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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
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