Abstract: A method and apparatus for developing a computer screen layout provides a plurality of physically manipulable pieces each representing one of a plurality of computer screen objects. The pieces are removably secured to a surface representing a computer screen. The pieces are arranged on the surface to provide a proposed computer screen layout. The pieces may then be moved on the surface, added to the surface, or removed from the surface to provide a revised computer screen layout. The revised computer screen layout is then recreated in the computer program under development.

Abstract: A data processing system and method having a number of cache controllers coupled to a bus. A cache controller uses a buffer operably coupled to the bus for loading information from the bus. A status bit associated with a buffer indicates the buffer status. The cache controller has logic circuitry operably coupled to the bus and the buffer. The logic circuitry responds to a certain cache coherency operation by loading the buffer and waiting during a predetermined interval for a possible retry signal before further processing the operation.