CPC I/O - The Expansion Port

The expansion port (viewed from the rear of the computer)

1	SOUND	18	A0	35	INT*
2	GND	19	D7	36	NMI*
3	A15	20	D6	37	BUSRQ*
4	A14	21	D5	38	BUSAK*
5	A13	22	D4	39	READY
6	A12	23	D3	40	BUS RESET*
7	A11	24	D2	41	RESET*
8	A10	25	D1	42	ROMEN*
9	A9	26	D0	43	ROMDIS
10	A8	27	+5V	44	RAMRD*
11	A7	28	MREQ*	45	RAMDIS
12	A6	29	M1*	46	CURSOR
13	A5	30	RFSH*	47	L PEN
14	A4	31	IORQ*	48	EXP*
15	A3	32	RD*	49	GND
16	A2	33	WR*	50	CLOCK
17	A1	34	HALT*