Tech – Mainframe

Posts related to the mainframe world

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MVS

The Paging Process

29th October 2010 Rui Miguel Feio
In addition to the DAT hardware and the segment and page tables required for address translation, paging activity involves a number of system components to handle the movement of pages and several additional tables to keep track of the most current version of each page. To understand how paging works, […]
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Glossary

Frames, Pages and Slots

29th October 2010 Rui Miguel Feio
When a program is selected for execution, the system brings it into virtual storage, divides it into pages of 4 kilobytes (4K), and transfers the pages into real storage for execution. To the programmer, the entire program appears to occupy contiguous space in storage at all times. Actually, not all […]
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Glossary

Virtual Storage

28th October 2010 Rui Miguel Feio
Virtual Storage means that each running program can assume it has access to all of the storage defined by the architecture’s addressing scheme. The only limit is the number of bits in a storage address. This ability to use a large number of storage locations is important because a program […]
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Glossary

Physical Storage

28th October 2010 Rui Miguel Feio
Conceptually, mainframes and all other computers have two types of physical storage: – The physical storage located on the mainframe processor itself. This is called processor storage or real storage; think of it as memory for the mainframe. – The physical storage external to the mainframe, including storage on direct […]