This Logisim project is designed to showcase a microprogram that utilizes a sequence of microinstructions stored in a read-only memory (ROM). The project demonstrates how the ROM words are permanently set during the hardware production process and contain control variables that the control unit accesses through successive read operations. The control unit executes the corresponding microinstruction specified by the content of the ROM word at a specific address. Once the control unit is in operation, the microprogram does not require any alterations. The Logisim project provides an interactive platform to simulate the execution of the microprogram and observe its behavior