Dell 610 manual ERDUGDQG0RXVH&RQQHFWRUV

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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

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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.

APS/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.H\ERDUGthe mouse&RQQHFWRUdata 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.

B-12Dell Precision 610 Mini Tower Systems User’s Guide