UNIVAC 1105

The UNIVAC 1105 was a followon computer to the UNIVAC 1103A introduced by Sperry Rand in 1958.

The UNIVAC 1105 had either 8,192 or 12,288 words of 36 bit magnetic core memory, in two or 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 UNIVAC 1105 used 21 types of vacuum tubes, 11 types of diodes, 10 types of transistors, and 3 types of cores.

A complete UNIVAC 1105 computer system required 160 Kw of power (175 KVA, 0.9 power factor) and an air conditioning unit for cooling input water with at least 35 tons capacity. The computer system weighed 63,753 lbs (floor loading 47 lbs/sq ft) and required a room 49 ft x 64 ft x 10 ft. The floor space for the computer was approximately 3,752 sq ft. The power, refrigeration and equipment room was approximately 2,450 sq ft.

Cost, price and rental rates

                                                   Monthly
                                       Cost        Rental
   Basic system, consisting of        $1,932,000   $33,060
   8,192 words Magnetic Core,
   16,384 words Magnetic Drum,
   Central Processor, Peripheral
   Control, and 16 UNISERVO II
   Additional Equipment
   4,096 Magnetic Core                  $195,000   $ 4,500
   16,384 Magnetic Drum                   60,000     1,500
   Floating Point                         65,000     1,545
   Uniservo II20,000                         450
   Card In-Output                         55,000     1,310
   High Speed Printer                    185,000     3,300

External links

• BRL REPORT N0. 1115 March 1961 by Martin H. Weik