The UNIVAC 1106 was introduced in December 1969 and was absolutely identical to the UNIVAC 1108, both physically and in instruction set. Like the 1108, it was multiprocessor capable, though it appears that it was never supplied with more than two CPUs, and did not support IOCs. In fact, the only difference between an 1108A CPU and an 1106 CPU was a couple of timing cards. In order to keep costs low, an 1106 CPU could be ordered with as few as four word channels. This meant that only three I/O channels were available for peripheral subsystems, as channel 15 (the highest-numbered channel) was always, in both 1106 and 1108 systems, dedicated to the operator's console. Early versions of the UNIVAC 1106 were simply half-speed UNIVAC 1108 systems. Later Sperry Univac used a different memory system which was inherently slower and cheaper than that of the UNIVAC 1108. Sperry Univac sold a total of 338 processors in 1106 systems.