Abstract: A pull through FIFO memory structure consisting solely of latches and logic circuits wherein the FIFO structure includes an empty/full bit for determining whether each cell in the FIFO structure includes FIFO data. If a cell is identified as not containing FIFO data, then each previous cell's FIFO data will be advanced during a clock signal.

Abstract: A sofa-bed which has a base with a seat member, a back member, and a bed member. The sofa-bed has linkage which connects the seat and the back and bed members together. The seat, back and bed members can be moved between a sofa position and a bed position. In the sofa position the bed member is behind the back member and in the bed position the seat, back and bed members are essentially in the same plane. The linkage connects the seat, back and bed members to the base in a slidable relation. The linkage and the seat, back and bed members can be moved together as a single unit relative to the base.