Huh, sound interesting.
The motherboard does not seem to be anything special. Its a DFI G486VPB Rev 0A with a 486 DX2 66Mhz with 32meg of RAM.
The video card is a S3 to the Max 64.
It looked like it had a striped down version of DOS 5.0, with cd-rom driver.
Here is a photo of the other data east card. I think this must be a serial port or a game port for a joypad?