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IBM 704
A large, scientific computer made by IBM and used by the largest commercial, government and educational institutions.
The IBM 704 had 36-bit memory words, 15-bit addresses and instructions with one address. A few index register instructions had the infamous 15-bit decrement field in addition to the 15-bit address.
The 704, and IBM 709 which had the same basic architecture, represented a substantial step forward from the IBM 650's {magnetic drum} storage as they provided random access at electronic speed to {core storage}, typically 32k words of 36 bits each.
[Or did the 704 actually come *before* the 650?]
A typical 700 series installation would be in a specially built room of perhaps 1000 to 2000 square feet, with cables running under a raised floor and substantial air conditioning. There might be up to eight magnetic tape transports, each about 3 x 3 x 6 feet, on one or two "channels." The 1/2 inch tape had seven tracks and moved at 150 inches per second,
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