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

Input

DOS1 N DOS2 Y

DOS4

Y DOS5 Y

Output

AX

44h 02h Error Code AX

BX

 File Handle     BX

CX

 Bytes to Read     CX

 

        DX

DS:DX

Buffer Address Set if Error CF
See Also 44h/03h


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