Panasonic Password Skipping Plug
The Panasonic Password Skipping Plug is an electrical connector that allows to bypass the BIOS password on certain Panasonic Toughbook computers. It requires a PS/2 connector (a port for an "old-school" keyboard or mouse) and a parallel port ("old-school" printer port).
From the service manual of Panasonic Toughbook CF-72 (Mark 1):
When "Enter password" is displayed, use "Password Skipping Plug" in order to skip the user password. 1) Connect the parallel plug to the parallel port. 2) Connect the PS/2 mouse plug to the mouse port. 3) Power on the computer. The wiring of the parallel plug is described below. Connect pins 2-5-6-8-11-13-15-18-19-20-21-22-23 to Shield GND (PS/2 mouse plug pin 3.) Connect pins 3-4-7-9-10-12 to VC5 (PS/2 mouse plug pin 4) with 4.7KW each.