9 Oct
2013
9 Oct
'13
11:42 p.m.
I ended up with an Elektronika-85 (also known as the MS-0585)that was
sold by a listmember a few weeks back. It's an uncanny clone of the Dec
Pro 350/380 both inside and out. I'm just givingit a basic inspection
at the moment and I'd like to test the power supply, I'm just unsure
what voltages / frequencies it wants and there are no labels anywhere
indicating what those might be.
My research on the 'net indicates that it's likely to be 220/240V (in
which case I'll need to get astep-up transformer), but I was wondering
if anyone here had any first-hand experience with this sort of thing.
Thanks as always,
Josh
10 Oct
10 Oct
2:24 a.m.
Josh Dersch wrote:
I ended up with an Elektronika-85 (also known as the
MS-0585)that was
sold by a listmember a few weeks back. It's an uncanny clone of the Dec
Pro 350/380 both inside and out. I'm just givingit a basic inspection
at the moment and I'd like to test the power supply, I'm just unsure
what voltages / frequencies it wants and there are no labels anywhere
indicating what those might be.
My research on the 'net indicates that it's likely to be 220/240V (in
which case I'll need to get astep-up transformer), but I was wondering
if anyone here had any first-hand experience with this sort of thing.
Thanks as always,
Josh
220V 50Hz was the standard, sorry I have no further experience
with this thing.
But good luck starting it, the russian TTL Chips at least with the brownish
case tend to be broken after long time of storage (because of humidity?)
I do have an Elektronika 60 which is something like an 11/03 but with
metric connectors.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
7 a.m.
On Thu, Oct 10, 2013 at 2:42 AM, Josh Dersch <derschjo at gmail.com> wrote:
I ended up with an Elektronika-85 (also known as the
MS-0585)that was sold
by a listmember a few weeks back. It's an uncanny clone of the Dec Pro
350/380 both inside and out.
Very cool. I've wanted to play with one of those for years.
My research on the 'net indicates that it's
likely to be 220/240V (in which
case I'll need to get astep-up transformer), but I was wondering if anyone
here had any first-hand experience with this sort of thing.
No direct experience, but Russia uses 220V @ 50Hz, as does most of the
world outside of the US, Canada, and Japan.
-ethan
11 Oct
11 Oct
12:43 p.m.
Thanks for the confirmations. The step-up from 110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
- Josh
On Thu, Oct 10, 2013 at 7:00 AM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Thu, Oct 10, 2013 at 2:42 AM, Josh Dersch
<derschjo at gmail.com> wrote:
I ended up with an Elektronika-85 (also known as
the MS-0585)that was
sold
by a listmember a few weeks back. It's an
uncanny clone of the Dec Pro
350/380 both inside and out.
Very cool. I've wanted to play with one of those for years.
My research on the 'net indicates that
it's likely to be 220/240V (in
which
case I'll need to get astep-up transformer),
but I was wondering if
anyone
here had any first-hand experience with this sort
of thing.
No direct experience, but Russia uses 220V @ 50Hz, as does most of the
world outside of the US, Canada, and Japan.
-ethan
1:33 p.m.
On Fri, Oct 11, 2013 at 2:43 PM, Josh Dersch <derschjo at gmail.com> wrote:
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
Typically, power supplies operate better at 60Hz than 50Hz, particularly
the old linear supplies. Modern switching supplies are very tolerant of
under and over voltages with a wide range of frequencies. My bet is it'll
run just fine with 60Hz.
Kyle
13 Oct
13 Oct
1:22 a.m.
Kyle Owen wrote:
On Fri, Oct 11, 2013 at 2:43 PM, Josh Dersch
<derschjo at gmail.com> wrote:
OMG...in almost the entire world PSU's are working bad because of the 50Hz?
What about 400Hz from airplanes?
SCNR,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
Typically, power supplies operate better at 60Hz than 50Hz, particularly
the old linear supplies. Modern switching supplies are very tolerant of
under and over voltages with a wide range of frequencies. My bet is it'll
run just fine with 60Hz.
Kyle 
2 a.m.
On 10/13/2013 01:22 AM, Holm Tiffe wrote:
OMG...in almost the entire world PSU's are working
bad because of the 50Hz?
What about 400Hz from airplanes?
