DEC Prism
（重定向自MicroPRISM）
Prism is a 32-bit RISC instruction set architecture (ISA) developed by Digital Equipment Corporation (DEC). It was the final outcome of a number of DEC research projects from the 1982–85 time-frame, and was at the point of delivering silicon in 1988 when the management canceled the project. The next year work on the Alpha started, based heavily on the Prism design.