Onboard Sound Pro; Sound And Game (On The Externals Connectors) - Intel 440BX Manual

Hardware Setup

Onboard Sound Pro

Sound and Game (on the Externals
Connectors)
This connector provides Line-IN, MIC (Microphone),
Line-Out (Speaker) signals for audio I/O, and Game Port
(which is also used as the Joystick/MIDI port) signals.
21
Side View
Game (15-pin Female)