Abstract: A dust containment apparatus includes a housing that includes an opening and defines an internal volume. A housing seal is provided along an edge of the opening for sealing the housing against a work surface to be engaged with the housing. At least two hand ports are provided in the housing for receiving a user's hands. At least one of the hand ports includes a deformable hand port seal for at least partially sealing against the user's arm or hand when inserted through the hand port into the internal volume. The deformable hand port seal includes an aperture formed therein for allowing the user's hand to access the internal volume.

Abstract: Apparatus for storing all logic simulation signal values generated by a logic simulator during a simulation run is provided. The apparatus includes a runtime array for storing a plurality of signal values for each time instance in a predetermined time period, and a checkpoint cache for selectively storing the plurality of signal values stored in the runtime array at selected time instances. A hyper-checkpoint array is further provided to checkpoint the signal values in the checkpoint cache. In addition, the time instances and values of memory writes are also checkpointed. A user may retrieve the value of any signal values generated during the simulation run and may additionally rewind the simulator to a user-specified time in the simulation run.