Accent kernel

Accent is an operating systemkernel, most notable for being the predecessor to the Mach kernel. Originally developed at Carnegie Mellon University (CMU), Accent was influenced by the Aleph kernel developed at the University of Rochester. Accent improves upon Aleph, fixing several problems and re-targeting hardware support for networks of workstation machines (specifically, the Three RiversPERQ) instead of minicomputers. Accent was part of the at CMU which ran from 1981 to 1985. Development of Accent led directly to the introduction of Mach, used in NeXTSTEP, GNU Hurd, and modern Apple operating systems including macOS and iOS.