Intel next decided to build a microprocessor that relied on fewer support chips so that it would be more commercially viable. It launched in 1974 with 4,500 transistors, and the ability to address 64k bytes of memory. Early microcomputers, including the MITS Altair 8800, the Processor Technology SOL-20, and the IMSAI 8080 all relied upon the 8080, as well as the CP/M OS.