Int 14 Fn 0E  - Digiboard Digichannel PC/x* - Write String                 [S]

   AH = 0Eh
   CX = number of characters to write
   ES:BX -> string
   DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)

Return: AX = number of characters actually written
   ZF clear if successful
   ZF set on error

See Also: AH=0Fh"Digiboard"