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Two new concepts for computer development now being developed are design frames and system kits. The design frames take care of the details of interfacing new integrated circuits with a standard bus, and system kits provide a hardware and software standard for prototypes consisting of one or many design-frame-based circuit boards. A system kit starts with the basic prototyping hardware required to build a complete computer system: card cages, power supplies, memory boards, and so forth. These off-the-shelf parts are chosen so that they can work together through standard bus protocols, circuit-board form factors, and software conventions. The prototyping hardware is then augmented by design frames-a special interfacing technique for closely integrating custom chips and printed-circuit boards into the system.