Dell Precision 620 User Manual Page 72
- Page / 131
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Keyboard and Mouse Connectors Overview
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. 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 and
relays 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. 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 7 illustrates the pin numbers
for 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 Connector
Table 6. Pin Assignments for the Keyboard Connector
48
DPARL
I/O
SCSI data parity low
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
Pin
Signal
I/O
Definition
1
KBDATA
I/O
Keyboard data
2
NC
N/A
No connection
3
GND
N/A
Signal ground
4
FVcc
N/A
Fused supply voltage
5
KBCLK
I/O
Keyboard clock
6
NC
N/A
No connection
Shell
N/A
N/A
Chassis ground
- Notes, Notices, and Cautions 1
- Adjusting Volume 3
- Using Audio Utilities 4
- Installing Audio Drivers 4
- Backing Up Your Files 5
- Basic Checks 5
- Look and Listen 6
- System Setup 7
- Expansion Cards 9
- Adding Memory 11
- Microprocessor Upgrades 14
- SuprFreq Utility Program 16
- Replacing the System Battery 19
- International Dialing Codes 21
- Americas Contact Numbers 22
- Europe Contact Numbers 23
- Features 30
- Before You Start Testing 30
- Advanced Testing 31
- Connecting Drives 35
- Installing SCSI Devices 42
- Troubleshooting the Monitor 45
- Troubleshooting the Keyboard 45
- Troubleshooting the Mouse 45
- Troubleshooting I/O Ports 46
- Help Overview 48
- Contacting Dell 48
- System Board Labels 68
- I/O Ports and Connectors 69
- Interrupt Assignments 74
- Memory Allocations 75
- Technical Assistance 77
- Help Tools 77
- Problems With Your Order 78
- Product Information 78
- Before You Call 79
- Before You Begin 80
- Removing the Computer Cover 80
- Replacing the Computer Cover 81
- Inside Your Computer 83
- Troubleshooting the Battery 88
- Troubleshooting Drives 90
- System Features 92
- Front Panel 95
- Back Panel 96
- Getting Help 97
- System Messages 98
- System Beep Codes 102
- Warning Messages 103
- Diagnostics Messages 103
- Diagnostic LEDs 103
- SNMP Platform Event Traps 105
- User's Guide 106
- Configuring the NIC 107
- Reinstalling the NIC Driver 107
- Installing SCSI Drivers 110
- AC Power Recovery 111
- Asset Tag 111
- Auto Power On 111
- Boot Sequence 111
- CPU Information 112
- Integrated Devices 113
- Keyboard NumLock 114
- PCI IRQ Assignment 114
- Primary Video Controller 115
- System Time 118
- ZIP Floppy Support 118
- Overview 119
- Error Messages 119
- Input Errors 119
- Program Conflicts 120
- Memory Address Conflicts 120
- Microprocessor 121
- System Information 121
- Expansion Bus 121
- Ports and Connectors 122
- Graphics and Video 122
- Back to Contents Page 125
- Using System Setup 125
- System Setup Options 125
- Entering System Setup 126
- System Setup Screen 126
- System Setup Navigation Keys 127
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