Another DECDataSystem 570 version front panel just sold for $1850
https://www.ebay.com/itm/265512455331
Hm. Time to sell this old 8/I front panel. It's one of those things I
have had for 30+ years and really don't need...
On Tue, Jan 11, 2022, 4:52 PM Glen Slick wrote:
> On Sun, Jan 9, 2022 at 10:05 AM Josh Dersch via cctalk
> wrote:
> >
> > No blinkenlights. It's not exciting looking. This tracks for PDP-11s
> (and
> > 8's!) as well. No one pays big money for 11/04, 11/34, 11/44 or LSI-11
> > systems (though
On Sun, Jan 9, 2022 at 10:05 AM Josh Dersch via cctalk
wrote:
>
> No blinkenlights. It's not exciting looking. This tracks for PDP-11s (and
> 8's!) as well. No one pays big money for 11/04, 11/34, 11/44 or LSI-11
> systems (though prices are creeping up like everything else) but 11/05,
>
On Sun, Jan 9, 2022 at 2:56 AM Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:
> > This:
> > https://www.ebay.com/itm/275084268137
> > ...
> > Anyway I fully expect it to go ... for a _lot_ more than the opening
> price.
>
> Much to my surprise, it didn't sell at all
On 1/9/22 8:17 AM, P Gebhardt via cctalk wrote:
I'm rather puzzled that an -11/70 will sell for north of $10K, while a /780
can't fetch $5K. I can only guess that PDP-11'S are seen as more important in
the collector world (even though the BSD work, which had such a huge impact on
UNIX, which has
>I'm rather puzzled that an -11/70 will sell for north of $10K, while a /780
>can't fetch $5K. I can only guess that PDP-11'S are seen as more important in
>the collector world (even though the BSD work, which had such a huge impact on
>UNIX, which has now - in the form of Linux - taken over the
> This:
> https://www.ebay.com/itm/275084268137
> ...
> Anyway I fully expect it to go ... for a _lot_ more than the opening
price.
Much to my surprise, it didn't sell at all (although a number of other lots,
likely from this machine, did.)
I'm rather puzzled that an -11/70
tis 2022-01-04 klockan 08:40 -0700 skrev Grant Taylor via cctalk:
> On 1/4/22 12:14 AM, Chuck Guzis via cctalk wrote:
> > Seymour Cray, along with Bill Norris and Jim Thornton and others
> > left Remington Rand/UNIVAC after Rand bought the near-bankrupt ERA.
> > Apparently, the work environment
On Tue, Jan 4, 2022 at 5:17 PM Rich Alderson via cctalk <
cctalk@classiccmp.org> wrote:
>
> We did not have a 3phase outlet on the second floor of the building where
> the
> collection was housed, and there was no room for the first VAX in the small
> computer room on the third floor, so Ian and
On 1/4/2022 5:17 PM, Rich Alderson via cctalk wrote:
I've been reading this thread for the last few days, without the time to reply.
All the statutes of limitations have run out, so I can tell the story; it will
be clear shortly why I'm piggybacking on Guy's post.
Someday we will all gather
> Date: Tue, 04 Jan 2022 14:44:00 -0800
> From: Van Snyder via cctalk
> On Tue, 2022-01-04 at 17:17 -0500, Rich Alderson via cctalk wrote:
>> Paul Allen wanted me to acquire a VAX-11/780 for his
>> collection
> John Zabolitzky has an operating VAX -- I don't know the vintage --
> eleven
As the owner of a VAX-11/780 I can confirm what Guy says about the 866
power controller. This is the only component that needs 3-phase power.
There is a small 3-phase transformer inside that provides 24V DC to the
control circuitry. The power controller not only interfaces to the DEC
power
On Tue, 2022-01-04 at 17:17 -0500, Rich Alderson via cctalk wrote:
> Paul Allen wanted me to acquire a VAX-11/780 for his
> collection
John Zabolitzky has an operating VAX -- I don't know the vintage --
eleven cabinets, in his collection in Neubiberg, a southeastern suburb
of Munich.
