When Sperry Rand replaced the plated wire memory with semiconductor memory, the same machine was released as the UNIVAC 1100/40. In this new naming convention, the final digit represented the number of CPUs in the system. The 1100/40 utilized a new Main Memory cabinet, replacing the 8K plated wire memory modules with 16K static RAM modules (based on 1024x1-bit static RAM chips), for a total of 131K per cabinet. This allowed expansion of the Main Memory to a maximum of 524K. As with the 1110, the 1100/40 CAU had four base and limit registers, so a program could access four 64k banks. New instructions were added to allow a program to change the contents of the banks, rather than the banks being fixed when the program was prepared