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Chapter 1
Overview
Controls, Ports, and LEDs
38
21 S21 (+ATN) 55 S55 (–ATN)
22 S22 56 S56
23 S23 (+BSY) 57 S57 (–BSY)
24 S24 (+ACK) 58 S58 (–ACK)
25 S25 (+RST) 59 S59 (–RST)
26 S26 (+MSG) 60 S60 (–MSG)
27 S27 (+SEL) 61 S61 (–SEL)
28 S28 (+C/D) 62 S62 (–C/D)
29 S29 (+REQ) 63 S63 (–REQ)
30 S30 (+I/O) 64 S64 (–I/O)
31 S31 (+DB 8) 65 S65 (–DB 8)
32 S32 (+DB 9) 66 S66 (–DB 9)
33 S33 (DB 10) 67 S67 (–DB 10)
34 S34 (DB 11) 68 S68 (–DB 11)
Table 1-13 SCSI Port Pinouts (Continued)
Pin Number Signal Description Pin Number Signal Description