He also has
> Date: Sat, 1 Jan 2022 13:19:51 -0800
> From: Guy Sotomayor via cctalk
> On 1/1/22 10:40 AM, Paul Koning via cctalk wrote:
>>> On Jan 1, 2022, at 1:12 PM, Noel Chiappa via cctalk
>>> wrote:
>>> This:
>>> https://www.ebay.com/itm/275084268137
>>> The starting price is expensive, but
>
>
> Date: Mon, 3 Jan 2022 11:39:01 -0500
> From: Chris Zach
>
> The thing that always made me wonder is where are all the 8600's. The
> 8600 was apparently the best selling large Vax, outselling the 780 and
> 750, so what happened to all of them? They weren't any bigger than a 780...
>
> C
>
On 1/4/22 7:40 AM, Grant Taylor via cctalk wrote:
> I guess I thought that since Seymour left CDC to form Cray Research,
> that meant that he was more of an employee at CDC and had less influence
> on how it operated as a company. I would have assumed that someone that
> was a founder would have
On Jan 4, 2022, at 4:05 AM, P Gebhardt via cctalk wrote:
>
>
>> There's a photo on twitter:
>>
>> https://twitter.com/DonaldM38768041/status/1215804561333473280/photo/2
>>
>> showing a guy standing before an open one at Fermilab.
>
>
> In of the pictures are shown some very handy tape and
On 1/4/22 9:40 AM, Grant Taylor via cctalk wrote:
On 1/4/22 12:14 AM, Chuck Guzis via cctalk wrote:
Seymour Cray, along with Bill Norris and Jim Thornton and
others left Remington Rand/UNIVAC after Rand bought the
near-bankrupt ERA. Apparently, the work environment at
Rand was felt to be
> On Jan 4, 2022, at 10:40 AM, Grant Taylor via cctalk
> wrote:
>
> On 1/4/22 12:14 AM, Chuck Guzis via cctalk wrote:
>> Seymour Cray, along with Bill Norris and Jim Thornton and others left
>> Remington Rand/UNIVAC after Rand bought the near-bankrupt ERA. Apparently,
>> the work
On 1/4/22 12:14 AM, Chuck Guzis via cctalk wrote:
Seymour Cray, along with Bill Norris and Jim Thornton and others
left Remington Rand/UNIVAC after Rand bought the near-bankrupt ERA.
Apparently, the work environment at Rand was felt to be stifling.
Norris had all of the Navy connections and
>There's a photo on twitter:
>
>https://twitter.com/DonaldM38768041/status/1215804561333473280/photo/2
>
>showing a guy standing before an open one at Fermilab.
In of the pictures are shown some very handy tape and disk pack holders on
wheels. I never saw such fancy holders. Would be great to
On 1/3/22 6:49 PM, Grant Taylor via cctalk wrote:
> On 1/3/22 4:01 PM, Chuck Guzis via cctalk wrote:
>> https://twitter.com/DonaldM38768041/status/1215804561333473280/photo/2
>
> Interesting series of tweets.
>
> I'm surprised by the tweet about Seymour Cray founding Control Data
> Corporation.
On 1/3/22 4:01 PM, Chuck Guzis via cctalk wrote:
https://twitter.com/DonaldM38768041/status/1215804561333473280/photo/2
Interesting series of tweets.
I'm surprised by the tweet about Seymour Cray founding Control Data
Corporation. I know that Cray /worked/ for CDC, and left to found Cray
On 1/3/22 1:23 PM, Paul Koning wrote:
> The 6603 is highly unusual because it has 12 bit parallel data flow, rather
> than bit-serial as everyone else did (until Cray went back to parallel with
> the Cray 1, if I remember right). That made the 6603 very much faster, as
> far as data
> On Jan 3, 2022, at 3:36 PM, Chuck Guzis via cctalk
> wrote:
>
> On 1/3/22 10:58 AM, Paul Koning via cctalk wrote:
>> The discussion about 3-phase made me check some documentation.
