INT 21 - DOS 2+ - IOCTL - READ BLOCK DEVICE CONTROL STRING

Input

 DOS1 N DOS2 Y

DOS4

 Y DOS5 Y

Output

AX

 44h 04h Bytes Read / Error Code AX

BX

   Drive (0=Def)     BX

CX

  Bytes to Read     CX
          DX

DS:DX

 Buffer Address Set if Error CF 
See Also 44h/05h


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