OS/390 is an IBM operating system for the System/390 IBM mainframe computers. [1]

2004年7月31日 · OS/390 was replaced by z/OS along with the introduction of eserver, including a complete line of mainframes called zSeries 900, most notable for its 64-bit addressing and IRD. z/OS also runs on System/390 G5, G6 and Multiprise 3000 systems.

The IBM System/390 is a discontinued mainframe product family implementing ESA/390, the fifth generation of the System/360 instruction set architecture.The first computers to use the ESA/390 were the Enterprise System/9000 (ES/9000) family, which were introduced in 1990. These were followed by the 9672, Multiprise, and Integrated Server families of System/390 in 1994–1999, …

z/os and os/390 are both like versions of operating system in Mainframe and coming to AS/400(Application System 400) it can be said as sister consignee for MAINFRAME machine.. check these link for some more details

The operating system, OS/390, was introduced in late 1995 to provide a fully functional multiple virtual storage package. OS/390 improved the realizability, availability and serviceability for the operating system and reduced the time required for customers to test and deploy the operating system in their environments.

2003年11月11日 · With OS/390, you may order new levels of some products but not of others; instead, you order and install an entire set of products integrated into one functionally rich operating system. Once positioned on OS/390, you can receive new functions and levels approximately every six months.

OS/390 (program number 5645-001) is a software package that integrates selected MVS platform software products and features to create a fully enabled and functionally rich MVS/ESA operating system platform.

OS/390 V2R10.0 TSO/E REXX Reference, SC28-1975 OS/390 V2R9.0 TSO/E System Programming Command Reference , SC28-1972 OS/390 V2R10.0 MVS Planning: Operations , GC28-1760

OS/390 V2R10.0 JES3 Optional Feature (Discs 1,2)..... 136 OS/390 V2R10.0 Language Environment (Disc 1)..... 137 OS/390 V2R10.0 LANRES (Disc 1)..... 137 vi Booklet for OS/390 Collection, December 2001 . OS/390 V2R10.0 Messages and ...

Table 3. Related Products Books (continued) Title Order Number OS/390 Hardware Configuration Definition: User’s Guide SC28-1848 OS/390 Information Roadmap GC28-1727 OS/390 Information Transformation GC28-1985 OS/390 Introduction and Release Guide GC28-1725 OS/390 JES Commands Summary GX22-0041 OS/390 Licensed Program Specifications …