Year Name Developer Systems
1984 AT&T Personal Computer 6300 DOS Release 2.0 AT&T ibm5170
1981 IBM Personal Computer DOS IBM ibm5170
1982 MS-DOS Microsoft ibm5150 apc myb3k mbc55x rainbow tandy2k x820ii p500 ibm5170 kontiki dmv pcd compis octopus pc9821
1985 Microsoft Windows Version 1.0 Microsoft apricot ibm5170 nimbus
1985 Multitasking MS-DOS Microsoft ibm5170
1986 SCO XENIX System V release 2.1.3 for i8086 SCO ibm5170