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====== Int 21H, AH=44H, AL=04H ======

===== Version =====

2 and higher

===== Brief =====

READ FROM BLOCK DEVICE CONTROL CHANNEL

===== Family API =====


===== Input =====

	AX = 4404h
	BL = drive number (00h = default, 01h = A:, etc.)
	CX = number of bytes to read
	DS:DX -> buffer

===== Return =====

 CF clear if successful
	    AX = number of bytes actually read
	CF set on error
	    AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

===== Macro =====


===== Notes =====

	format of data is driver-specific
	this function was not supported by Digital Research's DOS Plus

===== See also =====

 AX=4402h"DOS 2+",AX=4405h"DOS",INT 2F/AX=122Bh

===== Note =====

Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]

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