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INT 14 - MultiDOS Plus - TRANSMIT CHARACTER
        AH = 21h
        AL = character to send
        DX = port number
Return: AH = status
            00h successful
            39h no DSR or CTS
            3Ch no DSR
            3Bh no CTS
            41h no such port
            42h monitor mode not active
            97h timed out
Note:   monitor mode must have been turned on with AH=24h before calling
SeeAlso: AH=22h"MultiDOS",AH=24h"MultiDOS"
See Also: 1420
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