Editing VSE (operating system) (section)

==Overview==
DOS/360 originally used [[24-bit computing|24-bit]] addressing. As the underlying hardware evolved, VSE/ESA acquired [[31-bit computing|31-bit]] addressing capability.<ref name=Ent24.64>{{cite web  |website=EnterpriseSystemsMedia.com
|url=http://enterprisesystemsmedia.com/article/virtual-addressing-with-z-vse-from-24-bit-to-64-bit
|title=Virtual Addressing With z/VSE: From 24-Bit to 64-Bit
|author=Ingolf Salm  |date=May 7, 2012}}</ref>

IBM released z/VSE Version 4, which requires [[64-bit computing|64-bit]] [[z/Architecture]] hardware and can use 64-bit real mode addressing, in 2007. With z/VSE 5.1 (available since 2011)<ref name=Ent24.64/> z/VSE introduced 64-bit virtual addressing and memory objects (chunks of virtual storage), that are allocated above 2&nbsp;GB.