>
>> I also looked at some CDC 6000 series docs. Those used 400 Hz 3 phase for
>> supplying the CPU and
On 1/3/22 10:58 AM, Paul Koning via cctalk wrote:
> The discussion about 3-phase made me check some documentation.
> I also looked at some CDC 6000 series docs. Those used 400 Hz 3 phase for
> supplying the CPU and peripheral logic. The CPU cabinets also take 3 phase
> mains power for the
On Mon, Jan 3, 2022 at 11:47 AM emanuel stiebler via cctalk <
cctalk@classiccmp.org> wrote:
> On 2022-01-03 13:19, Ethan Dicks via cctalk wrote:
>
> > Compiling all the code for our product took the 11/750 6 hours to
> > compile and link plus an additional 2 hours for an 11/730 to link
> > under
Only F*tran, which we used for predicting race horse results on the
midnight shift. The enterprise app was written in ART418 assembler.
I'm having lots of fun with the ESDI drives, got one running RT11 on the
11/73, and one running NetBSD on the MicroVAX, but then tried the two I
got from
On 2022-01-03 2:37 p.m., Nigel Johnson Ham via cctalk wrote:
Hit Compile?
In my first job, it was triggered by the EOJ card!
You had a COMPILER?
As far as I can see, these days the state of the art is to crash at
runtime for as many different stupid reasons as possible.
--T
(get off my
Hit Compile?
In my first job, it was triggered by the EOJ card!
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: tilbury2591nw.john...@ieee.org
On 2022-01-03 13:47, emanuel stiebler via cctalk wrote:
On 2022-01-03 13:19,
The discussion about 3-phase made me check some documentation.
The drive I remembered that uses 3-phase power is the RP04. I remember a
warning to the installer to verify the phase order; if that's wrong the drive
will try to spin up in the wrong direction, which might partially unscrew the
On 2022-01-03 13:19, Ethan Dicks via cctalk wrote:
Compiling all the code for our product took the 11/750 6 hours to
compile and link plus an additional 2 hours for an 11/730 to link
under a different version of VMS. 8 hours total to rebuild totally
from source. Some things about the good old
> On Jan 3, 2022, at 10:19 AM, Ethan Dicks via cctalk
> wrote:
>
> On Mon, Jan 3, 2022 at 12:29 PM Bill Gunshannon via cctalk
> wrote:
>> On 1/3/22 11:50 AM, Ethan Dicks via cctalk wrote:
>>> I'll agree with that. We used to run 40-50 users on our 8MB 11/750
>>> (with both CMI and Unibus
On Mon, Jan 3, 2022 at 12:29 PM Bill Gunshannon via cctalk
wrote:
> On 1/3/22 11:50 AM, Ethan Dicks via cctalk wrote:
> > I'll agree with that. We used to run 40-50 users on our 8MB 11/750
> > (with both CMI and Unibus disk) but it did do some swapping over 8-10
> > users.
>
> You obviously
On Jan 3, 2022, at 8:39 AM, Chris Zach via cctalk wrote:
>
> The thing that always made me wonder is where are all the 8600's. The 8600
> was apparently the best selling large Vax, outselling the 780 and 750, so
> what happened to all of them? They weren't any bigger than a 780...
The only
On 1/3/22 11:50 AM, Ethan Dicks via cctalk wrote:
On Mon, Jan 3, 2022 at 12:18 AM Warner Losh via cctalk
wrote:
I had accounts on a MicroVAX 2 and a VAX 11/750. The microvax was faster
for most compute jobs, but the 750 with 1/4 the memory handled more users
mostly in text editors with the
On 1/3/22 9:16 AM, emanuel stiebler via cctalk wrote:
On 2022-01-03 08:54, Noel Chiappa via cctalk wrote:
Not too surprising; the /780 and /785 are basically the
same machine. (In
fact, one could convert a /780 to a /785 by pulling out
the /780 CPU cards
and replacing them with a set of /785
On 1/2/22 7:11 PM, Grant Taylor via cctalk wrote:
but the 780 was really slow. I have a Microvax II here
that would equal it CPU speed-wise, and the running of
the main memory on the SBI was cool for the 782 option
but was pretty slow.
