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The first electronic computer invented was the Atanasoff Berry Computer. It was a special purpose computer designed only to solve simultaneous equations of up to 29 variables. The central concepts common in modern computers that it embodied were:

  • Dynamic memory storage using refresh
  • Separation of arithmetic unit from memory unit
  • Binary twos-complement signed numbers

It was completed and operating in 1942. It was also the world's first vector/array processor, having a vector register length of 30 words 50 bits long and 2 vector registers. Vector registers are used in many supercomputers and high performance microprocessors to do the same operation on many different numbers at the same time.

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