Not all airplanes--CDC used an MG set that put out 3-phase 400Hz. With
a full-wave (bridge or star) rectifier, you got mostly DC with only
about 4% ripple at 400*6 = 2400 Hz.
On the other hand, I've worked on some old (it was old when I worked on
it a long time ago) 110V 25Hz equipment. The transformers were huge in
comparison to their 60 Hz cousins and rattled rather than hummed. You
could even see flicker in incandescent lamps--mercury-vapor lamps would
drive you crazy.
--Chuck
5:26 a.m.
Chuck Guzis wrote:
On 10/13/2013
01:22 AM, Holm Tiffe wrote:
OMG...in almost the entire world PSU's are
working bad because of the
50Hz?
What about 400Hz from airplanes?
Not all airplanes--CDC used an MG set that put out 3-phase 400Hz.
With a full-wave (bridge or star) rectifier, you got mostly DC with
only about 4% ripple at 400*6 = 2400 Hz.
On the other hand, I've worked on some old (it was old when I worked
on it a long time ago) 110V 25Hz equipment. The transformers were
huge in comparison to their 60 Hz cousins and rattled rather than
hummed. You could even see flicker in incandescent
lamps--mercury-vapor lamps would drive you crazy.
5:34 a.m.
Chuck Guzis wrote:
On 10/13/2013
01:22 AM, Holm Tiffe wrote:
OMG...in almost the entire world PSU's are
working bad because of the
50Hz?
What about 400Hz from airplanes?
Not all airplanes--CDC used an MG set that put out 3-phase 400Hz.
With a full-wave (bridge or star) rectifier, you got mostly DC with
only about 4% ripple at 400*6 = 2400 Hz.
On the other hand, I've worked on some old (it was old when I worked
on it a long time ago) 110V 25Hz equipment. The transformers were
huge in comparison to their 60 Hz cousins and rattled rather than
hummed. You could even see flicker in incandescent
lamps--mercury-vapor lamps would drive you crazy.
10:38 a.m.
On Oct 13, 2013, at 3:22 AM, Holm Tiffe <holm at freibergnet.de> wrote:
Kyle Owen wrote:
Sorry for not better explaining myself. Transformers can be made smaller by using higher
frequencies. Hence, dynamotors in airplanes are relatively small for how much power they
can deliver. Power transformers for vacuum tube era stuff run noticeably hotter at 50 Hz
than 60 Hz. Filter capacitors can be made smaller as well at 60 Hz. If chokes are used,
they too can be smaller.
Kyle
Typically, power supplies operate better at 60Hz
than 50Hz, particularly
the old linear supplies. Modern switching supplies are very tolerant of
under and over voltages with a wide range of frequencies. My bet is it'll
run just fine with 60Hz.
Kyle
OMG...in almost the entire world PSU's are working bad because of the 50Hz?
What about 400Hz from airplanes?
SCNR,
Holm 
12:01 p.m.
On 10/13/2013 1:22 AM, Holm Tiffe wrote:
Kyle Owen wrote:
It's all about the amount of iron in the power transformer.
The higher the frequency, the smaller the transformer can be. That's why
aircraft used 400 Hz. Less iron. Less weight.
That's also why switching power supplies are so much smaller. They
operate at much higher frequencies.
In general you can power 50 Hz equipment from 60 Hz. But you have to be
careful about powering 60 Hz equipment from 50 Hz - the transformer may
saturate. Don't even think about powering 400 Hz equipment from 50 Hz or
60 Hz.
There is nothing inherently /bad/ about 50 Hz.
Rob.
On Fri, Oct 11, 2013 at 2:43 PM, Josh Dersch
<derschjo at gmail.com> wrote:
OMG...in almost the entire world PSU's are working bad because of the 50Hz?
What about 400Hz from airplanes?
SCNR,
Holm
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
Typically, power supplies operate better at 60Hz than 50Hz, particularly
the old linear supplies. Modern switching supplies are very tolerant of
under and over voltages with a wide range of frequencies. My bet is it'll
run just fine with 60Hz.
Kyle
12:20 p.m.
On 10/13/2013 12:01 PM, Rob Doyle wrote:
In general you can power 50 Hz equipment from 60 Hz.
