OS 400 By Ztaaarrr 1988 V1R1 1988 V1R1M2 1989 V1R2 1990 V1R3 1991 V2R1 1992 V2R1M1 1992 V2R2 1993 V2R3 1994 V3R0M5 1994 V3R1 1995 V3R6 1996 V3R2 1996 V3R7 1997 V4R1 1998 V4R2 1998 V4R3 1999 V4R4 2000 V4R5 2001 V5R1 2002 V5R2 2004 V5R3 2006 V5R4 / 5.4 2008 V6R1 / 6.1 2009 6.1.1 2010 7.1 2014 7.2 2016 7.3 2019 7.4 2022 7.5