Can I ask for a rough translation in to comparative
On Mon, Jan 3, 2022 at 12:18 AM Warner Losh via cctalk
wrote:
> I had accounts on a MicroVAX 2 and a VAX 11/750. The microvax was faster
> for most compute jobs, but the 750 with 1/4 the memory handled more users
> mostly in text editors with the occasional compile or nroff/troff jobs.
> IIRC,
On Jan 2, 2022, at 9:18 PM, Warner Losh wrote:
>
> I had accounts on a MicroVAX 2 and a VAX 11/750. The microvax was faster for
> most compute jobs, but the 750 with 1/4 the memory handled more users mostly
> in text editors with the occasional compile or nroff/troff jobs. IIRC, the
> 750 had
There should be more /785s out there than plain /780...
IIRC, most /780 were upgraded, as the "old" /780 had some EMC issues
in the field? Am I dreaming this up?
The thing that always made me wonder is where are all the 8600's. The
8600 was apparently the best selling large Vax, outselling the
> On Jan 2, 2022, at 9:14 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/2/22 6:59 PM, ben via cctalk wrote:
>> But can the Pi handle a gazillion students all time sharing at once @ 2400?
>
> I think that will depend on how you connect the serial terminals.
>
> I know that it's possible to
On 2022-01-03 08:54, Noel Chiappa via cctalk wrote:
Not too surprising; the /780 and /785 are basically the same machine. (In
fact, one could convert a /780 to a /785 by pulling out the /780 CPU cards
and replacing them with a set of /785 cards; basically the same cards, with
the 74S chips
> From: Grant Taylor
> From that last picture, it looks like one of the plugs is five pronged,
> and looks very similar to the 120/208V 30A 3? plug in one of the
> pictures about the current 780 auction.
Not too surprising; the /780 and /785 are basically the same machine. (In
On Sun, Jan 02, 2022 at 06:59:47PM -0700, ben via cctalk wrote:
> On 2022-01-02 6:28 p.m., Zane Healy via cctalk wrote:
[...]
>> On that note a Raspberry Pi 2b running SIMH/VAX is about 1.6 VUPS.
> But can the Pi handle a gazillion students all time sharing at once @
> 2400? How long was the VAX
> -Original Message-
> From: cctalk On Behalf Of ben via cctalk
> Sent: 03 January 2022 02:00
> To: cctalk@classiccmp.org
> Subject: Re: VAX 780 on eBay
>
> On 2022-01-02 6:28 p.m., Zane Healy via cctalk wrote:
> > On Jan 2, 2022, at 5:20 PM, Nigel John
I had accounts on a MicroVAX 2 and a VAX 11/750. The microvax was faster
for most compute jobs, but the 750 with 1/4 the memory handled more users
mostly in text editors with the occasional compile or nroff/troff jobs.
IIRC, the 750 had faster disks...
Warner
On Sun, Jan 2, 2022, 9:35 PM Zane
Yup. The 8600's (UMBC1 and 2) were connected to Bitnet, and I was a
little Bitnaught until I found AI. It might have connected through the
Gandalf network or something else, I'd have to check old printouts.
Can I ask for a rough translation in to comparative VAX Units of
Performance (VUPs)?
On Sun, Jan 2, 2022 at 11:31 PM Chris Zach via cctalk
wrote:
> Oh yes, the 730 is probably the neatest little "pocket Vax". Especially
> if you have the R80 drive as well as the RL02. The R80 did not use the
> Unibus, correct?
Correct. The R80 connects to the RB730 controller which has its own
Maybe you were thinking the 11/73? I think the 83 was quicker, and the
93/94 hit the 1 VUP speed...
C
On 1/2/2022 11:35 PM, Zane Healy wrote:
The worst part is I know it’s 0.9 VUPS.
