开云体育

On Tue, Jul 27, 2021 at 07:59 PM, Raymond Domp Frank wrote:

I think I may even see one of the guys in the photograph in that video.

That'd be Chris Burton in the video, the person in front in the photograph.

Raymond

Since Tektronix did offer the silicon rectifiers as an upgrade, I'd think either would be proper, depending on whether or not you want to be serial number accurate.

As I remember previous discussions, the lack of filament drain from the HV transformer will unload the supply a bit, and should make the parts run a bit cooler.? I do think you should check the HV for proper readings after this.? Tek WIKI may have the instructions for that replacement kit.

Harvey

Manchester (Baby or Mark I) fits the bill:
- UK (mains sockets)
- Modules (with big, vertical cans, orientation), see photographs on-line
- Williams Tube (memory, also visible in photographs on the web)
- Restoration project (age and looks of instrumentation and two guys working on it)
- See "Manchester Baby: world's first stored program computer" on YouTube. I think I may even see one of the guys in the photograph in that video.

Raymond

On 2021-07-27, at 19:11, cheater cheater <cheater00social@...> wrote:

Seven - one in the open relay rack in the middle right. But that might
be a vector scope, too, or a distortion meter.

Williams tube.



Grü?e, Carsten

I have just made up a few TM500 prototyping boards from JLCPCB, who added chamfered edges to the card edge fingers, but (based on ditter2's post of two years ago) it looks like I will need to do the "rolling" on the fingers. Does anybody know how much force is required to do this, and what kind of setup I would need?

I can do some minor fabrication with a drill press, but anything more is beyond my current skill or equipment.

-- Jeff Dutky

I agree with DaveB. UK type power sockets.
Rack equipment looks like very old stuff for 1997 - so restoration project of some sort.
Where are the DSO's for 1997?
Engineers/technicians - no ties - so quite casual and appropriate for the times?
Age of the people implies a retirement/volunteer project of some sort.
Round cans on many racks - possibly coils and capacitors or canned relays a plenty - not many tubes visible- so maybe old fashioned transmission equipment for telecomms.
The building is big! huge column in view suggests tall building with very high floor to ceiling maybe in a city somewhere.
Raised floor system suggests a commercial premises - not a hut at Bletchley Park.
Geoff.

Seven - one in the open relay rack in the middle right. But that might
be a vector scope, too, or a distortion meter.

On Tue, Jul 27, 2021 at 5:57 PM Chris Wilkson via groups.io
<cwilkson@...> wrote:

I have that book! Very much an oversized coffee table type book. It's a fun one.
Intel gifted it to us when it was first published. Back when large employers still valued their employees happiness, blah, blah, blah...

IIRC, Intel worked with the author directly to make the book happen? Memory is fuzzy.
I think everything in the book took place within the space of 24 hours, somewhere on the globe. So it very much is a time capsule from that day.

I count at least 6 scopes in that picture.

I am sure that substitute does the job well enough. Though - from the historian's point of view I still prefer the 5642 as long as they van be obtained. Tubes are something else than seleniums!
Joe

I haven't used OSH Park before. But everyone knows those purple boards! (beautiful!) :)
I don't think they offer chamfering unless it's recently changed. It's been discussed in the past and it adds steps to the process (therefore cost!).

Some board houses that I know will do beveling:
Advanced Circuits does it for sure. I have used them for plug in cards before. Located in Denver, Colorado, USA. (very high quality but expensive)
Gold Phoenix does it for sure. For gold fingers they do it automatically. For solder (HASL) fingers they will do it only if you specifically ask. Located in China. (good quality, inexpensive-to-reasonable cost)
JLCPCB does it on boards > 5x5cm. I just made my first order from them but not with edge fingers. I haven't seen the boards yet, so quality is TBD. Located in China. (quality = ?TBD?, super unbelievably cheap!)

For prototyping, I plan to simply snake wires out and onto the bench, at
least that's my plan until it doesn't work.

I currently have a 10-way ribbon cable snaking out so I can analyse the
readout timeslot pulses.

My plan would be to spin a PCB for whatever solution(s) I end up with.

I assume this could be adapted for the 5000 series pretty easily, but
that's not on my radar screen.

I do plan to make my work available without restriction, so others can
tweak/experiment/improve.

For instance, my plan for the readout interface is to create an SPI-based
sub-system that deals with all the current source and voltage adaptation,
so that it could be easily bolted onto any micro that can field an
interrupt and talk SPI at a reasonable rate.

On Tue, Jul 27, 2021 at 11:22 AM Chris Wilkson via groups.io <cwilkson=
[email protected]> wrote:

EDIT/UPDATE...I see from the photos that you've already plugged it in. I
hope you had the PCB beveled. :)
---------------
First let me say I like this project!
I wanted to do it for a long time myself and I was also targeting the
7904A.
I even got as far as buying a 7A17 prototyping plugin from Dennis.
But then the project stalled because my 7904A has some issues and I put
the project (and the scope) on the shelf until "later".
It's good to see someone taking up the challenge.

