Motorola Inc has finally issued a statement disagreeing with Concurrent Computer Corp’s contentions that multi-processing features of the 68040 microprocessor were deficient (CI No 1,629). According to Motorola’s Jim Reinhart the 68040 is the only microprocessor that implements a physical copy-back cache with hardware coherency support. The chip also fully supports the traditional write-through cache mode which can exist with copy-back mode on a page by page basis. In both respects, the device meets the original specification. Motorola has never shipped production versions without copyback.
