The KR1804VU4 microcircuits are a 12-bit micro-command address control circuit and are designed to generate a ROM address of micro-commands with a capacity of up to 4 kb words as part of microprogram control devices. Perform 16 microinstructions, which determine one of the five ways of generating the address: provide the following address by building the previous one by 1, repeatedly repeating the same address; conditional or unconditional transfer to the address contained either in one of the internal sources or located at the address input; conditional or unconditional transition to the subroutine; organization of cycles. They have a 12-bit address output, control inputs, a 12-bit address input, which is used to enter the starting address of the subroutine or the jump address.