Zane
On Jan 2, 2022, at 6:36 PM, Toby Thain via cctalk wrote:
On 2022-01-02 9:33 p.m., Chris Zach via
The worst part is I know it’s 0.9 VUPS.
Zane
> On Jan 2, 2022, at 6:36 PM, Toby Thain via cctalk
> wrote:
>
> On 2022-01-02 9:33 p.m., Chris Zach via cctalk wrote:
>> Microvax 2 is .9 vup.
>
> Oops, Zane vupped up.
>
>> C
>>> On January 2, 2022 9:10:39 PM EST, Grant Taylor via cctalk
The VAX-11/780 may be very slow, but it is still still quite a bit faster than
my 11/730. That being said, the 11/730 captures the look and feel of that era
of VAX in a much smaller volume and with a lot lower energy cost.
Oh yes, the 730 is probably the neatest little "pocket Vax".
On 2022-01-02 9:33 p.m., Chris Zach via cctalk wrote:
Microvax 2 is .9 vup.
Oops, Zane vupped up.
C
On January 2, 2022 9:10:39 PM EST, Grant Taylor via cctalk
wrote:
On 1/2/22 6:18 PM, Zane Healy via cctalk wrote:
VAX-11/780 = 1 VUP
VAX-11/782 = 1.8 VUP
MicroVAX 1 = 0.3 VUP
MicroVAX 2
Microvax 2 is .9 vup.
C
On January 2, 2022 9:10:39 PM EST, Grant Taylor via cctalk
wrote:
>On 1/2/22 6:18 PM, Zane Healy via cctalk wrote:
>> VAX-11/780 = 1 VUP
>> VAX-11/782 = 1.8 VUP
>> MicroVAX 1 = 0.3 VUP
>> MicroVAX 2 = 0.7 VUP
>
>Thank you Zane.
>
>
>
>--
>Grant. . . .
>unix || die
--
On Sat, Jan 1, 2022, 12:33 Paul Koning via cctalk
wrote:
> Largely true, but some disk drives (RP06? RP04?) use 3-phase spindle
> motors.
>
The RP06 has 3-phase power input (and output, phase-rotated, for a second
drive), but uses a single phase spindle motor. The US version runs the
spindle
On 1/2/22 6:59 PM, ben via cctalk wrote:
But can the Pi handle a gazillion students all time sharing at once
@ 2400?
I think that will depend on how you connect the serial terminals.
I know that it's possible to establish network connectivity to serial
terminal servers. I don't know how
On 1/2/22 6:18 PM, Zane Healy via cctalk wrote:
VAX-11/780 = 1 VUP
VAX-11/782 = 1.8 VUP
MicroVAX 1 = 0.3 VUP
MicroVAX 2 = 0.7 VUP
Thank you Zane.
--
Grant. . . .
unix || die
On 2022-01-02 6:28 p.m., Zane Healy via cctalk wrote:
On Jan 2, 2022, at 5:20 PM, Nigel Johnson Ham via cctalk
wrote:
I've always felt that in terms of performance the proper measure would have
been VUPS/kW :-)
That way my little MicroVAX 2 would be able to hold its head high!
On that
On Jan 2, 2022, at 5:20 PM, Nigel Johnson Ham via cctalk
wrote:
>
> I've always felt that in terms of performance the proper measure would have
> been VUPS/kW :-)
>
> That way my little MicroVAX 2 would be able to hold its head high!
On that note a Raspberry Pi 2b running SIMH/VAX is about
I've always felt that in terms of performance the proper measure would
have been VUPS/kW :-)
That way my little MicroVAX 2 would be able to hold its head high!
