VIDCLOCK - Get Installation State

Input

 DOS1 N DOS2 N

DOS3

 Y DOS5 Y

Output

AX

 B0h 00h   Install Flag AX

BX

         BX

CX

         CX

DX

         DX

ES:DI

     CF 
Install Flag:   00h = Not installed, OK to install
                01h = Not installed, not OK to install
                FFh = Installed


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