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B-10 Dell Precision 210 Desktop 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
Industrie 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 microprocessor by issu-
ing 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-5 illustrates the pin numbers for the keyboard con-
nector, and Table B-5 lists and defines the pin assignments and interface signals for
the keyboard connector.
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
1
3
5
2
4
6
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