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Maintenance & Service Guide
Presario Series
Models: 1246, 1247, 1277, 1278, and 1279
Home Page Notice Preface Product Description Troubleshooting Illustrated Parts Catalog Removal & Replacement Procedures Specifications Pin Assignments Battery Pack Operations
Connector Pin Assignments
This section provides connector pin assignment tables for Compaq Presario Series 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 | Signal Ground |
* = Active low
| Serial Connector |
Connector | Pin Signal |
1 Carrier Detect
2 Receive Data
3 Transmit Data
4 Data Terminal Ready
5 Signal Ground
6 Data Set Ready
7 Ready to Send
8 Clear to Send
9 Ring Indicator
Keyboard/Mouse
Connector | Pin | Signal |
| 1 | Data 1 |
| 2 | Data 2 |
| 3 | Ground |
| 4 | +5 V |
| 5 | Clock 1 |
| 6 | Clock 2 |
External VGA Monitor
Connector | Pin | Signal |
| 1 | Red Analog |
| 2 | Green Analog |
| 3 | Blue Analog |
| 4 | Not connected |
| 5 | Ground |
| 6 | Ground Analog |
| 7 | Ground Analog |
| 8 | Ground Analog |
| 9 | Not connected |
| 10 | Ground |
| 11 | Monitor Detect |
| 12 | DDC2B Data |
| 13 | Horizontal Sync |
| 14 | Vertical Sync |
| 15 | DDC2B Clock |
Universal Serial Bus
Connector | Pin | Signal |
| 1 | +5V |
| 2 | Data - |
|
|
Data +
3
4
Ground
| Modem |
|
Connector | Pin | Signal |
| 1 | Unused |
| 2 | Unused |
| 3 | Tip |
| 4 | Ring |
| 5 | Unused |
| 6 | Unused |