Eisa
Compared to the ISA bus, EISA is extended to 32 bits and allows multiple CPUs to share the bus. The bus mastering support is also enhanced to enable access to 4 GB of memory. It can also accept older XT and ISA boards, compared to the MCA. EISA was also more favored by manufacturers due to the proprietary nature of MCA; even IBM made machines that supported it. However, it was unpopular with most desktop PCs because of its cost....