X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 33 - ms mouse

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INT 33 - MS MOUSE - DEFINE SCREEN REGION FOR UPDATING
        AX = 0010h
        CX,DX = X,Y coordinates of upper left corner
        SI,DI = X,Y coordinates of lower right corner
Note:   mouse cursor is hidden during updating, and needs to be explicitly
          turned on again

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