J1850: An automotive bus which takes two forms; A 41.6Kbps Pulse Width Modulated (PWM) two wire differential approach, or a 10.4Kbps Variable Pulse Width (VPW) single wire approach. The single wire approach may have a bus length up to 35 meters, with 32 nodes.

Joystick Interface: The Joystick port used with Personal Computers uses a 15pin D connector. The interface is normally found on sound cards and not off the motherboard.

JTAG Bus: A serial four wire test bus used to 'Boundary-Scan' IC's; at the chip level.

Interface bus links point to pages that describe the physical interface and electrical interfaces and includes vendors producing products. In many cases an interfacing protocol is not even mentioned. However connector styles, their pin outs or signal assignments and the electrical drive required by the interface is provided. These particular interfaces all use copper cable interfaces, although they could exist on a printed wiring board as well.