Int 14 Fn 04  - Digiboard Digichannel PC/x* - Change Baud Rate             [S]

   AH = 04h
   AL = initializing parameters
       bits 7-5 unused
       bits 4,3: parity (00 none, 01 odd, 11 even)
       bit 2: stop bits (0 = one, 1 = two)
       bits 1,0: data bits (00 = five, 01 = six, 10 = seven, 11 = eight)
   BX = baud rate
   DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)

Return: AH = status
       00h successful
       FFh error

See Also: AH=05h"Digiboard"