$DE0B/56843/RR+11:  SilverSurfer: Line Control Register

   +----------+--------------------------------------------------------+
   | Bit  7   |   1 = Baud Rate Divisor Latch at $DE08 and $DE09       |
   | Bit  6   |   0 = turn Break off, 1 = force spacing Break State    |
   | Bit  5   |   Parity: 0 = disabled, 1 = enabled                    |
   | Bit  4   |   Parity: 0 = odd, 1 = even                            |
   | Bit  3   |   Parity: 0 = no parity, 1 = parity                    |
   | Bit  2   |   Stop Bits: 0 = 1, 1 = 1.5 or 2 (*)                   |
   | Bits 1+0 |   Word Length select: 00,01,10,11 = 5,6,7,8 bits/char. |
   +----------+--------------------------------------------------------+
   (*) Stop Bits are 1.5 for 5 bit words or 2 for 6, 7 or 8 bit words.