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B-12 Dell Precision 610 Mini Tower Systems User’s Guide
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Your system uses a Personal System/2 (PS/2)-style keyboard and supports a PS/2-
compatible mouse. Cables from both devices attach to 6-pin miniature
Deutsche Indus-
trie Norm
(DIN) connectors on the back panel of your computer.
A PS/2-compatible mouse works identically to an industry-standard serial mouse or
bus mouse except that it has its own dedicated connector, which frees up both serial
ports and does not require an expansion card. Circuitry inside the mouse detects the
movement of a small ball and relays the direction to the computer.
Mouse driver software can give the mouse priority with the processor by issuing
IRQ12 whenever a new mouse movement is made. The driver software also passes
along the mouse data to the application program that is in control.
If you reconfigure your hardware, you may need pin number and signal information for
the keyboard connector. Figure B-6 illustrates the pin numbers for the keyboard con-
nector, and Table B-6 lists and defines the pin assignments and interface signals for
the keyboard connector.
55 ATN I/O SCSI attention
56 GND N/A Signal ground
57 BSY I/O SCSI busy
58 ACK I/O SCSI acknowledge
59 RST I/O SCSI reset
60 MSG I/O SCSI message
61 SEL I/O SCSI select
62 C/D I/O SCSI command/data
63 REQ I/O SCSI request
64 I/O I/O SCSI in/out
65 D8 I/O SCSI data bit 8
66 D9 I/O SCSI data bit 9
67 D10 I/O SCSI data bit 10
68 D11 I/O SCSI data bit 11