UNIVAC III
However the word size and instruction set were completely different; this presented significant difficulty as all programs had to be rewritten, so many customers switched to different vendors instead of upgrading existing UNIVACs.Memory was built in stacks of 29 planes of 4,096 cores: 25 for the data word, two for "modulo-3 check" bits, and two for spares.Operand addresses were determined by adding the contents of the selected base register and the 10-bit displacement field (m).Sperry Rand began shipment in June 1962 and produced 96 UNIVAC III systems.The operating systems(s) which were developed for the UNIVAC III's were called CHIEF, and BOSS.The assembly language was SALT.