DEC's name brand for its line of UNIX workstations. Built around the MIPS RISC processor.

a workstation that has some form of graphics display, keyboard and mouse

The DECstation was a brand of computers used by DEC, and refers to three distinct lines of computer systems—the first released in 1978 as a word processing system, and the latter (more widely known) two both released in 1989. These comprised a range of computer workstations based on the MIPS architecture and a range of PC compatibles. The MIPS-based workstations ran Ultrix, a DEC-proprietary version of UNIX.