y mainframe is still important in finance and airline booking

Most profitable business in IBM is mainframe.


Q: why not yet replaced by newer technologies like java and unix?

A: actually mainframe can also run java and unix


Reason: extremely reliable. Decision-makers dare not touch them. It’s hard to recreate something so reliable. May take many years to demonstrate the reliability.

Reason: mainframe is improving too, as competing technologies improve.

Reason: Terminals (like ATM and airline booking terminals) are locked into IBM mainframe. They can’t work with newer servers. You must replace terminals along with mainframe.

Reason: mainframe processing power is still formidable.

Reason: IBM killed its mainframe competitors chiefly Hitachi.  I don’t know if this prolongs or shortens mainframe shelf-life.

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