AN/UYK-8

The AN/UYK-8 was a UNIVAC computer.

Development
In April 1967, UNIVAC received a contract from the U.S. Navy for design, development, testing and delivery of the AN/UYK-8 microelectronics computer for use with the AN/TYA-20.

The AN/UYK-8 was built to replace the CP-808 (Marine Corps air cooled AN/USQ-20 variant) in the Beach Relay Link-11 communication system, the AN/TYQ-3 in a AN/TYA-20

Technical
It used the same 30-bit words and instruction set as the AN/USQ-17 and AN/USQ-20 Naval Tactical Data System (NTDS) computers, built with "first generation integrated circuits". This made it about one quarter of the volume of the AN/USQ-20. It had two processors instead of just one.

Instructions were represented as 30-bit words, in the following format: f 6 bits   function code j 3 bits   jump condition designator k 3 bits   partial word designator b 3 bits   which seven index register to use (B0=non used) s 2 bits   which S (5bits) register to use S0,S1,S2,S3(P(17-13)) y 13 bits  operand address in memory memory address = Bb + Ss + y = 18 bit (262,144 words)

Numbers were represented as full 30-bit words. This also allowed for five 6-bit alphanumeric characters per word.

The main memory was increased to 262,144 words (256K words) of magnetic core memory.

The available processor registers were:
 * one 30-bit arithmetic (A) register.
 * a contiguous 30-bit Q register (total of 60 bits for the result of multiplication or the dividend in division).
 * seven 30-bit index (B) registers.