Appendix B. SCSI Port Pinout
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## Appendix B. SCSI Port Pinout

This appendix provides SCSI port pinout information.

Table 2-1 shows the cable pinout assignments for the four differential SCSI ports.

Figure B-1. 68-Pin Connector

Table B-1. SCSI Port Pinout (Differential)

Pin | Assignment | Pin | Assignment
--- | --- | --- | ---
1 | +DB(12) | 35 | -DB(12)
2 | +DB(13) | 36 | -DB(13)
3 | +DB(14) | 37 | -DB(14)
4 | +DB(15) | 38 | -DB(15)
5 | +DPARH | 39 | -DPARH
6 | +Ground | 40 | -Ground
7 | +D0 | 41 | -D0
8 | +D1 | 42 | -D1
9 | +D2 | 43 | -D2
10 | +D3 | 44 | -D3
11 | +D4 | 45 | -D4
12 | +D5 | 46 | -D5
13 | +D6 | 47 | -D6
14 | +D7 | 48 | -D7
15 | +DPAR | 49 | -DPAR
16 | DIFFSENS | 50 | Ground
17 | TERMPWR | 51 | TERMPWR
18 | TERMPWR | 52 | TERMPWR
19 | Reserved | 53 | Reserved
20 | +ATN | 54 | -ATN
21 | Ground | 55 | Ground
22 | +BSY | 56 | -BSY
23 | +ACK | 57 | -ACK
24 | +RST | 58 | -RST
25 | +MSG | 59 | -MSG
26 | +SEL | 60 | -SEL
27 | +C/D | 61 | -C/D
28 | +REQ | 62 | -REQ
29 | +I/O | 63 | -I/O
30 | Ground | 64 | Ground
31 | +DB(8) | 65 | -DB(8)
32 | +DB(9) | 66 | -DB(9)
33 | +DB(10) | 67 | -DB(10)
34 | +DB(11) | 68 | -DB(11)

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Appendix A. Identifying Graphics Boards and the Ports and Modules on the Back of the Workstation |  | Appendix C. Care and Cleaning of the XIO Compression Connector