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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