Copy II PC deluxe option board
        I/O     Jumper 6
                        up      up      268 - 26F (factory)
                        down    up      368 - 36F
                        up      down    2E8 - 2EF
                        down    down    3E8 - 3EF

        DMA     Jumper 6
                        up              DMA 1     (factory)
                        down            DMA 2     (Compaq)