Slashdot Mirror
Big, Beautiful Boxes From Computer History
Slatterz writes "We might sometimes complain about the limitations of today's technology, but there's nothing like seeing photos of a 27Kg hard drive with a capacity of 5MB to put things into perspective. PC Authority has toured the Computer History Museum in California, and has posted these fascinating photos, including monster 27Kg and 60Kg drives, and a SAGE air-defense system. Each SAGE housed an A/N FSQ-7 computer, which had around 60,000 vacuum tubes. IBM constructed the hardware, and each computer occupied a huge amount of space. From its completion in 1954 it analyzed radar data in real-time, to provide a complete picture of US Airspace during the cold war. Other interesting photos and trivia include some giant early IBM disc platters, and pics of a curvaceous Cray-1 supercomputer, built in 1972. It was the fastest machine in the world until 1977 and an icon for decades. It cost a mere $6 million, and could perform at 160MFLOPS — which your phone can now comfortably manage."
Although these photos don't include the functional replica of Babbage's Difference Engine #2 that's currently at the museum, and leaves in a few months. I was just at the museum two weeks ago. It was pretty interesting. There's also an exhibit about the history of chess computation. Apart from those two things though, most of the museum is a big room full of old computers. I wish there were more to see there, but what is there is pretty interesting. I recommend going before the Babbage Engine leaves in a few months if one gets a chance.
I love BBW errr I mean BBB.
The highlight and centrepiece of the Museum - The Babbage Engine. It's a replica, made in the British Museum using the original as a template.
This is not a replica of an original. The machine in the British museum was built by a team using Babbage's note. No original was ever built, as Babbage could not get funding for the project. The machine at the Computer History Museum (as pictured) is the second built by the same British Museum team who built the first.
If you want to see it, it will be at the CHM until December 2010, at which time it will be moved to the home of Nathan Myhrvold, the person who paid for its construction.
-Todd
Omne ignotum pro magnifico.
Also, check out the keyboard on this beast! Not QUERTY. Not DVORAK. Who thought that would be a good idea?
That's a french Minitel terminal (their videotex system, see: http://en.wikipedia.org/wiki/Minitel). The telephone company gave people free terminals if they would forgo printed telephone books. Remeber, this was the early 80:s so there must have been enough people with less than stellar keyboard skills who'd rather peck away on a ABC-keyboard than hunt around on a AZERTY-keyboard if given the choice. But I'm pretty certain that most terminals had the french standard AZERTY keyboard (here's the Minitel 1 http://upload.wikimedia.org/wikipedia/commons/6/6d/Minitel_1.JPG )
***Each SAGE housed an A/N FSQ-7 computer, which had around 60,000 vacuum tubes. IBM constructed the hardware, and each computer occupied a huge amount of space.***
The sites had two computers, not one. The switched between them once a day so they could check all the vacuum tubes on the off line computer -- of which I'm pretty sure there were only about 6000. Mostly they were 6SN7 dual triodes so there were actually about 12000 switches in each computer. Memory was 68K by 32 bits wide, and software was continually swapped in from drums in the background. Instruction cycle time was 6 microseconds. The specs weren't vastly different from a 1980s IBM PC with 256K of memory.
The software was written in assembler and was speced to accept digitized radar from 16 sites, support 40 or 80 (can't remember which) consoles, track up to 300 aircraft simultaneously, control dozens of manned interceptors plus unmanned Bomarc interceptors, communicate with four or five adjacent sites digitally, and some number of manual sites via teletype, and some other things. And it actually did most of that. (I think it maxed out a little below 200 simultaneous tracks). Try THAT on a 8088
In general, the software -- which cost a fortune -- worked. Not perfectly, but better than Windows and Office.
And, yes, SAGE needed a lot of air conditioning. The lights in parts of Santa Monica used to dim momentarily when the air conditioning at the RAND System Reseach labs development facility started up.
*** It was a two story building***
It was a four story building. And the computers were on the second floor only. Another floor held something like 40 (80?)desk sized consoles -- each with a fairly large display, a light gun (closest thing today would be a mouse), and a button panel. Other floors held offices, Telco equipment, etc. The consoles were used to monitor target tracking, control interceptors, etc. There were also a half dozen or so regional command centers -- also with AN/FSQ7s that were configured a bit differently.
You can't see ANYTHING from a car, You've got to get out of the goddamned contraption and walk...Edward Abbey
As I understand it, a big reason why Enigma was succesfully broken is because some of it's users kept using the same "keys" for it.
Had the germans used the Enigma how it was meant to be used, it might not have been broken at the time.
They (the code breakers) could also use "known plain text" attacks quite a lot. Many operators tended to use the same greeting phrase over and over again. In addition, the Germans sent their weather reports encrypted. The British Navy could easily check the weather and get even more "known plain text".
For a nice date: Call strftime(3C)!
Noooo!!!!
Colossus was developed for breaking cryptographic material (Fish) from Lorenz telex style stream ciphering machines (Tunny). Enigma was broken by the Bombes which were more mechanical in nature.
All quite clear if you visit Bletchley Park in the UK, the rather lower budget British museum of cryptography and computing. Both the Colossus and Bombe reconstruction projects were run out of BP and if are lucky you can get a talk on their operation from Tony Sale or one of the other builders.
See my journal, I write things there
Oddly enough, there apparently are some people that still use them. The train ticketing, phone book, and a number of other services are still up and in use.
Not odd at all considering the various threats of Internet, from spam to virus, credit cards frauds, DoS etc. Minitel pretty much insure that whomever you phone is legit provided you don't misstype the phone number. It's a very helpful and desirable feature for some sensitive businesses (chemist ordering prescription drugs, etc.)
And thanks to being a passive terminal, Minitel is immune to virus and trojans by nature. Being so simple, there are no bugs either I'm aware off. And being text only makes for a great bonus to blinds who can plug whatever Braille device they want to use it.
It is simple fact that many cryptographic systems are uncrackable in the absence of all knowledge of how they work - but in the real world keys must be exchanged somehow, and encryption must always have a mechanism, and these are always potential vulnerabilities.
From scarped cliff or quarried stone she cries "A thousand types are gone, I care for nothing, no not one."
After figuring out how the machines worked, it became a simple matter to brute force the machines (try every combination) using mechanical means, ie the Bombes. This was simpler then it sounds because of some exploitable weaknesses (the same letter will never encryt to itself, the wiring in the disks wasn't changed, etc) The Bombes tried every possible combination of settings of an encoded message looking for the string "EIN" (German for one, Turring himself was said to have come up with this neat little hack) These possible decrypts were passed on to a human to check if the made sense. Remember that this was all done with a mechanical system. Late in the war, when the Germans were changing their codes every hour, this system was able to keep up.