But you have to be
careful about powering 60 Hz equipment from 50 Hz - the transformer may
saturate. Don't even think about powering 400 Hz equipment from 50 Hz or
60 Hz.
If the operating voltage is adjusted, you can actually use those things.
I found that a 110V 25Hz induction-motor fan will run fine (but at
twice the speed) on 230V 60Hz. Similarly, I used 115V 400Hz
transformers with 12V 60Hz power successfully. Whether or not you can
find a 400Hz transformer with the proper turns ratio is another matter,
but I forget what I used mine for (could have been for a low-voltage
filament supply)--but it worked.
See, for example:
http://www.edn.com/design/components-and-packaging/4369085/Using-a-power-tr…
--Chuck
10:15 p.m.
Chuck Guzis wrote:
On 10/13/2013 12:01 PM, Rob Doyle wrote:
That's all a question if you can get enough inuctivity in the Windings for
the Voltage/Frequency you want to use it. The Magnetic Flux in the Core
matters.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
In general you can power 50 Hz equipment from 60
Hz. But you have to be
careful about powering 60 Hz equipment from 50 Hz - the transformer may
saturate. Don't even think about powering 400 Hz equipment from 50 Hz or
60 Hz.
If the operating voltage is adjusted, you can actually use those things.
I found that a 110V 25Hz induction-motor fan will run fine (but at
twice the speed) on 230V 60Hz. Similarly, I used 115V 400Hz
transformers with 12V 60Hz power successfully. Whether or not you can
find a 400Hz transformer with the proper turns ratio is another matter,
but I forget what I used mine for (could have been for a low-voltage
filament supply)--but it worked.
See, for example:
http://www.edn.com/design/components-and-packaging/4369085/Using-a-power-tr…
--Chuck
10:13 p.m.
Rob Doyle wrote:
On 10/13/2013 1:22 AM, Holm Tiffe wrote:
Yes Rob and Kyle, the eloctrophysical relations are clear to me.
When you have a Transformer build for 60Hz and build under economical
pressure using a high magnetical Fluxes just below what the core can
provide before to get into stauration, you get a hot Transformer when you
connect it to 50Hz.
No Problem the other way around.
But:
The rest of the world is building equipment designed for 50Hz so
the PSUs there are'nt running more bad then in the US.
Don't know any 25Hz Grid here from the past,i but there where some DC Grids
long time ago. Railway electrical Grids are build with 16,75 Hz (newer
ones with 50Hz).
...Don't get me wrong, but I hope I have never to use a 110/240V Power
grid, European standards are much better I think :-) I have 3 Phase Power
230/400V here in the House and don't want to miss it.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
Kyle Owen wrote:
It's all about the amount of iron in the power transformer.
The higher the frequency, the smaller the transformer can be. That's why
aircraft used 400 Hz. Less iron. Less weight.
That's also why switching power supplies are so much smaller. They
operate at much higher frequencies.
In general you can power 50 Hz equipment from 60 Hz. But you have to be
careful about powering 60 Hz equipment from 50 Hz - the transformer may
saturate. Don't even think about powering 400 Hz equipment from 50 Hz or
60 Hz.
There is nothing inherently /bad/ about 50 Hz.
Rob.
On Fri, Oct 11, 2013 at 2:43 PM, Josh Dersch
<derschjo at gmail.com> wrote:
OMG...in almost the entire world PSU's are working bad because of the 50Hz?
What about 400Hz from airplanes?
SCNR,
Holm
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
Typically, power supplies operate better at 60Hz than 50Hz, particularly
the old linear supplies. Modern switching supplies are very tolerant of
under and over voltages with a wide range of frequencies. My bet is it'll
run just fine with 60Hz.
Kyle
14 Oct
14 Oct
8:42 a.m.
On 10/13/2013 10:13 PM, Holm Tiffe wrote:
Don't know any 25Hz Grid here from the past,i but
there where some DC Grids
long time ago. Railway electrical Grids are build with 16,75 Hz (newer
ones with 50Hz).
Wikipedia has an interesting section on the history of various
distribution frequencies:
http://en.wikipedia.org/wiki/Utility_frequency#History
Ineresteing that AEG managed to impose their will on all of Europe
eventually--and Westinghouse in North America. I've also run into 25Hz,
60 VAC industrial equipment.
...Don't get me wrong, but I hope I have never to
use a 110/240V Power
grid, European standards are much better I think :-) I have 3 Phase Power
230/400V here in the House and don't want to miss it.