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype:
> On Jan 2, 2022, at 5:11 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/2/22 5:20 PM, Chris Zach via cctalk wrote:
>> I keep thinking about it, but no. The 780 was neat from a historical
>> perspective, and the 785 at UMBC (UMBC5) ran Ultrix (and was on the ARPANET,
>> not the crappy
On 1/2/22 5:20 PM, Chris Zach via cctalk wrote:
I keep thinking about it, but no. The 780 was neat from a historical
perspective, and the 785 at UMBC (UMBC5) ran Ultrix (and was on the
ARPANET, not the crappy Bitnet the 8600's were on)
Is that Bitnet as in the Because it was there network that
> On Jan 2, 2022, at 4:20 PM, Chris Zach via cctalk
> wrote:
>
> On 1/2/2022 6:21 PM, Mark J. Blair via cctalk wrote:
>> I am seriously lusting after that VAX-11/780 system on eBay
> I keep thinking about it, but no. The 780 was neat from a historical
> perspective, and the 785 at UMBC
On 1/2/2022 6:21 PM, Mark J. Blair via cctalk wrote:
I am seriously lusting after that VAX-11/780 system on eBay
I keep thinking about it, but no. The 780 was neat from a historical
perspective, and the 785 at UMBC (UMBC5) ran Ultrix (and was on the
ARPANET, not the crappy Bitnet the 8600's
In the unlikely event that I win the lottery before that 11/780 batch sells,
I'm going to buy it, buy a box truck, go pick it up, and then leave the box
truck parked outside while I build a new building to put it all in. :D
--
Mark J. Blair
Blog:https://www.nf6x.net
Git:
> On Jan 2, 2022, at 1:03 PM, Toby Thain via cctalk
> wrote:
>
> On 2022-01-02 2:48 p.m., Noel Chiappa via cctalk wrote:
>> > From: Jonathan Chapman
>> > Last one that went auction-style on eBay went for $1,178.00
>> When was that?
>> Do you have any details of the machine's config?
The poles supplying my rural property just have one phase of 12kV on them, so
even if SCE was willing to provide 3ø service to me, I bet it would be
*expensive* to get the whole line upgraded to 3ø service all the way up to the
last pole with all three phases present. I think that's probably
Ah yes! And I am in Arizona too.. Ed#
Sent from the all new AOL app for Android
On Sun, Jan 2, 2022 at 2:12 PM, emanuel stiebler via
cctalk wrote: On 2022-01-02 16:03, Toby Thain via
cctalk wrote:
> On 2022-01-02 2:48 p.m., Noel Chiappa via cctalk wrote:
>> > From: Jonathan
On 1/2/22 12:16 PM, Jonathan Chapman via cctalk wrote:
In North America? Good luck! Part of what got me to buy a
smallish industrial building was needing three phase. It's usually
cheaper/easier to either use a VFD if it's for motor equipment, or a
rotary converter, than trying to get the
On 1/2/22 2:03 PM, Toby Thain via cctalk wrote:
https://i.imgur.com/OjQWk55.jpg
From that last picture, it looks like one of the plugs is five pronged,
and looks very similar to the 120/208V 30A 3ɸ plug in one of the
pictures about the current 780 auction.
I can't tell if the other plug is
On 2022-01-02 16:03, Toby Thain via cctalk wrote:
On 2022-01-02 2:48 p.m., Noel Chiappa via cctalk wrote:
> From: Jonathan Chapman
> Last one that went auction-style on eBay went for $1,178.00
When was that?
Do you have any details of the machine's config?
That's a pretty good
That's the one! Clearly I forgot some of the details.
Thanks,
Jonathan
‐‐‐ Original Message ‐‐‐
On Sunday, January 2nd, 2022 at 16:03, Toby Thain via cctalk
wrote:
> On 2022-01-02 2:48 p.m., Noel Chiappa via cctalk wrote:
>
> > > From: Jonathan Chapman
> >
> > > Last one
On 2022-01-02 2:48 p.m., Noel Chiappa via cctalk wrote:
> From: Jonathan Chapman
> Last one that went auction-style on eBay went for $1,178.00
When was that?
Do you have any details of the machine's config?
That's a pretty good deal for a 780 (IMO).
