NEBULA: A Digital Computer Using a 20 Mc Glass Delay Line Memory Oregon State University has designed and constructed a medium-speed serial digital computer using glass delay lines circulating at 22 Mc as memory. The design objectives as originally conceived in a special seminar were: (1) to be a research project in computer design; (2) to be usable as an educational machine;and (3) to have easily modifiable hardware for basic research in computer systems design. An unusual arrangement of information within the 22 Mc memory allows a simple interface with the 340 Kc arithmetic unit, which results in an effective zero latency time and provides possibilities for an associative memory. The arithmetic unit has a command structure similar to large parallel machines, and uses flip-flop arithmetic and control registers throughout. All hardware development has been aimed toward the concept of easy modification, elaborate console controls for effective man-machine interaction and low cost. CACM July, 1966 Boles, J. A. Rux, P. T. Weingarten Jr., F. W. CA660705 JB March 2, 1978 9:35 PM 1409 4 1409 1208 5 1409 1409 5 1409 1409 5 1409 1409 5 1409