A data and signal interface for controlling the transfer of data and signals between a memory array and macro function such as that of a digital signal processor core. A distance separating the walls is variable in a portion adjacent the vent such that gas molecules are directed towards the vent imparting a greater probability of molecule egress than ingress such that deeper vacuum is developed without requiring getter material. Alternatively, the trough can be filled with just a foam or fibrous substance. A spool rotates on a common shaft with the reel and is wound with a flat tape which is attached to the door frame. A technique is described for automatically extracting switch specific commands and options as generated by a first system for use in populating data stores used in a second system for command generation. An image displayed by the three dimensional image presenting plate is apparently three dimensional due to the convex end of the space.