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MVS/XA stands for MVS/Extended Architecture. This was a version of z/OS, which supported 31-bit addressing. It was vailable only on the high-end 43xx, and 308x and later ranges, and was replaced by MVS/ESA, then OS/390 and later z/OS.

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Topics: MVS/XA, MVS/ESA, MVSN Colonial Militia, MVSN Original...

MVSMVS M ultiple V irtual S torage was the most commonly used operating system on the System/370 and System/390 IBM mainframe computers. It is unrelated to IBM's other mainframe operating system called VM/CMS. First released in 1974, MVS was later renamed by	MVS/XAMVS/XA stands for MVS/Extended Architecture. This was a version of z/OS, which supported 31-bit addressing. It was vailable only on the high-end 43xx, and 308x and later ranges, and was replaced by MVS/ESA, then OS/390 and later z/OS.	MVS/ESAMVS/ESA MVS Enterprise System Architecture. Version of MVS, first introduced as MVS/SP Version 3 in February 1988. Replaced by/renamed as OS/390 late 1995. MVS/ESA OpenEdition Version of MVS/ESA announced February 1993 with support for POSIX standards.
MVSN Colonial MilitiaMVSN Colonial Militia was based in Italian African colonial possessions of Libya and Italian East Africa comprising Eritrea, Ethiopia and Somalia. It consisted of seven Legions of militia recruited initially from Italian colonists and then from local Afri	MVSN original organizationMVSNOriginal Organization by Royal Decree on 1 February 1923 was as follows: 1st Zona Piemonte Hq Torino 1st Sabauda Torino 2d Alpina Torino 3rd Subalpina Cuneo 4th Marengo Allessandria 5th Valle Scrivia Tortona 11th Monferrato Casale 12th Monte Bianco Ao

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