000     8237A-5    Channel 0 address register
 001     8237A-5    Channel 0 Word count
 002     8237A-5    Channel 1 Address register
 003     8237A-5    Channel 1 Word count
 004     8237A-5    Channel 2 address register
 005     8237A-5    Channel 2 Word count
 006     8237A-5    Channel 3 address register
 007     8237A-5    Channel 3 Word count
 008     8237A-5    Status/Command register (channel 0-3)
 009     8237A-5    Request register
 00A     8237A-5    Mask register (channel 0-3)
 00B     8237A-5    Mode register (channel 0-3)
 00C     8237A-5    Clear LSB/MSB flip/flop
 00D     8237A-5    Master Clear/Temporary Register
 00E     8237A-5    Clear Mask Register (channel 0-3)
 00F     8237A-5    Multiple Mask Register (channel 0-3)
 010     8237A-5    POST Routine
 018     PS/2       Extended Function Register (Write)
 02A     PS/2       Extended Function Execute
 020     8259A      Command Port
 021     8259A      Interrupt Mask Register
 040     8253-5     Channel 0
 041     8253-5     Channel 1
 042     8253-5     Channel 2
 043     8253-5     Mode Control
 060-R   8255A-5    Port A Input
 061     8255A-5    Port B
 062-R   8255A-5    Port C Input
 063     8255A-5    Mode Control Register
 070     PS/2       CMOS RAM address register and NMI mask
 071     PS/2       CMOS RAM Data Register
 081     DMA        Page Register (channel 2)
 082     DMA        Page Register (channel 3)
 083     DMA        Page Register (channel 1)
 087     DMA        Page Register (channel 0)
 089     PS/2-DMA   Page Register (channel 6)
 08A     PS/2-DMA   Page Register (channel 7)
 08B     PS/2-DMA   Page Register (channel 5)
 08F     PS/2-DMA   Page Register (channel 4)
 092     PS/2       System Control Port A
 0A0     NMI Mask   RAM Parity and Channel Error NMI Mask
 0C2     DMA Ch. 3  Select Device to be attatched to DMA Channel 3
 201     Game controller
 2E8     COM4       Transmit/Receive buffer or baud rate divisor LSB
 2E9     COM4       Interrupt enable register or baud rate divisor MSB
 2EA     COM4       Interrupt identification register
 2EB     COM4       Line control register
 2EC     COM4       Modem control register
 2ED     COM4       Line status register
 2EE     COM4       Modem status register
 2EF     COM4       Scratch pad register
 2F8     COM2       Transmit/Receive buffer or baud rate divisor LSB
 2F9     COM2       Interrupt enable register or baud rate divisor MSB
 2FA     COM2       Interrupt identification register
 2FB     COM2       Line control register
 2FC     COM2       Modem control register
 2FD     COM2       Line status register
 2FE     COM2       Modem status register
 2FF     COM2       Scratch pad register
 3B4-W   Mono/VGA   Index register
 3B5     Mono/VGA   Data register
 3B8     Mono/VGA   Mode control register
 3B9     Mono/VGA   Color select
 3BA-W   Mono/VGA   Feature Control Register
 3BA-R   Mono/VGA   Status register
 3BB     Mono       Clear Light Pen latch
 3C0-W   VGA        Attribute controller registers (write)
 3C1-R   VGA        Attribute controller registers (read)
 3C2-W   VGA        Miscellaneous Output Register
 3C2-R   VGA        Input Status Register 0
 3C3     VGA        Video Subsystem Enable Register
 3C4     VGA        Sequencer Index Register
 3C5     VGA        Sequencer Data Register
 3CA-R   VGA        Feature Control Register
 3CC-R   VGA        Miscellaneous Output register (Read address)
 3CE     VGA        Graphics Controller Index Register
 3CF     VGA        Graphics Controller Data Register
 3D4-W   Color/VGA  Index register
 3D5     Color/VGA  Data register
 3D8     Color/VGA  Mode control register
 3D9     Color/VGA  Color select register
 3DA-W   Color/VGA  Feature Control Register
 3DA-R   Color/VGA  Input Status register 1
 3DB     Color      Clear Light Pen latch
 3DC     Color      Preset Light Pen latch
 3E8     COM3       Transmit/Receive buffer or baud rate divisor LSB
 3E9     COM3       Interrupt enable register or baud rate divisor MSB
 3EA     COM3       Interrupt identification register
 3EB     COM3       Line control register
 3EC     COM3       Modem control register
 3ED     COM3       Line status register
 3EE     COM3       Modem status register
 3EF     COM3       Scratch pad register
 3F8     COM1       Transmit/Receive buffer or baud rate divisor LSB
 3F9     COM1       Interrupt enable register or baud rate divisor MSB
 3FA     COM1       Interrupt identification register
 3FB     COM1       Line control register
 3FC     COM1       Modem control register
 3FD     COM1       Line status register
 3FE     COM1       Modem status register
 3FF     COM1       Scratch pad register