From the article “Using Color Graphics and Widgets for the 32-Bit Experimenter” by Thomas Kibalo. (see April 2012 Nuts and Volts)
The carrier module provides a color LCD module serial interface capability for the 32 Bit experimenter. The carrier module supports sound generation, a multi-position (five) input switch capability, keyboard PS/2 interface and dual user controlled green and red Leds . Sound is done through an on-board audio amplifier and mini-speaker. The multi-position switch is a five input switch position with up, down, left, right and press position. The PS/2 interface supports interconnetion with a full AT 101 key keyboard.