Combined mouse and trackball

A combined mouse and trackball having its control ball (15) extending past a cover (1). Cover (1) has neck hinges (5) so that it pivots in relation to an opposing cover (17). A cable (33) at the front communicates with the computer receiving the control signals from the ball. A switch (43) reverses the significance of front-to-back signals from the ball depending on whether an actuator (45) integral with cover (1) engages the switch. In the closed position of cover (1) the bottom of the device is flat and the ball is upward for use as a trackball. In the open position of cover (1) the device is formed into a mouse with front and rear surfaces (67,69) to support the ball for frictional movement on a table (71). Latch surfaces (25,57 and 25,65) hold the covers in the two positions until they are manually released.