Microchannel Architecture (MCA) Bus Microchannel Architecture (MCA) Bus MCA Bus was developed by IBM to help solve the difference between a fast microprocessor and a relatively slow ISA bus. Although MCA bus does not accept ISA motherboard, its 32-bit interface is faster than ISA, which can better meet the requirements of 80386 and 80486 microprocessors. The MCA bus is designed as a single bus, and the transmission of the memory and the input/output (I/O) interface is handled by using a multiplexer. The multiplexer divides the bus into several different channels, and each channel can handle different processing requirements. Although this design is not as fast as the multi-bus design, it can meet the server requirements of medium-sized networks in most cases. If you run a centralized microprocessor application on a server, it may be wise to choose a super server because it has super throughput and multiprocessor capabilities. MAC is protected by patents and licensing agreements, which limits it from becoming a standard. In addition, IBM has imposed some restrictions on MCA to prevent competition with its small computer system. For these reasons, many manufacturers use Extended Industry Standard Architecture (EISA) or develop special bus standards.