Abstract: A case for electronic components of a computer has a base section and a central section hinged together along a pivot axis. The base section provides a base compartment for first electronic components and may rest on a support surface. The central section provides a central compartment for second electronic components and has a front face with a display panel. The hinge structure is positioned so that, in a closed position, the base section is folded against the back of the central section. In an open position, the central section is elevated at an angle to the support surface with the base section extending rearwardly of the pivot axis which is located proximately to the intersection of the top and front walls of the base section. A cover may be secured to cover the display, and this cover can include a keyboard input for the computer. The keyboard/cover may also be releasably securable to the base section.

Abstract: Separate memory management units are described for use with a central processing unit to separately control expanding stack and data memory portions within a single logical memory segment. The stack and data portions are prevented from expanding into each other by a break register which contains an address between the two memory portions and is updated as the stack and data memory portions expand and contract. The stack memory management unit only is enabled when a portion of the memory is addressed on one side of the break value while the data memory management unit only is utilized when the address is on the other side of the break value.