IBM As 400 MainFrame PDF

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All of us know that IBM company provides Main frame!
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but don't know What is Main frame?
What programming language is used?
so here is the doc which is the copy of IBM AS 400 OS.

Attachment:

.pdf   IPT As400.pdf (Size: 891.04 KB / Downloads: 415)
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Interest-Involvement-Implementation
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Superb Post Bro..! +5 for U
Somesh - V+ Team Junior Moderator - Want for other subjects also? Arrow CLICK HERE
An intresting one .nice!
nesan, proud to be in V+ Team.