AN/UYK-8

The AN/UYK-8 was a UNIVAC computer. 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, but could have 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=18bit(262144Words)

Numbers were represented as full 30-bit words, this 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.