INT 21 - DOS Internal - READ DEVICE AVAILABILITY

Input

 DOS1 N DOS2 Y

DOS3

 N DOS5 N

Output

AX

 37h 02h   FFh = Error AX

BX

         BX

CX

         CX

DX

       Device Flag DX

ES:DI

     CF 
Device Flag:    0    = /DEV/ must precede device names
                Else = /DEV/ not required


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