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Maintenance & Service Guide
Presario 1800 Series
Models: 1825 and 1800T

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Pin Assignments
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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

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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

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Serial Connector

Connector Pin Signal
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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
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2

3

4

5

6

Data 1

Data 2

Ground

+5 V

Clock 1

Clock 2

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External VGA Monitor

Connector Pin Signal
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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

+5V

Ground

Monitor Detect

DDC2B Data

Horizontal Sync

Vertical Sync

DDC2B Clock

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Universal Serial Bus

Connector Pin Signal
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2

3

4

+5V

Data -

Data +

Ground

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Modem

Connector Pin Signal
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2

3

4

5

6

Unused

Tip

Ring

Unused

Unused

Unused

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TV Out

Connector Pin Signal
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2

3

Ground

Composite

Ground

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Game Port

Connector Pin Signal
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2

3

4

5

6

7

8

9

10

11

12

13

14

15

+5V

SWA

RBTA

GND

GND

RBTB

SWB

+5V

+5V

SWC

RBTC

RMSO

RBTD

SWD

RMSI

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S Video

Connector Pin Signal
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2

3

4

Ground

Ground

SYR

SCG

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Port Replicator Connector
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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 Indicator 37 Red 57 Joystick Data C 77 S-Video SYR
18 Serial Port  RXD 38 Ground 58 Joystick Data D 78 Ground
19 Serial Port RI 39 Composite TV Out 59 Switch A 79 S-Video SCG
20 Serial Port DTR 40 Not Connected 60 Switch B 80 Ground

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