INT 14 - SERIAL - WRITE CHARACTER TO PORT
AH = 01h
AL = character to write
DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)
Return: AH bit 7 clear if successful
AH bit 7 set on error
AH bits 6-0 = port status (see AH=03h)
SeeAlso: AH=0Bh"FOSSIL",AH=89h

See also: 1402

1401 - SERIAL - WRITE CHARACTER TO PORT