Maintenance
& Service Guide
Presario 305 Model
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Connector Pin Assignments
This appendix provides connector pin assignment tables for
Compaq Presario 305 Model Portable Computers. For more information on connectors, refer to
the section on Rear Connectors.
NOTE: The signals in all tables of this
appendix are considered active high unless otherwise indicated by an asterisk (*).
Parallel
Connector |

|
Pin |
Signal |
Pin |
Signal |
1 |
Strobe* |
10 |
Acknowledge* |
2 |
Data Bit 0 |
11 |
Busy |
3 |
Data Bit 1 |
12 |
Paper Out |
4 |
Data Bit 2 |
13 |
Select |
5 |
Data Bit 3 |
14 |
Auto Linefeed* |
6 |
Data Bit 4 |
15 |
Error* |
7 |
Data Bit 5 |
16 |
Initialize Printer* |
8 |
Data Bit 6 |
17 |
Select In* |
9 |
Data Bit 7 |
18-25 |
Signal Ground |
* =
Active low |
|
Serial Connector |
Connector |
Pin |
Signal |
 |
1
2
3
4
5
6
7
8
9 |
Carrier
Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Ready to Send
Clear to Send
Ring Indicator |
Keyboard/Mouse |
Connector |
Pin |
Signal |
 |
1
2
3
4
5
6 |
Data 1
Clock 2
Ground
+5 V
Clock 1
Data 2 |
|
External VGA Monitor |
Connector |
Pin |
Signal |
 |
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 |
Red Analog
Green Analog
Blue Analog
Not connected
Ground
Ground Analog
Ground Analog
Ground Analog
Not connected
Ground
Monitor Detect
DDC2B Data
Horizontal Sync
Vertical Sync
DDC2B Clock |
|
Modem |
Connector |
Pin |
Signal |
 |
1
2
3
4
5
6 |
Unused
Unused
Tip
Ring
Unused
Unused |
|
Universal Serial Bus |
Connector |
Pin |
Signal |
 |
1
2
3
4 |
+5V
Data -
Data +
Ground |