ver. 20170111

What is MVS?

MVS, which stands for Multiple Virtual Storage, is one of the oldest operating systems developed by IBM and distant relative of what we nowadays call DOS. MVS has its own programming language, JCL (Job Control Language). Three decades after MVS was created (1974), JCL is still heavily used. As a matter of fact, where I work some programmer still use JCL on a daily basis in the IBM z/VM system. Some of the applications where I work query VSAM files and third-party application handle screen scraping to replicate the screens and output to ASP or JSP. After over forty years, the mainframe computers are still king.

The following table shows the history of MVS as per the book Understanding Operating Systems (ISBN 9780534503536) by Ida Flynn.




Operating System

1964 IBM 360 OS/360
1967 IBM 360 OS/MFT (Multiprogramming with Fixed number Tasks)
1968 IBM 360 OS/MVT (Multiprogramming with Variable number Tasks)
1972 IBM 370 SVS (Single Virtual Storage)
OS/VS1 (Virtual Storage 1)
OS/VS2 (Virtual Storage 2)
1974 IBM 370 MVS (Multiple Virtual Storage)
1981 IBM 370 MVS/XA (MVS with Extended Architecture)
1985 IBM 370 MVS/ESA (MVS with Enterprise System Architecture)
1990 IBM 390 MVS/ESA
1996 IBM 390 OS/390 (Open Server 390)
2000 zSeries z/OS 64-bit
2004 zSeries IBM z/VM

If you are interested in experiencing a mainboxes, you can run OpenVMS by HP or FreeVMS in a VDI.

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On a side note, I never stop thinking and processing information all around me. As such, one of the subjects that attracts me most (aside from technology and music) is human behavior, not limited to psychology and ethos of the individual and masses. Hence I usually read, study and write essays of my own. From all possible authors in this field, some of my favorites are (in order of interest) Nietzsche, Levinas and Kant. As such, I have published two science fiction books, in which I include my opinion on religion, sociology, psychology, politics, manipulation of the masses, media, science and various technologies.

Under the Thelian Sky, ISBN
             9781494232283, ASIN B00GTQBY04

In Under the Thelian Sky, mankind did not originate on Earth, but rather on Mars. When Mars could no longer sustain life, mankind had to escape and colonized Earth. Many years later, a study was written about the survival of mankind in Mars and its struggle in Earth led by Doctor Ajidan Edejem. We proved to be a species that has survived wars, slavery and other forms of abuse. All the while, the government controlled by "them" wants to keep everything quiet and even kill him for telling others about the unavoidable doom. Years before the extinction of life in Mars, the Thelian society was perfect, yet corrupted. Life was easy, yet difficult if you were different. For every good person, like Ahila Keinj who found peace in The Faith, there were many willing to destroy it all for gain while "they" controlled the fate of many. At the end, an outsider simply known as Operative Logger 9C56 tries to fight "them" and stop "their" manipulation of history and mankind.

You can get Under the Thelian Sky exclusively at Amazon — available on print (ISBN 9781494232283) and e-book (ASIN B00GTQBY04).

In The Daydreamer, Robert James is a normal New Yorker who wakes up one morning unsure what had happened in his life. He is accused of killing the woman he has always loved, but he remembers three possible realities. Which reality could be true? Has he dreamed these realities, seen this events or taken part of these strange acts? Is he a killer or is he being framed? Perhaps he knows the killer better than anyone else without realizing it.


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