Amstrad CPC is an 8-bit personal computer that was introduced to the market in 1984. It used to be sold in sets with a GTM640 color monitor or a monochrome GT65 green one. The computer was produced in several versions, however, all were based on the Zilog Z80 processor, clocked at 4MHz. The initial versions, marked with 464, were equipped with a cassette recorder and 64kB of RAM. The richest 6128 version had a 3 "floppy disk drive and 128kB operational memory.