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The first commercial computers were punch card machines from Bull. Here you could stack punched cards on the second floor. IBM delivered these machines to Hitler so he could tally the Jews and round them up more effectively.

The IBM 360 and 370 had to be kept in special cool rooms, where air circulated in the floor and lead up to cool the computer, the disks and other peripherals such as printers and tape stations. In around 1985, the largest "mainframe" in the world held around 100GB of disk storage ' "DASD". It occupied a building, required huge cooling and carried a price tag of around $100 million.

The size of the first computers were limited by the human height - since wires had to be connected and stacks of cards was used to program them. Every bit of RAM memory was tiny iron cores that was magnetized. The enclosure for e.g. an Eniac, was typically about 8 x 6 feet and 6 feet tall - and operated from a "typewriter".

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