Connection
| System | Connector | Pinout | Transmission Protocol | Command Strings | Image |
|---|---|---|---|---|---|
| PC | 5-pin DIN (DIN 41524) |
1 CLK 2 DATA |
2 start bits, 8 data bits, make/break bit (keydown/keyup), 1 stop bit keyboard reset via pin 3 to ground |
Not supported | |
| XT | 5-pin DIN (DIN 41524) "AT" connector |
1 CLK 2 DATA |
2 start bits, 8 data bits, make/break bit (keydown/keyup), 1 stop bit keyboard reset via sequence on DATA and CLK lines |
Not supported | |
| AT | 5-pin DIN (DIN 41524) "AT" connector |
1 CLK 2 DATA |
1 start bit, 8 data, 1 parity (odd), 1 stop bit keyboard reset via command string |
Supported | |
| PS/2 | 6-pin Mini-DIN (DIN 45322) "PS/2 connector" |
1 DATA 2 N/C (or MOUSE DATA) |
1 start bit, 8 data, 1 parity (odd), 1 stop bit keyboard reset via command string |
Supported | |
| Later PC compatibles |
4-pin USB Type A connector |
1 +5V 2 Data − |
sync field plus 8-bit bytes as packets (HANDSHAKE, TOKEN, DATA, Special packets), least-significant bit first. |
Supported |
Read more about this topic: IBM PC Keyboard
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—Ralph Waldo Emerson (1803–1882)