(1) Using a desktop computer as a terminal to a mainframe. See 3270 emulator.
(2) An earlier expression that referred to all sizes of computers from small to large.
"micro to mainframe." YourDictionary, n.d. Web. 25 May 2018. <http://www.yourdictionary.com/micro-to-mainframe>.
micro to mainframe. (n.d.). Retrieved May 25th, 2018, from http://www.yourdictionary.com/micro-to-mainframe