Developed by Compaq, Digital Equipment Corp, IBM PC Co., Intel, Microsoft, NEC and Northern Telecom.
 (At the controller)
 (At the peripherals)
4 PIN ??? MALE at the controller.
4 PIN ??? FEMALE at the peripherals.
| Pin | Name | Description | 
|---|---|---|
| 1 | VCC | +5 VDC | 
| 2 | D- | Data - | 
| 3 | D+ | Data + | 
| 4 | GND | Ground |