EXHIBIT 21 QMS, INC. SUBSIDIARIES AND TRADE NAMES Unless indicated otherwise, each of the following is a wholly owned subsidiary of QMS, Inc. State or Other Jurisdiction of Other Names Under Which Legal Name of Subsidiary Incorporation Subsidiary Does Business QMS Circuits, Inc. Delaware QCI QMS Foreign Sales, U.S. Virgin Inc. Islands QMS Canada, Inc. Canada QMS Computer Products, Ltd. QCP Watson Computer Products, Inc. QMS Europe B.V. the Netherlands QMS International B.V. QMS B.V. QMS Ltd. *QMS New Zealand Limited New Zealand QMS Australia Pty. Ltd. Australia QMS Japan, Inc. Japan QMS Asia-Pacific, Inc. Delaware QMS EUROPE B.V. SUBSIDIARIES: QMS International GmbH West Germany *QMS Winterthur, A.G. Switzerland QMS S.A.R.L. France QMS (UK) Limited United Kingdom QMS Nordic AB Sweden AS OF DECEMBER 15, 1994 * Dissolved or in the process of dissolution as of September 1994