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The IBM 1401
1
Transcript
The IBM 1401
Restoration Process
Thanks for listening! :)
Use of the 1401
- over 20, 000 hours, mostly by volunteers
- project headed by retired IBM engineers
- biggest challenge was the corrosion of the transistors from exposure
- other concerns included faulty SMS circuit cards and refabrication of many of the internal moving parts
- worked for years on a machine brought in from Germany when they got a call that offered them another 1401 from Connecticut
- The Connecticut model was up and running in six months
< 2^ 328 as a number
2^328 in words >
^ printer connected to the 1401
- originally built to process data stored on punch cards
- small snippets of code that signaled certain behaviors(i.e. 008015 started a word
- most of the logic circuitry was a type of diode-transistor logic which is no longer widely used
- COOL FUN FACT: There is a punch card that has instructions to print HELLO WORLD.
History
THE IBM 1401
- Monthly rental started at US$2,500 (about $20,225 today)
- IBM received 5,200 orders in just the first five weeks
- over 10,000 installed in mid-1960s
- Commonly used as their primary data processing machines
- Two systems have been restored at the Computer History Museum
- stores up to 16,000 bytes
- powered by 12,000 watts, which is enough to power 9 average households
- weighs 900 pounds
- does 3,000 additions per second
- has 10, 600 transistors as compared to a TV or radio, which have 30 and 5
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