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INT 14 - Digiboard DigiCHANNEL PC/X* - GET POINTER TO CH_KEY_RDY FLAG
        AH = 0Dh
        DX = port number (00h-03h) (04h-43h for XAPCM232.SYS)
Return: ES:BX -> CH_KEY_RDY flag

Values for CH_KEY_RDY flag:
 00h    receive buffer empty
 FFh    characters available
See Also: 140A
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