Maintenance & Service Guide
Presario 1800 Series
Models: 1825 and 1800T
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Connector Pin Assignments
This section provides connector pin assignment tables for Compaq Presario 1800 Series Portable Computers. For more information on connectors, refer to the sections on Back Connectors and Port
Replicator 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
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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 |
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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 | +5V |
| 10 | Ground |
| 11 | Monitor Detect |
| 12 | DDC2B Data |
| 13 | Horizontal Sync |
| 14 | Vertical Sync |
| 15 | DDC2B Clock |
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Universal Serial Bus
Connector | Pin | Signal |
| 1 | +5V |
| 2 | Data - |
|
|
Data +
3
Ground
4
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| Modem |
|
Connector | Pin | Signal |
1Unused
2Tip
3Ring
4Unused
5Unused
6Unused
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| TV Out |
|
Connector | Pin | Signal |
1Ground
2Composite
3Ground
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| Game Port |
|
Connector | Pin | Signal |
1+5V
2SWA
3RBTA
4GND
5GND
6RBTB
7SWB
8+5V
9+5V
10SWC
11RBTC
12RMSO
13RBTD
14SWD
15RMSI
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| S Video |
|
Connector | Pin | Signal |
1Ground
2Ground
3SYR
4SCG
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Port Replicator Connector
Pin | Signal | Pin | Signal | Pin | Signal | Pin | Signal |
1 | Adapter Power | 21 | Serial Port CTS | 41 | Not Connected | 61 | Switch C |
2 | Adapter Power | 22 | Serial Port DCD | 42 | Power Cycle | 62 | Switch D |
3 | Adapter Power | 23 | Serial Port DSR | 43 | Keyboard Clock | 63 | MIDI Input |
4 | Adapter Power | 24 | Serial Port TXD | 44 | Keyboard Data | 64 | MIDI Output |
5 | Adapter Power | 25 | Serial Port RTS | 45 | Mouse Clock | 65 | Not Connected |
6 | Adapter Power | 26 | Monitor DDC | 46 | Mouse Data | 66 | USB Power |
7 | Not Connected | 27 | Monitor DDC | 47 | Lp Select | 67 | USB Power |
8 | Printer Data 0 | 28 | Monitor Indicator | 48 | Lp Paper End | 68 | USB Power |
9 | Printer Data 1 | 29 | V. SYNC | 49 | Lp Initialize | 69 | USB Power |
10 | Printer Data 2 | 30 | Ground | 50 | Lp Busy | 70 | USB A- |
11 | Printer Data 3 | 31 | H.SYNC | 51 | Lp Error | 71 | USB A+ |
12 | Printer Data 4 | 32 | Ground | 52 | Lp Acknowledge | 72 | USB B- |
13 | Printer Data 5 | 33 | Blue | 53 | Lp AutoFeed | 73 | USB B+ |
14 | Printer Data 6 | 34 | Ground | 54 | Lp Strobe | 74 | 5V |
15 | Printer Data 7 | 35 | Green | 55 | Joystick Data A | 75 | 5V |
16 | Lp Indicator | 36 | Ground | 56 | Joystick Data B | 76 | Not Connected |
17 | Port Replicator Dock | 37 | Red | 57 | Joystick Data C | 77 | |
| Indicator |
|
|
|
|
|
|
18 | Serial Port RXD | 38 | Ground | 58 | Joystick Data D | 78 | Ground |
19 | Serial Port RI | 39 | Composite TV Out | 59 | Switch A | 79 | |
20 | Serial Port DTR | 40 | Not Connected | 60 | Switch B | 80 | Ground |
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