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Use "mainframes" in a sentence
"It feels like there is a lot of waste in mainframes as some people are using them for frivolous reasons while other companies who really need them can’t afford them."
"Giant computers known as mainframes are making a comeback."
"During the early years of the Web, however, a hacker could attain national fame by breaking into mainframes, which is exactly what Kevin Mitnick did - he hacked his way into Motorola, Sun Microsystems and PacBell, and ended up eluding the FBI for years through stolen identities and other elaborate ruses until a dramatic final showdown."