While 3-phase power is available and used for US commercial
installations, single-phase is used for residential, even though the
high-voltage distribution is three-phase. This allows the local utility
to "balance" loading, house-by-house. For example, 3-phase distribution
goes to a disconnect box where my driveway meets the public road. Within
the box, two of the three distribution lines are selected and continue
on (as buried 6600V cables) up the driveway to the single-phase
transformer sitting on a concrete pad in front of my house. The local
utility people tell me that if I wanted 3-phase, I'd have to pay for a
third buried line and 3-phase transformer. But 3-phase is already in
place should I need it.
I used to have a color monitor from Japan whose nameplate rating was
100V, 60Hz. The power plug was compatible with US receptacles.
Personally, I like the idea of the old 133Hz line frequency. Less hum,
smaller transformers.
In our shop at work, the lighting was 220V 25Hz incandescent and was
annoying--one "slow" day, I rewired the panel so that the lighting was
run from 250VDC (usually used for welding). Much better!
--Chuck
12 Oct
12 Oct
12:22 a.m.
Josh Dersch wrote:
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
- Josh
Better forget the Idea about a "direct clone".
The computers are looking like ther american originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok.
That's my experience for years. Please don't think russians are idiots
that are only able to copy something. There are performat PDP11 Processors
with no "Original" from DEC. They alo build an VAX Micro that was acting
like a VAX 750, something like this was never made by DEC.
I don't know why they copied the look of their boxes 1:1 but I'll bet you
will be not able to put a DEC card into the slots of that Machine, mostly
they copied the singals and ther order, but the pin distance is metric and
not imperial.
Boxes like the PSU will be totally different inside, but take a look into
the PSU, possibly you will find a Jumper oder soldering bridge that will
change the supply voltage to 110V.
About the 50 vs. 60Hz: that will be no problem but you will have for sure
Daytime Clock that will run away...
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
12:51 a.m.
On 10/12/2013 12:22 AM, Holm Tiffe wrote:
Josh Dersch wrote:
Well, this particular machine certainly has a lot more in common than
the exterior appearance and software compatibility. I don't have my Pro
350 handy at the moment (it's in storage) but here's a link to a picture
of the disk controller from the Pro:
http://www.pdp11gy.com/PC350/DEC350_5.jpg
And here's a picture of the same board from the Elektronika:
http://yahozna.dyndns.org/scratch/elektronika/disk%20controller.jpg
I'm sure there are some differences here, but even at a component layout
level they're very similar.
Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
- Josh
Better forget the Idea about a "direct clone".
The computers are looking like ther american originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok. 
That's my experience for years. Please don't think russians are idiots
that are only able to copy something.
I have never said such a thing.
There are performat PDP11 Processors
with no "Original" from DEC. They alo build an VAX Micro that was acting
like a VAX 750, something like this was never made by DEC.
Certainly. I have an Elektronika MK-85 (no direct relation to the
straight-85):
http://gregescov.tripod.com/calc.htm
Which is by far the most interesting use of a PDP-11 CPU clone I can
think of, though the battery life suffers for it :). (And it's a
behavioral clone of the Casio PB-100 with some enhancements and
interesting bugs...)
I don't know why they copied the look of their boxes 1:1 but I'll bet you
will be not able to put a DEC card into the slots of that Machine, mostly
they copied the singals and ther order, but the pin distance is metric and
not imperial.
I'll have to check that, as I said, I don't have the 350 on hand. But I
don't doubt that you're right.
Boxes like the PSU will be totally different inside, but take a look into
the PSU, possibly you will find a Jumper oder soldering bridge that will
change the supply voltage to 110V.
About the 50 vs. 60Hz: that will be no problem but you will have for sure
Daytime Clock that will run away...
Thanks. I did a cursory inspection of it but I'll give it another go
over just in case.
- Josh
Regards,
Holm
7:38 a.m.
Josh Dersch wrote:
Yes that thing is REALLY nice.
