This is Zilog Z80 8-bit microprocessor that was manufactured by Zilog from July 1976 onwards. During the late 1970s and early 1980s Zilog Z80 was used in great number of business oriented machines with the CP/M operating system. Two well known examples of z80+cp/m business computers are the portable Osborne 1 and the Kayro series. Zilog Z280 has long been a popular microprocessor. The zilog Z80 has long been a popular microprocessor in embedded and microcontroller cores where it remains widespread use today. Here is ZILOG Z80 8-bit microprocessor wiring diagram which consists of gate array, keyboard, cassette PCB, cassette, 2 x 256k ROM, 2 x 64K DRAM, joysticks, keypad, etc.