How to build a midi connector?

Some computers or their sound cards have 15-pin D-subminiature connectors, called game ports, that can be used for MIDI IN/MIDI OUT. The connector supports both MIDI and analog joystick functions. Access to the MIDI signals is provided by a short adapter cable that converts the D-subminiature pinout into DIN connectors. The recommended method of connecting two 5-pin DIN cables to a 15-pin D-subminiature computer port can be found at the MIDI.org web site. The MIDI specification very conservatively states that the maximum distance MIDI can be transmitted is 15 meters (50 feet), but it can normally go much farther.