EPROM dump is in the attachment. It starts in address space at 0xF800.

I've just bought it here. I'm looking for more detailed information about the board.

Does anyone know what it could be? It uses two Rockwell chips: 6502 and 6522. On the board are labels: "MPS 65-2", "THALER" and "85-1-1". The board was probably made in mid-eighties.