IBM announces the Model 705 computer

1st October 1954
IBM announces the Model 705 computer

The IBM 705 was a first-generation tube-based computer. It was announced on the 1st October, 1954, with deliveries in 1956.

The IBM 705 was the first commercial computer with core memory. The IBM 704 (announced in 1954) also had core memory, but was generally regarded as a scientific computer. The 705 succeeded the IBM 702, which used CRT memory.

The arithmetic unit in the IBM 705 used 1,700 vacuum tubes. It could multiply two 10 digit numbers in just 2.4 milliseconds.

IBM 705 was a character-oriented machine, with 7-bit characters and 35-bit words, with each word containing 5 characters. There were several different models of the IBM 705:

  • Model I had 20,000 characters of storage and cost around $590,000.
  • Model II had 40,000 characters of storage.
  • Model III had 80,000 characters of storage.

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IBM announces the Model 705 computer

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