Amiga 590 Internal XT Connector

40-Pin IDC Male in Amiga 590 Hard Drive

Pin	Description	Pin	Description
1	/Reset	21	n/c
2	Ground	22	Ground
3	Data 7	23	/I/O Write
4	Ground	24	Ground
5	Data 6	25	/I/O Read
6	Ground	26	Ground
7	Data 5	27	/Data-Ack
8	Ground	28	Ground
9	Data 4	29	/Data-Req
10	Ground	30	Ground
11	Data 3	31	Int
12	Ground	32	Ground
13	Data 2	33	Address 0
14	Ground	34	n/c
15	Data 1	35	Address 1
16	Ground	36	Disk Address 1
17	Data 0	37	/Select
18	n/c	38	Ground
19	Ground	39	n/c
20	Ground	40	Ground

Source: Amiga 590 Service Manual