an inductor-input filter
at about 300 V DC. This was then fed to an inductor-input resonant inverter with fast
SCRs at 2.5 KHz. All the power supplies for logic, memory, etc. ran off 120 V
single-phase 2.5 KHz power. This kept the transformers and filter caps and inductors very
small. The inverter SCRs were commutated by two smaller SCRs that momentarily shorted the
main SCRs through oil-paper caps.
The problem with this system is it didn't offer much ride-through capability if you
had crummy power quality.
Jon
3:05 p.m.
On 10/12/24 22:26, ben via cctalk wrote:
On 2024-10-12 7:40 p.m., Jon Elson via cctalk wrote:
All 360's except the model /85 were air-cooled. The model
/85 was water cooled, and was essentially a prototype of the
370/165.
I can't answer for all installations, but our old computer
center had a huge AC unit in the basement that blew cooled
air under the raised floor.
Jon
On 10/12/24 20:07, Jon Elson via cctalk wrote:
What did they use for air conditioning? On 10/12/24 16:25, Wayne S via cctalk wrote:
> Didn’t all the IBM mainframes use 400hz? Maybe ask the
> IBMers how they got 400hz.
> Also, can the local power company supply it?
>
Oh, the IBM 7090 series had a 400 Hz motor generator.
The mid-range IBM 360's (360/50 and 360/65) has
"converter-inverters". There was a star rectifier that
took in 208 V 3-phase and converted it to DC with an
inductor-input filter at about 300 V DC. This was then
fed to an inductor-input resonant inverter with fast SCRs
at 2.5 KHz. All the power supplies for logic, memory,
etc. ran off 120 V single-phase 2.5 KHz power. This kept
the transformers and filter caps and inductors very
small. The inverter SCRs were commutated by two smaller
SCRs that momentarily shorted the main SCRs through
oil-paper caps.
The problem with this system is it didn't offer much
ride-through capability if you had crummy power quality.
Jon
6:32 a.m.
They substituted the original psus of their ki10
Am 12.10.2024 um 23:50 schrieb Brent Hilpert via
cctalk <cctalk(a)classiccmp.org>rg>:
On 2024Oct 12,, at 4:51 AM, hupfadekroua via cctalk <cctalk(a)classiccmp.org>
wrote:
after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a.
...
Another approach would be to substitute the old
psu by modern ones, possibly by DC-DC converters or switching powersupplies.
Does someone have experience in the substitution of psus in the multiple KW range or did
this in the past?
If I recall, the late LCM did this (swapped out the original supply modules and put in
modern switching supplies) for one of their large machines. (Again, IIRC) there were
pictures on the website of the new supplies installed in the cabinets.
I kinda think it was the CDC 6500, but was perhaps one of the DEC
<something>-10's.
Of course, you can’t just contact contact the LCM anymore.
Was it Rich Alderson from, or formerly, on the list who used to work at LCM?
18 Oct
18 Oct
10:47 p.m.
New subject: LCM+L power supply shenanigans [was Re: Re: CDC Cyber 180/8xx PSU]
Date: Sat, 12 Oct 2024 11:54:48 -0700
From: Brent Hilpert
On 2024Oct 12,, at 4:51 AM, hupfadekroua via cctalk
<cctalk(a)classiccmp.org> wrote:
after approx
30 years of waiting our time has come to get hands on a Cyber 180/860a.
... > Another approach would be to substitute the old
psu by modern ones, possibly
> by DC-DC converters or switching powersupplies.
> Does someone have experience in the substitution
of psus in the multiple KW
> range or did this in the past?
Yes, we did.
If I recall, the late LCM did this (swapped out the
original supply modules
and put in modern switching supplies) for one of their large machines.
(Again, IIRC) there were pictures on the website of the new supplies
installed in the cabinets.
I kinda think it was the CDC 6500, but was perhaps one
of the DEC <something>-10's.
Nope, not the 6500.
We replaced power supplies on a KL-10 in the blue 6ft cabinets (a
DECsystem-1080) which was never on the 2nd floor, the PDP-7 from the University
of Oregon Nuclear Physics lab, and the KI-10 from Kiel.
We rebuilt others. I personally rebuilt the Might Mite in the MIT-AI KS-10
(OMG, sysadmin with a screwdriver and high-V!). We rebuilt the big arse linear
and all the smaller DEC power units in the orange 5ft KL-10 (a DECSYSTEM-2065)
on which we ran Tops-10, because we had XKL Toad-1 and TOAD-2 systems for TOPS-20.
And on the 6500, we used a commercial semiconductor based converter which took
in 60VAC and output 400VAC, because that was the least expensive thing we could do.
Of course, you can't just contact contact the LCM
anymore.
Was it Rich Alderson from, or formerly, on the list who used to work at LCM?
Used to work at, headed the project which became, was first curator for, spent
17 years at. Yeah.
Rich
35
days inactive
41
days old
27 comments
11 participants
participants (11)
-
ben -
Brent Hilpert -
Chuck Guzis -
hupfadekroua -
Jon Elson -
Michael Thompson -
Nigel Johnson Ham -
Paul Koning -
Rich Alderson -
Van Snyder -
Wayne S