Z80 Parallel Input/Output Controller

Z 80 PIO	Pin	Use	Pin	Use	Pin	Use	Pin	Use
	1	D2	11	GND	21	B RDY	31	PORT B4
	2	D7	12	PORT A3	22	INT ENABLE OUT	32	PORT B5
	3	D6	13	PORT A2	23	*INT	33	PORT B6
	4	*CHIP ENABLE	14	PORT A1	24	INT ENABLE IN	34	PORT B7
	5	CONTROL/DATA SEL	15	PORT A0	25	CLOCK INPUT	35	*RD
	6	PORT B/A SEL	16	*A STB	26	+ 5V POWER	36	*IORQ
	7	PORT A7	17	*B STB	27	PORT B0	37	*M1
	8	PORT A6	18	A RDY	28	PORT B1	38	D5
	9	PORT A5	19	D0	29	PORT B2	39	D4
	10	PORT A4	20	D1	30	PORT B3	40	D3