49-50

GND

N/A

Signal ground

 

 

 

 

 

 

 

 

51-52

TRMPWR

N/A

Terminator power

 

 

 

 

 

 

 

 

53

RSVD

N/A

Reserved

 

 

 

 

 

 

 

 

54

GND

N/A

Signal ground

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

Keyboard and Mouse Connectors

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 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.

Keyboard Connector

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 connector, and Table B-6 lists and defines the pin assignments and interface signals for the keyboard connector.