Dell Precision 620 User Manual

Also see for Inspiron 620: Setup guide Upgrade manual System information guide Quick start Quick reference guide

Contents

Keyboard and Mouse Connectors OverviewYour system uses a Personal System/2 (PS/2)-style keyboard and supports a PS/2-compatible mouse. Cables from both devices attach to 6-pinminiature Deutsche Industrie Norm (DIN) connectors on the back panel of your computer. Either device can connect to either connector.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 andrelays the direction to the computer.Mouse driver software can give the mouse priority with the microprocessor by issuing IRQ12 whenever a new mouse movement is made. Thedriver software also passes along the mouse data to the application program that is in control.Keyboard ConnectorIf you reconfigure your hardware, you may need pin number and signal information for the keyboard connector. Figure 7 illustrates the pin numbersfor the keyboard connector, and Table 6 lists and defines the pin assignments and interface signals for the keyboard connector.Figure 7. Pin Numbers for the Keyboard ConnectorTable 6. Pin Assignments for the Keyboard Connector48 DPARL I/O SCSI data parity low49-50 GND N/A Signal ground51-52 TRMPWR N/A Terminator power53 RSVD N/A Reserved54 GND N/A Signal ground55 ATN I/O SCSI attention56 GND N/A Signal ground57 BSY I/O SCSI busy58 ACK I/O SCSI acknowledge59 RST I/O SCSI reset60 MSG I/O SCSI message61 SEL I/O SCSI select62 C/D I/O SCSI command/data63 REQ I/O SCSI request64 I/O I/O SCSI in/out65 D8 I/O SCSI data bit 866 D9 I/O SCSI data bit 967 D10 I/O SCSI data bit 1068 D11 I/O SCSI data bit 11Pin Signal I/O Definition1 KBDATA I/O Keyboard data2 NC N/A No connection3 GND N/A Signal ground4 FVcc N/A Fused supply voltage5 KBCLK I/O Keyboard clock6 NC N/A No connectionShell N/A N/A Chassis ground