The Sharp MZ80B was a home computer from the MZ series that was marketed in Europe and Japan in 1979. The MZ80B for business use had a built-in cassette recorder for storing and reading programs and data, and a monochrome monitor that could display 25 lines of 40 characters. The operating system, which includes an interpreter for the BASIC programming language, was read from ROM during boot, but could be loaded from a cassette. The disadvantage of this was that it took several minutes to load, but it was advantageous that the machine started with a 'clean' memory, and could also load other operating systems (including CP/M).