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Univac 1103AThe UNIVAC 1103A or Univac Scientific was an upgraded version of the UNIVAC 1103 introduced by Sperry Rand in March, 1956. The UNIVAC 1103A had up to 12,288 words of 36 bit magnetic core memory, in one to three banks of 4,096 words each. Fixed-point numbers had a 1 bit sign and a 35 bit value, with negative values represented in one's complement format. Floating-point numbers had a 1 bit sign, an 8 bit characteristic, and a 27 bit mantissa. Instructions had a 6 bit operation code and two 15-bit operand addresses. The 1103A was contemporary to the IBM 704, which also employed vacuum tube logic, magnetic core memory, and hardware floating point.
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