Midrange computers were once called minicomputers. They have capacities in between desktop and mainframe computers, and sizes between a 19" color TV and a large refrigerator. Historical firms in this market were Data General, Digital Equipment Corp. (DEC), IBM, Prime. Compaq (via DEC merger) and IBM now dominate this market. Compaq (via DEC merger) makes and sells VMS, IBM makes and sells OS/400. Compaq bought and merged with DEC a few years ago and acquired VMS.