The S/390 series mainframes (from IBM) are extremely big and extremely black. Think TMA-1 black. A fully configured model weighs several tonnes and draws >> 100kW of power. Oh, and they can saturate OC-48 lines rather easily.

I'd love to have one in my apartment, but the power bill would be nothing short of insane, and I doubt the floor (to say nothing of the air conditioner) could handle the load.

Undoubtedly the most complex invention of mankind's. The System 390 is a powerful computer that puts any other computer to shame. Easily capable of suporting multi-terrabytes of data, running jobs for hundreds of simultaneous users, System 390s are the only REAL computers.

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