On 10/12/2013 12:22 AM, Holm Tiffe wrote:
Yes, in this case I think it is clear what happened, but look at this for
example:
http://www.tiffe.de/Robotron/PDP-VAX/E60/E60-01.jpg
http://www.tiffe.de/Robotron/PDP-VAX/E60/E60-02.jpg
This is the CPU of my E60, a LSI11/03 with 4KW of DRAM on it (2107 likes on
the TOP).
Look at the original DEC CPU, it looks totatally different.
The connectors are QBUS but Metric.
Josh Dersch wrote:
Well, this particular machine certainly has a lot more in common than
the exterior appearance and software compatibility. I don't have my Pro
350 handy at the moment (it's in storage) but here's a link to a picture
of the disk controller from the Pro:
http://www.pdp11gy.com/PC350/DEC350_5.jpg
And here's a picture of the same board from the Elektronika:
http://yahozna.dyndns.org/scratch/elektronika/disk%20controller.jpg Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
- Josh
Better forget the Idea about a "direct clone".
The computers are looking like ther american originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok. 
I'm sure there are some differences here, but even at a component layout
level they're very similar.
Yes.
That's my experience for years. Please don't think russians are idiots
that are only able to copy something.
I have never said such a thing.
There are performat PDP11 Processors
with no "Original" from DEC. They alo build an VAX Micro that was acting
like a VAX 750, something like this was never made by DEC.
Certainly. I have an Elektronika MK-85 (no direct relation to the
straight-85):
http://gregescov.tripod.com/calc.htm
Which is by far the most interesting use of a PDP-11 CPU clone I can
think of, though the battery life suffers for it :). (And it's a
behavioral clone of the Casio PB-100 with some enhancements and
interesting bugs...)
I'll look if I can find the schematics of the PSU from your computer,
have to find out which Kind of CBK-Something it is.
I think this is a switchmode PSU possibly you can rewrire the input to use
something like a "Greinacher" voltage doubler to get it up with 110V.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
I don't know why they copied the look of their boxes 1:1 but I'll bet you
will be not able to put a DEC card into the slots of that Machine, mostly
they copied the singals and ther order, but the pin distance is metric and
not imperial.
I'll have to check that, as I said, I don't have the 350 on hand. But I
don't doubt that you're right.
Boxes like the PSU will be totally different inside, but take a look into
the PSU, possibly you will find a Jumper oder soldering bridge that will
change the supply voltage to 110V.
About the 50 vs. 60Hz: that will be no problem but you will have for sure
Daytime Clock that will run away...
Thanks. I did a cursory inspection of it but I'll give it another go
over just in case.
- Josh
>
>Regards,
>
>Holm
13 Oct
13 Oct
1:17 a.m.
Holm Tiffe wrote:
Josh Dersch wrote:
Yes that thing is REALLY nice.
Good and Bad News: I've found the entire schematics of the MS-0585
and the PSU and I think it isn't able to work out of 110V.
It uses a small transformer without tabs and 220V input voltage for the
PSU electronics itself and the DC/DC converter itself doesn't provide
any ability to switch so 110V primary.
You have to provide 220V, but the 60Hz wouldn't be a problem.
In this file you find the PSU schematics:
http://www.tis.kz/docs/EL-85/ps-kb.rar
and on this website the entire documentation is provided:
http://www.tis.kz/forum/printpage.php?forum=31&topic=3
(all the rar files).
You will have problems with the cyrillic character set I think, the manual
quality is bad, but I thing it's better than nothing.
You need an DJVU viewer to look at the files.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
On 10/12/2013 12:22 AM, Holm Tiffe wrote:
Yes, in this case I think it is clear what happened, but look at this for
example:
http://www.tiffe.de/Robotron/PDP-VAX/E60/E60-01.jpg
http://www.tiffe.de/Robotron/PDP-VAX/E60/E60-02.jpg
This is the CPU of my E60, a LSI11/03 with 4KW of DRAM on it (2107 likes on
the TOP).
Look at the original DEC CPU, it looks totatally different.
The connectors are QBUS but Metric.
