Personal Computer User Manual

B-10 Dell Precision 610 Mini Tower Systems User’s Guide
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The 68-pin external small computer system interface (SCSI) connector on the system
back panel supports external Ultra SCSI devices such as scanners, ZIP drives, and
optical drives.
If you reconfigure your hardware, you may need pin number and signal information for
the external SCSI connector. Figure B-5 illustrates the pin numbers for the external
SCSI connector, and Table B-5 lists and defines the pin assignments and interface sig-
nals for the external SCSI connector.
1 STB# I/O Strobe
2 PD0 I/O Printer data bit 0
3 PD1 I/O Printer data bit 1
4 PD2 I/O Printer data bit 2
5 PD3 I/O Printer data bit 3
6 PD4 I/O Printer data bit 4
7 PD5 I/O Printer data bit 5
8 PD6 I/O Printer data bit 6
9 PD7 I/O Printer data bit 7
10 ACK# I Acknowledge
11 BUSY I Busy
12 PE I Paper end
13 SLCT I Select
14 AFD# O Automatic feed
15 ERR# I Error
16 INIT# O Initialize printer
17 SLIN# O Select in
18–25 GND N/A Signal ground