$DE08/56840/RR+8:   SilverSurfer: Receive/Transmit Buffer
                                   Baud Rate Divisor LSB

  Receive/Transmit Buffer    (if Bit 7 of $DE0B is 0)

  Baud Rate Divisor Low Byte (if Bit 7 of $DE0B is 1)

   Baud rate divisors can be calculated by taking the oscillating frequency
   (7,372,800) and dividing by the quantity of the desired baud rate times
   the UART clocking factor (16). Use the following formula (avoid 0!):

   Divisor = 7372800 / (BaudRate * 16)

   Examples:

    BaudRate     Divisor               BaudRate     Divisor
              dec.     hex.                      dec.     hex.

       300    1536    $0600              19200     24    $0018
       600     768    $0300              38400     12    $000c
      1200     384    $0180              57600      8    $0008
      1800     256    $0100             115200      4    $0004
      2400     192    $00c0             153600      3    $0003
      4800      96    $0060             230400      2    $0002
      9600      48    $0030             460800      1    $0001