The laptop model of the MegaDuck (Super Quique / Hartung Super Junior) uses an external gamepad in the shape of a computer mouse. This document has pinout and wiring diagram sufficient to make a replacement.
The gamepad/mouse uses a 6 pin DIN connector.
The following cable from Kraydad has a suitable connector. The cable wire colors may differ from the OEM ones and should always be checked to ensure which color maps to which pin.
8 x 1N4148 Signal Diodes
The wiring for the buttons resembles what is used for Game Boy DMG and MGB models with two sets of buttons sharing common wiring and a method to select which set is being read.