21. Both the flat-panel display unit and the communications business represent a small part of Micron's sales. 22. In addition, the helmet includes a Multi-Optics Display Unit ( MODU ) with wide-range spectral scanning capabilities. 23. Touch-sensitive Control-Display Units ( CDUs ) were evaluated for commercial aircraft flight decks in the early 1980s. 24. If there is a failure in the display unit , appropriate action is taken to stop the train. 25. A display device was usually either a data to a format compatible with the display unit 's circuitry. 26. The system used a light pen to draw on the screen of a 2250 Graphical Display Unit . 27. Upgrades include Raytheon s Center Display Unit , which replaces several analog flight instruments with a single digital display. 28. The unique components called the Control and Display Units ( CDU ) were built in the MITRE laboratory. 29. IIIB, which added the range corrected Type 184 display unit from the IIC models, but lacked roll stabilization. 30. The dot matrix display unit , now a mainstay, was first seen in a game called Checkpoint in 1990.