Was the first mainframe-based computer built on lamps or semiconductors? I know that the first PCs were on the lamps, but the mainframes ...

Closed due to the fact that off-topic by Nofate member ♦ Dec 19 '16 at 15:05 .

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The history of mainframes is considered to be from the IBM System / 360 . This is a third-generation computer, and there, as we know, integrated circuits have already been used.