The breakout PCB is a good idea. Saves wear and tear on the backplane
connector.
While prototyping/testing, do you plan to mount your application circuits
in the same plugin?
Or will you snake wire + cables out the front or side of the mainframe for
easier access until you're happy with the test circuits?
I assume everything would be on a single PCB in the final design?

I'll be following this project. Good luck!

--
Andy

EDIT/UPDATE...I see from the photos that you've already plugged it in. I hope you had the PCB beveled. :)
---------------
First let me say I like this project!
I wanted to do it for a long time myself and I was also targeting the 7904A.
I even got as far as buying a 7A17 prototyping plugin from Dennis.
But then the project stalled because my 7904A has some issues and I put the project (and the scope) on the shelf until "later".
It's good to see someone taking up the challenge.

The breakout PCB is a good idea. Saves wear and tear on the backplane connector.
While prototyping/testing, do you plan to mount your application circuits in the same plugin?
Or will you snake wire + cables out the front or side of the mainframe for easier access until you're happy with the test circuits?
I assume everything would be on a single PCB in the final design?

I'll be following this project. Good luck!

Thanks for the reminder.
Yes, I did manually chamfer the edges before inserting the board, but the
reminder is good for anyone contemplating similar experiments.
I am unsure how to request chamfered edges from OSHpark (who I use for my
prototypes), that is on my list of things to research before the next board
order.

On Tue, Jul 27, 2021 at 11:12 AM Chris Wilkson via groups.io <cwilkson=
[email protected]> wrote:

Real quick...

Before you plug that into a scope, make sure your PCB edge is chamfered!
Don't plug a raw cut PCB into the scope or you have a good chance of
damaging the female connector on the backplane.

Maybe the fab already did that for you, or you did it at home with a
file. It's hard to tell from the photos.

--
Andy

Real quick...

Before you plug that into a scope, make sure your PCB edge is chamfered!
Don't plug a raw cut PCB into the scope or you have a good chance of damaging the female connector on the backplane.

Maybe the fab already did that for you, or you did it at home with a file. It's hard to tell from the photos.

I have that book! Very much an oversized coffee table type book. It's a fun one.
Intel gifted it to us when it was first published. Back when large employers still valued their employees happiness, blah, blah, blah...

IIRC, Intel worked with the author directly to make the book happen? Memory is fuzzy.
I think everything in the book took place within the space of 24 hours, somewhere on the globe. So it very much is a time capsule from that day.

I count at least 6 scopes in that picture.

Always willing to help. Sell and even loan out extenders I have on hand. Prototype something special you might need.

John "Sparky" Nery
3 Springer Ave.
Tiverton, RI 02878

WA1ESO@... WA1ESO(AT)JUNO(DOT)COM

401-624-4576

Phone call between 8A and 8P East Coast time only please

The book was a collection of photos taken on 11 July 1997 -all round the world. More info here-

I think that's a std 13 amp UK type plug and plug board on the ground - the racks are on a computer floor but not tied down-they are on an angle that is not lined up with the floor tiles and have horizontal steadying bars on the bottom. Looks like whatever it is was shifted there from elsewhere.
DaveB, NZ

Check that all socketed transistors are well seated. My 503 had a dropout
that was corrected by pushing a transistor back into the socket. If I
recall, the component in question was near the front of the instrument.

Dave Casey

I think the modules in the racks look a bit too complex to be digital modules. Perhaps its not a digital computer but an analogue one?

cheers
Martin

On Tue, Jul 27, 2021 at 7:55 AM Dave Peterson via groups.io
<davidpinsf@...> wrote:

Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book:



And inside found:

/g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0

How many Tek Scopes can you find? Any guesses what they're working on? And any chance anyone knows who is in the picture?

Interesting picture. It looks like they're working on a
valve/tube-based computer of some sort, and there's an odd mixture of
technology in use. What look like mid-1980s PCs with 500 series scopes
as well as a 453 (or 454) and various 465s or similar. I'd guess it's
a restoration project of some sort but I can't identify the computer.

Chris

From Tim P (UK)
Early computers, such as Colossus, EDVAC, EDSAC, Whirlwind etc. were built
on open relay racks. I wonder if the photo shows a reconstruction, or
'working model' of an early machine. Any guesses on the date from the
'scopes and PCs in use ?
Tim



On Tue, 27 Jul 2021 at 07:12, cheater cheater <cheater00social@...>
wrote:

Great find. Few pictures of these actually performing their job in a
real environment.

On Tue, Jul 27, 2021 at 7:55 AM Dave Peterson via groups.io
<davidpinsf@...> wrote:

Hi All,

Thought folks might be entertained by this picture I found. Currently

helping my wife with downsizing her mothers household. Came across this
book:

And inside found:

/g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0

How many Tek Scopes can you find? Any guesses what they're working on?

And any chance anyone knows who is in the picture?

There wasn't any specific information on the picture in the book. The

subject was more general computers in technology. The book is currently on
a slow boat back home, so I might be able to do more research once I'm able
to dig it back out.

Dave