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back to article Brit 2.5-tonne nuke calculator is World's Oldest Working Computer

Britain's hefty Harwell Dekatron is back in the Guinness Book of World Records after being recognised - for the second time - as the world's oldest working digital computer. The 2.5-tonne number-crunching goliath began life at the Atomic Energy Research Establishment in Harwell, Oxfordshire, in 1951, and put reliability over …

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Dekatron

Looked it up on Wikipedia. Want.

http://upload.wikimedia.org/wikipedia/commons/f/f7/Dekatron.gif

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Re: Dekatron

Agreed! I wonder if the light was necessary or they just knew how cool it would look.

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Re: Dekatron

The light is how it works.

It's essentially an array of neons and when one strikes, the voltage is too low for the others. An impulse causes the 'lit' segment to change to the next one.

Used to design things with these, rtl logic took quite a while to provide similar functionality.

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Re: Dekatron

BTW maybe a 'which side of the Atlantic' thing, but I have never, until now, seen it spelt with a 'k'.

For me it remains a decatron.

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Anonymous Coward

Re: Dekatron

> but I have never, until now, seen it spelt with a 'k'.

From wiki:

"Dekatron," now a generic trademark, was the brand name used by the British Ericsson Telephones Limited (ETL), of Beeston, Nottingham

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Dekatron tubes

wow...total 'Gerry Anderson' flashback to Space:1999 there for a moment.

Carry on. I'm ok now.

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Happy

Re: 'Gerry Anderson' flashback to Space:1999 there for a moment.'

Good man! Light a cigar in a high oxygen environment :-)

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Devil

Re: 'Gerry Anderson' flashback to Space:1999 there for a moment.'

I don't like smoking at all...

But I'd kind of like to see that.......

As apprentice "Makers of Boils" - we got force fed safety videos of dummies dressed in overall's, getting the dust blown off them with pure oxygen, from an oxygen aceteylene cutting torch....

Add a source of ignition...

Sort of impressive.

But not exactly "in the confines of an oxygen filled space capsule" effect, with the LOX bottles and lines in situ as well.

Satan - Oxygen lights my fire.

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Stop

"Those Specs In Full"

Yet no mention of processing capability.

I'm pretty curious, for one.

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Anonymous Coward

Re: "Those Specs In Full"

Isn't it around 0.0000000001Gflops?

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Re: "Those Specs In Full"

12 legumes per second apparantly. Only 4 norks a week though :(

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FAIL

BogoMIPS (or mBogoMIPS?)

We're interested.

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what did it calculate?

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Anonymous Coward

42

What was the question?

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Anonymous Coward

What is six multiplied by seven?

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what did it calculate?

I have it on good authority that it came up with "BOOBIES"

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FAIL

re: AC @16:24

Never read the book, have you? It's What do you get when you multiply six by nine.

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Joke

Re: re: AC @16:24

That's to obvious.

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Re: re: AC @16:24

No-one writes jokes in base 13.

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Still better speed...

than most versions of windows. :D

In all seriousness, they did a fantastic job of recovery and restoration to make sure an important machine is kept for future generations to enjoy and learn from.

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Happy

Now all you need to do is slap on a touch-screen and a really big battery, and Samsung have got the Galaxy Note III...

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and the suit from Apple will follow after a swift visit to the patent office. They'll be putting this new vacuum tubes tech in the iphone 6 to make it lighter ;-)

It's great to see it back up and running! I know it's very Beardy but theres something awesome about those old machines, they're not just beige boxes (ok Sun have made some nice kit in their time, but its all just boxes really), stuff with tubes and lights is just so 1970's scifi :-)

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Don't forget the tapes? You've got to have giant reel-to-reel tape recorders, or it ain't a proper computer!

I agree with you on the sheer excellent-ousity of getting it working again though.

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Headmaster

I hope that's punched metal tape your talking about son, non of that new fangled magnetic stuff.

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Pint

And if you talk to the people working on it,

They are immensely knowledgable and keen to share that knowledge.

The gentleman ("I know valves, not computers") who took time out to explain the machine and how it worked to my niece last year, then got her to step it through to demonstrate how it processed a calculation deserves my thanks. If there's been a bar handy, I'd have offered him a pint. Thank you Sir!

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Re: And if you talk to the people working on it,

There used to be a bar in the manor house. No idea if they are still licensed. Otherwise head out the main entrance, turn left on to Church Green Road and the Eight Belles is down the bottom on the right.

Dunno why I felt the need to tell you all that but it would be nice to think we could get the engineers / guides sloshed one by one on a daily basis :)

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Bletchley Park is awesome.

If you've not visited you should! It's a brilliant site with a lot of very interesting history and a total geek-gasam inducing collection of computers. :-)

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Re: Bletchley Park is awesome.

If all you want to do is visit the "geek-gasam inducing collection of computers", then you don't want to visit the Bletchley Park Trust as such as their tours cover the war time story (intersting as it is) but don't even include a visit to Colossus any more. What you want to do is visit "The National Museum of Computing" which is a separate museum located on the BP site.

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Anonymous Coward

Re: Bletchley Park is awesome.