Someone I know won a '785, Feb
On 1/2/22 11:16 AM, Jonathan Chapman via cctalk wrote:
>> I'd really like 3ɸ at home for a number of different things.
>
> In North America? Good luck! Part of what got me to buy a smallish industrial
> building was needing three phase. It's usually cheaper/easier to either use a
> VFD if it's
> From: Jonathan Chapman
> Last one that went auction-style on eBay went for $1,178.00
When was that?
Do you have any details of the machine's config?
That's a pretty good deal for a 780 (IMO).
Noel
> I'd really like 3ɸ at home for a number of different things.
In North America? Good luck! Part of what got me to buy a smallish industrial
building was needing three phase. It's usually cheaper/easier to either use a
VFD if it's for motor equipment, or a rotary converter, than trying to get
On 1/1/22 2:00 PM, Chris Zach via cctalk wrote:
This is wise, but 240v is quite nice for computer equipment. I had an
electrician run a 240v 30a (10g wire) circuit out to my work shed, where
a subpanel is installed with 120v 15a and 240v 15a circuits for the
equipment.
I had two 120v 20A
On 1/1/22 2:44 PM, Guy Dunphy via cctalk wrote:
The 'installation and configuration' manual for this machine would be huge.
They don't have it.
On bitsavers. I just paged through it to check power
consumption.
Plus, it's a mainframe. Not even any blinkenlights. Without setting it up as
On 1/1/22 3:19 PM, Josh Dersch via cctalk wrote:
For clarification -- the 11/780 is not liquid cooled. The seller mixed up
some photos between the TU77 listing and the 11/780 listing (the TU77
listing has photos of the 11/780's backplane in it just to make things more
fun). Agreed on all
On 1/1/22 2:35 PM, ben via cctalk wrote:
On 2022-01-01 12:36 p.m., Jon Elson via cctalk wrote:
On 1/1/22 1:11 PM, Bill Gunshannon via cctalk wrote:
Just out of curiosity, how much current is needed for an
11/780?
Depending on options, the CPU cabinet would draw about
10-12 A per line,
> On Jan 1, 2022, at 4:19 PM, Josh Dersch via cctalk
> wrote:
>
> On Sat, Jan 1, 2022 at 12:47 PM Guy Dunphy via cctalk
> wrote:
>
>> ...
>> But you're all focussed on that, and missing another important detail. The
>> machine has a liquid cooling system.
>> ...
>
> For clarification --
On Sat, Jan 1, 2022 at 12:47 PM Guy Dunphy via cctalk
wrote:
> At 07:50 PM 1/01/2022 +, you wrote:
> >>
> >True. But if you're trying to get > $5000 for something, it doesn't seem
> unreasonable to suggest that investing a bit in getting an extension cord
> run to the location of the
On 1/1/22 10:40 AM, Paul Koning via cctalk wrote:
On Jan 1, 2022, at 1:12 PM, Noel Chiappa via cctalk
wrote:
This:
https://www.ebay.com/itm/275084268137
The starting price is expensive, but probably not utterly unreasonable,
given that:
- the 780 was the first VAX, and thus
In my current house I have done 240V/50A wiring, 240V/50A Sub Panel,
lots of 240V/30A outlets. None of which I would advise the usual
amateur to do. :-)
This is wise, but 240v is quite nice for computer equipment. I had an
electrician run a 240v 30a (10g wire) circuit out to my work shed,
The TU77 has a 3ɸ power plug on it. That probably explains why testing
it would be problematic in a residential settings.
A TU77 can run on household 240v. If I recall it used the 240 for the
big blower motor and the rest of the stuff ran on 110.
1ɸ240V is vastly different than 3ɸ120/208V.
At 07:50 PM 1/01/2022 +, you wrote:
>>
>True. But if you're trying to get > $5000 for something, it doesn't seem
>unreasonable to suggest that investing a bit in getting an extension cord run
>to the location of the machine would be a good idea. The absence of that
>effort makes me wonder
TU77: https://www.ebay.com/itm/275083502085 (The 11/780 is visible in
That looks complete with the TM03 formatter.
