Operating Systems History of Operating Systems(2) b 2 M emo Job 1 partitions Operating system Multiprogramming system H three jobs in memory -3ra generation Gao Haichang, Software School, Xidian University 13Operating Systems Gao Haichang , Software School, Xidian University 13 History of Operating Systems (2) Multiprogramming system  three jobs in memory – 3 rd generation