Old SCSI to Normal SCSI pins

The convention used here is that the normal 50 pin, two-row cable starts at pin 1 on the upper left of the connector and goes to pin 25 before wrapping around:

 1 ... 25
26 ... 50

and the old style three-row connector starts at pin 1 and goes to pin 17 before wrapping around:

 1 ... 17
18 ... 33
34 ... 50

As usual, use this with the standard disclaimers, no warranty applies.

Normal two-row SCSI	Old three-row SCSI
1	1
2	18
3	35
4	3
5	20
6	37
7	5
8	22
9	39
10	7
11	24
12	41
13	9
14	26
15	43
16	11
17	28
18	45
19	13
20	30
21	47
22	15
23	32
24	49
25	17

26	34
27	2
28	19
29	36
30	4
31	21
32	38
33	6
34	23
35	40
36	8
37	25
38	42
39	10
40	27
41	44
42	12
43	29
44	46
45	14
46	31
47	48
48	16
49	33
50	50

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Supported Architectures

Normal two-row SCSI	Old three-row SCSI
1	1
2	18
3	35
4	3
5	20
6	37
7	5
8	22
9	39
10	7
11	24
12	41
13	9
14	26
15	43
16	11
17	28
18	45
19	13
20	30
21	47
22	15
23	32
24	49
25	17

26	34
27	2
28	19
29	36
30	4
31	21
32	38
33	6
34	23
35	40
36	8
37	25
38	42
39	10
40	27
41	44
42	12
43	29
44	46
45	14
46	31
47	48
48	16
49	33
50	50

Normal two-row SCSI	Old three-row SCSI
1	1
2	18
3	35
4	3
5	20
6	37
7	5
8	22
9	39
10	7
11	24
12	41
13	9
14	26
15	43
16	11
17	28
18	45
19	13
20	30
21	47
22	15
23	32
24	49
25	17

26	34
27	2
28	19
29	36
30	4
31	21
32	38
33	6
34	23
35	40
36	8
37	25
38	42
39	10
40	27
41	44
42	12
43	29
44	46
45	14
46	31
47	48
48	16
49	33
50	50

Normal two-row SCSI	Old three-row SCSI
1	1
2	18
3	35
4	3
5	20
6	37
7	5
8	22
9	39
10	7
11	24
12	41
13	9
14	26
15	43
16	11
17	28
18	45
19	13
20	30
21	47
22	15
23	32
24	49
25	17

26	34
27	2
28	19
29	36
30	4
31	21
32	38
33	6
34	23
35	40
36	8
37	25
38	42
39	10
40	27
41	44
42	12
43	29
44	46
45	14
46	31
47	48
48	16
49	33
50	50