Debug port
Encyclopedia
Debug port is a port
Computer port (hardware)
In computer hardware, a port serves as an interface between the computer and other computers or peripheral devices. Physically, a port is a specialized outlet on a piece of equipment to which a plug or cable connects...

 included in a device to simplify development and debugging, which is not necessary for normal functioning of it. Debug ports are usually not removed or disabled to avoid costs of design changes, and can be used by modders and hackers to get extra functionality.

Examples:
  • Ubiquitous JTAG ports on IC
    Integrated circuit
    An integrated circuit or monolithic integrated circuit is an electronic circuit manufactured by the patterned diffusion of trace elements into the surface of a thin substrate of semiconductor material...

    s.
  • Low Pin Count
    Low Pin Count
    The Low Pin Count bus, or LPC bus, is used on IBM-compatible personal computers to connect low-bandwidth devices to the CPU, such as the boot ROM and the "legacy" I/O devices . The "legacy" I/O devices usually include serial and parallel ports, PS/2 keyboard, PS/2 mouse, floppy disk controller...

     debug port on the original Xbox
    Xbox
    The Xbox is a sixth-generation video game console manufactured by Microsoft. It was released on November 15, 2001 in North America, February 22, 2002 in Japan, and March 14, 2002 in Australia and Europe and is the predecessor to the Xbox 360. It was Microsoft's first foray into the gaming console...

    , used by modders.
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