University of Michigan Executive System

This article is about UMES, the computer operating system. For the university, see University of Maryland Eastern Shore.

University of Michigan Executive System (UMES)
DeveloperUniversity of Michigan
Written inAssembly language
Working stateDiscontinued
Initial release1958; 66 years ago (1958)
Available inEnglish
PlatformsIBM 704, IBM 709, IBM 7090
Preceded byGM-NAA I/O
Succeeded byMichigan Terminal System
History of IBM mainframe operating systems
Early mainframe computer OSes
Miscellaneous S/360 line OSes
DOS/360 and successors (1966)
OS/360 and successors (1966)
VM line
TPF line
UNIX and Unix-like

The University of Michigan Executive System, or UMES, a batch operating system developed at the University of Michigan in 1958, was widely used at many universities. Based on the General Motors Executive System for the IBM 701, UMES was revised to work on the mainframe computers in use at the University of Michigan during this time (IBM 704, 709, and 7090) and to work better for the small student jobs that were expected to be the primary work load at the university.

UMES was in use at the University of Michigan until 1967, when MTS was phased in to take advantage of the newer virtual memory time-sharing technology that became available on the IBM System/360 Model 67.