Josh Dersch wrote:
Well, this particular machine certainly has a lot more in common than
the exterior appearance and software compatibility. I don't have my Pro
350 handy at the moment (it's in storage) but here's a link to a picture
of the disk controller from the Pro:
http://www.pdp11gy.com/PC350/DEC350_5.jpg
And here's a picture of the same board from the Elektronika:
http://yahozna.dyndns.org/scratch/elektronika/disk%20controller.jpg Thanks for the confirmations. The step-up from
110->220 should be pretty
easy to deal with, but I'm wondering how tolerant this supply would be of
60Hz A/C. I suppose if it's a direct clone of the Dec Pro's supply it
might be OK, I'll have to compare :).
- Josh
Better forget the Idea about a "direct clone".
The computers are looking like ther american originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok.
I'm sure there are some differences here, but even at a component layout
level they're very similar.
Yes.
That's my experience for years. Please don't think russians are idiots
that are only able to copy something.
I have never said such a thing.
There are performat PDP11 Processors
with no "Original" from DEC. They alo build an VAX Micro that was acting
like a VAX 750, something like this was never made by DEC.
Certainly. I have an Elektronika MK-85 (no direct relation to the
straight-85):
http://gregescov.tripod.com/calc.htm
Which is by far the most interesting use of a PDP-11 CPU clone I can
think of, though the battery life suffers for it :). (And it's a
behavioral clone of the Casio PB-100 with some enhancements and
interesting bugs...)
I'll look if I can find the schematics of the PSU from your computer,
have to find out which Kind of CBK-Something it is.
I think this is a switchmode PSU possibly you can rewrire the input to use
something like a "Greinacher" voltage doubler to get it up with 110V.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
I don't know why they copied the look of their boxes 1:1 but I'll bet you
will be not able to put a DEC card into the slots of that Machine, mostly
they copied the singals and ther order, but the pin distance is metric and
not imperial.
I'll have to check that, as I said, I don't have the 350 on hand. But I
don't doubt that you're right.
Boxes like the PSU will be totally different inside, but take a look into
the PSU, possibly you will find a Jumper oder soldering bridge that will
change the supply voltage to 110V.
About the 50 vs. 60Hz: that will be no problem but you will have for sure
Daytime Clock that will run away...
Thanks. I did a cursory inspection of it but I'll give it another go
over just in case.
- Josh
>
>Regards,
>
>Holm 
12 Oct
12 Oct
9:34 a.m.
On Sat, Oct 12, 2013 at 09:22:57AM +0200, Holm Tiffe wrote:
The computers are looking like ther american originals
but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok.
[...]
About the 50 vs. 60Hz: that will be no problem but you
will have for sure
Daytime Clock that will run away...
Nitpick: doesn't the Pro use an M146818 RTC as the clock?
So if the Russian box is SW compatible, at least the line freq
won't be a SW problem. (It'll be equally annoying to everyone by
running at 64 Hz instead of either 50 or 60.)
John Wilson
D Bit
10:39 a.m.
On Oct 12, 2013, at 12:34 PM, John Wilson <wilson at dbit.com> wrote:
On Sat, Oct 12, 2013 at 09:22:57AM +0200, Holm Tiffe
wrote:
I'm having trouble finding the relevant code to confirm, but that sounds right -- 64
Hz clock interrupt rate is familiar.
paul
The computers are looking like ther american
originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok.
[...]
About the 50 vs. 60Hz: that will be no problem
but you will have for sure
Daytime Clock that will run away...
Nitpick: doesn't the Pro use an M146818 RTC as the clock?
So if the Russian box is SW compatible, at least the line freq
won't be a SW problem. (It'll be equally annoying to everyone by
running at 64 Hz instead of either 50 or 60.)
13 Oct
13 Oct
5:29 a.m.
Paul Koning wrote:
On Oct 12,
2013, at 12:34 PM, John Wilson <wilson at dbit.com> wrote:
On Sat,
Oct 12, 2013 at 09:22:57AM +0200, Holm Tiffe wrote:
The computers are looking like ther american
originals but if you are
looking deeper, they don't have much in common.
Most of the software is compatible, ok.
[...]
About the 50 vs. 60Hz: that will be no problem but
you will have for sure
Daytime Clock that will run away...
Nitpick: doesn't the Pro use an M146818 RTC as the clock?
So if the Russian box is SW compatible, at least the line freq
won't be a SW problem. (It'll be equally annoying to everyone by
running at 64 Hz instead of either 50 or 60.)
4087
days inactive
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days old
21 comments
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