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Mainframe, System 390

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Beginners, Glossary and Background

The S/390 is a range of mainframe computers from IBM, which they refer to as large servers. The new S/390 G6 Enterprise Server is claimed by IBM to be the world's most powerful commercial enterprise server.

S/390 servers can run OS/390, VM/ESA, and VSE/ESA operating systems and TPF.

OS/390 is the most commonly used operating system on the S/390. It evolved from MVS , the mainstay of large commercial systems.

VSE/ESA and VM/ESA are aimed at the Medium-Sized Enterprise (MSE) sector. VM/ESA is particularly suited to network computing and interactive environments.

TPF (Transaction Processing Facility) is used for high volume transaction processing by airlines, hotel chains, health providers, travel agencies and the financial services industry.

The P/390 is a card that contains the S/390 instruction set that allows a PC to run OS/390, MVS, VM/ESA and VSE/ESA . The IBM PC Server System/390 contains a P/390 and is known as a pygmy mainframe. It allows applications to be developed and tested on a small and low cost machine, for later use on a more powerful machine. Because it can isolated from the mainframe and have its clock set to any date, it is particularly suited to Year 2000 testing.

See also: IBM's s390 pages


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24 October, 2000
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