INT 14 - Digiboard DigiCHANNEL PC/X* - WRITE STRING
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: 140F

140E - Digiboard DigiCHANNEL PC/X* - WRITE STRING