Computer connector pinouts
The reason I put this collection of pinouts on the web was because I always find myself needing to know what pin is what on a variety of computer ports, and sometimes the information just isn't as readily available as you might think. A simple Google search for USB pinout for example will bring in several dozen possibilities, most of which are correct but vary greatly in readability, and a few that are just plain wrong. This can be annoying when it's a brand new $200 motherboard you just set fire to by using the wrong connections... (yes, this can happen).. IF you find any errors on this page, PLEASE notify me here or if you don't like web forms, contact me at 
. The whole point of this is to be USEFUL, and if an error crept in I want to know so I can fix it, thanks:-) Even if you don't find an error, please let me know if you found the page useful:-)
List o' pinouts
PS/2 (6 pin MiniDIN) Keyboard / mouse
PC/AT (5 pin DIN) Keyboard
VGA (Monitor) HD-15
USB Type A (host) connector
PC Printer Port (DB-25)
PC Serial Port (DB-9)
PC Serial Port (DB-25)
PS/2 (6 pin MiniDIN) Keyboard/Mouse connector
 | Socket View |
 | Plug View |
| Pin # | | Function |
| 1 | | Data |
| 2 | | Reserved |
| 3 | | Ground |
| 4 | | +5 volt |
| 5 | | Clock |
| 6 | | Reserved |
PC/AT (5 pin DIN) Keyboard connector
 | Socket View |
 | Plug View |
| Pin # | | Function |
| 1 | | Clock |
| 2 | | Data |
| 3 | | Keyboard Reset (not used) |
| 4 | | Ground |
| 5 | | +5 volt |
VGA (monitor) HD-15 connector
 | Socket View |
 | Plug View |
| Pin # | | Function |
| Pin # | | Function |
| 1 | | Red Video |
| 9 | | N/C |
| 2 | | Green Video |
| 10 | | Digital Ground |
| 3 | | Blue Video |
| 11 | | ID0 |
| 4 | | ID2 |
| 12 | | ID1 or DDC Data |
| 5 | | Ground (Test) |
| 13 | | Horizontal Sync |
| 6 | | Red Video Ground |
| 14 | | Vertical Sync |
| 7 | | Green Video Ground |
| 15 | | ID3 or DDC Clock |
| 8 | | Blue Video Ground |
| | |
USB Type 'A' (host) connector
 | Socket View |
 | Plug View |
| Pin # | Wire color | Function |
| 1 | Red | +5 volt |
| 2 | White | - Data |
| 3 | Green | + Data |
| 4 | Black | Ground |
PC Parallel Printer port connector
 | Socket View |
 | Plug View |
| Pin # | | Function | | Pin # | | Function |
| 1 | | /Strobe | | 14 |
| /Auto Feed XT |
| 2 | | D0 | | 15 |
| /Error |
| 3 | | D1 | | 16 |
| /Init |
| 4 | | D2 | | 17 |
| /Select In |
| 5 | | D3 | | 18 |
| Ground |
| 6 | | D4 | | 19 |
| Ground |
| 7 | | D5 | | 20 |
| Ground |
| 8 | | D6 | | 21 |
| Ground |
| 9 | | D7 | | 22 |
| Ground |
| 10 | | /Ack | | 23 |
| Ground |
| 11 | | Busy | | 24 |
| Ground |
| 12 | | Paper Out | | 25 |
| Ground |
| 13 | | Select | | |
| |
PC Serial port connector (DB9)
 | Socket View
|
 | Plug View |
| Pin # | | Function |
| 1 | | NC |
| 2 | | TXD |
| 3 | | RXD |
| 4 | | DTR |
| 5 | | Ground |
| 6 | | DSR |
| 7 | | RTS |
| 8 | | CTS |
| 9 | | NC |
PC Serial port connector (DB25)
| Socket View |
| Plug View |
| Pin # | | Function | | Pin # | | Function |
| 1 | | NC | | 14 |
| NC |
| 2 | | TXD | | 15 |
| NC |
| 3 | | RXD | | 16 |
| NC |
| 4 | | RTS | | 17 |
| NC |
| 5 | | CTS | | 18 |
| NC |
| 6 | | DSR | | 19 |
| NC |
| 7 | | Ground | | 20 |
| DTR |
| 8 | | DCD | | 21 |
| NC |
| 9 | | NC | | 22 |
| RI |
| 10 | | NC | | 23 |
| NC |
| 11 | | NC | | 24 |
| NC |
| 12 | | NC | | 25 |
| NC |
| 13 | | NC | | |
| |
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Last Modified 2005-11-18