Agree totally. It is a fantastic place to visit, especially for us gentlemen of a certain incoming middle youth age bracket. And the people there are so nice and knowledgeable.

The Computer Science Museum there run programming workshops for kids to play with BBC Micros etc... It works well because the machines so immediate. When asked 'how long does it take to start a BBC Micro so it's ready to use?' the guesses ranged from 5 minutes to half an hour (!). Instead: One flick of the power switch, half a second and one beep:

BBC Computer 32K

Acorn DFS

Basic

> rem The world starts here...

>

According to the guy I spoke with, the kids loved it.

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Pint

Yeah...

...but can it run Crysis?

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Re: Yeah...

At what frame rate?

Don't think it blends, though.

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Re: Yeah...

More likely it will crush the blender!

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Happy

I love it... after using computers to fight fascism in Europe, we British then use computing for our second highest priority: ensuring we have enough cups of tea and cake.

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Boffin

Lyons Electronic Office was a contemporary of this beastie, actually.

It lead eventually to a weird conversation I had in a job interview. The company's product was marketed as being so easy to use that even your mother could use it. Hmm. So in the interview I remarked on the obvious flaw with this line of "reasoning": my mother, in the 1960s, was a senior programmer for LEO (the company) on LEO III machines. Saying it was so easy even she could use it isn't really a strong message...

(Yes, I do know what was meant, which is why I said it to be read as teasing them slightly...)

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Anonymous Coward

did u get the job after your pedantry?

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Anonymous Coward

My mother uses weird white appliances that are adorned with indecipherable symbols, instead of text that clearly says "detergent here" or "spin cycle". She also knows Pascal, on account of a 1980's OU maths degree, but doesn't get on terribly well with modern office suites.

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Black Helicopters

sorry but that should read:

... after using computers to fight fascism and give half of Europe to the Bolsheviks, we British then ...

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Anonymous Coward

Re: sorry but that should read:

I think you will it was Roosevelt and co. who gave half of Europe to Stalin. They knew how many American deaths there would be if they advanced past Berlin, and decided it was politically unacceptable to have to explain to American mothers why their sons were dead when Hitler would have lost the war anyway.

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"did u get the job after your pedantry?"

I got an offer, but had a better one from somewhere else.

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How I survive on 1.5kW?

It would seem better than some reg hacks.

;)

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Interresting from the developmental standpoint

It's using dekatrons which are essentially counters. This hints that it may be based on counting registers, exactly as mechanical calculators did.

In fact there were some desktop calculators like the ANITA which were based on the same principle.

Essentially those calculators were advanced "adding" machines. You could only add to a register by making it count up a number of steps. Subtractions were made by adding complement numbers. So if you wanted to substract 1, you would add 999...999. You could also typically shift the number you wanted to add. So you could add a number times 10 for example. That makes multiplications fairly simple.

In fact on the mechanical machines you often had to do those steps manually.

I think this machine also shows an early approach to computing. It didn't matter that it was just as slow as a human. What mattered was that you could off load work. The computer, in the early days, was a monument to lazyness. People built computers because they couldn't be bothered to do manual computational work. It's much more fun to build a machine to do that sort of work for you, and much cooler, too. :)

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Re: Interresting from the developmental standpoint

> It's much more fun to build a machine to do that sort of work for you, and much cooler, too. :)

I think Douglas Adams said that he was the sort of person who would rather spend two days writing a program that would automate a task that would have taken him half an hour to do himself.

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britain brought american nukes because of a crap computer

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I'm fairly sure we built our own nukes, we just bought an American launch system for some of them.

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Mushroom

Baron Penney

There wouldn't be a US bomb without assistance from the Brits. Check out Baron Penney. A key part of the original US design team.

http://en.wikipedia.org/wiki/William_Penney,_Baron_Penney

Strange thing is I knew this guy when I was a kid. His wife used to babysit me and my sister at times. Or we'd go round for tea and cakes. I never knew his background until I saw a BBC documentary on the British Bomb. And there was Lady Penney talking about it... talk about jaw dropping!! Realising I personally knew someone involved with THE bomb certainly makes you think!! (Even more so now I read that Wiki article which shows Penney picked out the targets...)

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Actually we just brought the rockets.

And....now we make ALL of America's nukes. Hah, funny how things turn around.

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the documentries says britain brought rockets and warheads because of time and the new goverment canceled the projects or something along the lines

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You may be confusing warheads and MIRVS, I believe the nuclear non-proliferation pact prevents the US selling the UK nukes and they certainly hid behind it when we asked the information on the Manhattan project we'd been promised in exchange for taking part.

Certainly your claim does raise the question of what the fuck AWE Aldermaston has been doing for the last 62 years...

Although I wouldn't believe documentaries, they frequently get stuff wrong.

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its a history documentry, the british warhead was`nt 100% stable or something, and the blue streak rocket was`nt finished, so they brought some american rockets, and part of the deal was the warheads that had to be included..

trident nuclear weapons are american and made by lockhead or someone else

either way, i am not bothered, blame it all on a computer that would take 2 months for some physics math, and another 2 month with 1 simple mistake

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