All information on this page was taken from: http://www.geocities.co.jp/SiliconValley-SanJose/6808/ and http://www.pipitan.com/x68.html
It is a graphics accelerator & PCM sound board for X68000 manufactured by Ninety-nine Electric Ltd (九十九電機(株)). The board has 2MB VRAM which allows X68000 to display Truecolor and it can play PCM sound in 48/44.1/32/24/22.05KHz mono or stereo. This board was manufactured to expand the graphics display capabilities and to provide CD-quality sound playback.
|①||RGB OUT||Connect to the monitor|
|②||RGB IN||Connect to the RGB output which comes from X68000|
|③||PCM sound source LINEOUT||PCM sound output. Connect to amplifier, etc..|