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Table 2914

Call driver "get I/O character counts" function with:
	AH = 05h
	AL = port number (00h-0Fh)
	interrupts disabled
Return: CF clear if successful
	    BX = number of bytes pending transmission
	    CX = number of bytes available for reading
	CF set on error
	interrupts disabled
SeeAlso: #02912,#02913

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