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INT 14 - MultiDOS Plus IODRV - READ CHARACTER FROM PORT
        AH = 05h
        AL = timeout in seconds (00h = never)
Return: AL = status
            00h successful
                AH = character read
            01h read error
            02h timed out
            other modem status (CTS, DSR) changed
Note:   the port number is stored at offset BEh in the Task Control Block
SeeAlso: AH=04h"MultiDOS",AH=06h"MultiDOS",AH=22h"MultiDOS"
See Also: 1402
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