color='#FF0000'>central processing unit. Mostek Z80 processor. ceramic package. Max clock frequency 4.0 MHz. color='#FF0000'>central processing unit. Mostek Z80 processor. ceramic package. Max clock frequency 2.5 MHz. color='#FF0000'>central processing unit. Mostek Z80 processor. Plastic package. Max clock frequency 2.5 MHz. color='#FF0000'>central processing unit. Mostek Z80 processor. Plastic package. Max clock frequency 4.0 MHz. Z80 PROcESSOR color='#FF0000'>central Processing Unit