RM05: https://www.ebay.com/itm/284587865252
That looks like it's missing the MassBus adapter. I think two RM05's
shared a cabinet between them that contained the MBA logic. Not
> Way more because of inertia. Not quite a UPS, but short power glitches enough
> to blink the computer room lights are not going to be seen by the mainframe.
Indeed, one can purchase flywheel systems to ride through genset startup time
on inertia!
Thanks,
Jonathan
On 2022-01-01 12:36 p.m., Jon Elson via cctalk wrote:
On 1/1/22 1:11 PM, Bill Gunshannon via cctalk wrote:
Just out of curiosity, how much current is needed for an 11/780?
Depending on options, the CPU cabinet would draw about 10-12 A per line,
3-Phase 208 V. And, that is on the upper end
On 1/1/22 1:56 PM, W2HX via cctalk wrote:
The other benefit to 3phase power to something like a computer is that the
filter caps required can be much smaller. Once you rectify three phases 60* you
get MUCH less ripple because every 60 degrees you have a new peak arriving.
When you have a real
On 1/1/22 1:50 PM, W2HX via cctalk wrote:
True. But if you're trying to get > $5000 for something, it doesn't seem
unreasonable to suggest that investing a bit in getting an extension cord run to
the location of the machine would be a good idea. The absence of that effort
makes me wonder if
> On Jan 1, 2022, at 3:08 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/1/22 12:44 PM, Paul Koning via cctalk wrote:
>> ...
>> And of course 400 Hz gave them an additional advantage in reduced
>> transformer size and reduced ripple (for a given filter capacitor).
>
> I was going to ask how
On Sat, Jan 1, 2022 at 11:55 AM W2HX via cctalk
wrote:
> >
> True. But if you're trying to get > $5000 for something, it doesn't seem
> unreasonable to suggest that investing a bit in getting an extension cord
> run to the location of the machine would be a good idea. The absence of
> that
It splits the input 3 phase 120/208 30A input to separate 120V circuits.
3*30A 120V circuits if you want. Mine used about 3KVA, so it'll actually
(just barely) run off of a single 30A/120V or multiple 15/20A 120V circuits
if you rewire the input a bit.
Patrick Finnegan
On Sat, Jan 1, 2022, 14:11
On 1/1/22 12:59 PM, Jonathan Chapman via cctalk wrote:
They're 180 degrees out. Sufficiently different for a number of
applications, but certainly not all!
They are 180° out of phase with respect to each other. But they are the
same single phase when viewed by anything outside of them.
On 1/1/22 12:44 PM, Paul Koning via cctalk wrote:
Could be. For the CDC case, I see actual 3-phase DC supplies, i.e.,
3 phase bridge rectifiers fed by 3-phase transformers.
Interesting. That brings to mind 6ɸ DC supplies. -- Two typical 3ɸ
rectifier networks (making DC pulses be 60°
> I have questions
>
> Where are you getting two /different/ phases? -- Remember, the
> different legs on residential 120/240 wiring are really the same single
> phase.
They're 180 degrees out. Sufficiently different for a number of applications,
but certainly not all!
Thanks,
Jonathan
and Off-Topic Posts
Subject: Re: VAX 780 on eBay
> I think that's the same with all the /computer/ equipment that I've
> seen which connects to 3ɸ power. A single phase could be used for all of it.
Computer exist which require three phase at a unit power supply level. It's
often als
On 1/1/22 12:43 PM, Dennis Boone via cctalk wrote:
My Multiprise 2003/205 claims to want a pair of 3-phase inputs.
Is it assumed that those 2 x 3ɸ inputs are feed from different paths,
thus path redundancy? I'd think that the phases would be the same.
I've run it on two "phases" on a
>
True. But if you're trying to get > $5000 for something, it doesn't seem
unreasonable to suggest that investing a bit in getting an extension cord run
to the location of the machine would be a good idea. The absence of that
effort makes me wonder if the owner knows what the outcome of such
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