TOTHE EDITOR Computer clubs and education Editor: Ever since I stepped into the educa- tion world, in the quasi-position of technical consulting instructor, I have been impressed by Dr. Braun's ideas, energy, and accessibility. Therefore, I was certainly pleased to see him represented in your series on computer education. I do, however, have one comment concerning Dr. Braun's article, "Into the 80's with Microcomputer-Based Learning" (July 1980). As an early hob- byist, former president of the New York Amateur Computer Club, and initiating executive director of the Personal Com- puting Society, Inc., I must mention that computer clubs are characteristical- ly populated by adults, not children. While it is true that teachers, parents, all of us learn much from our students, the clubs are just now beginning to draw these young people, with their fresh ideas and viewpoint. Certainly, we need them. And they need us. The entire premise of computer clubs lies in the spirit that binds the members with enthusiasm, mutual interest, and therefore friend- ship. These are the most sharing, caring people I have ever known, anywhere. May I suggest that adult or youngster, technician or novice, you join your local club for support? In New York, we maintain a hot line to dispense information and record calls for assistance. The telephone number is (212) 864-4595. Of course, like so many other clubs, we are also attempting to establish a computerized bulletin board, but a high percentage of our members have no equipment and are with us just to learn-so voice communication re- mains essential. Call us. Join us. No matter what your age, sex, or technical experience. Abby Gelles New York City October 1980 Reader Service Number 3 0- Dynamic Parametric Analysis Using Model, Man and Machine We sell hybrid computers because the real-time dynamic modeling required for control-system synthesis often cannot be done any other way. Here's why: EAI hybrids comprise one or more parallel analog processors which are managed and enhanced by a digital computer. This unique architecture lets you: 1. Test assumptions by interfacing your mathematical model to the real world 2. Observe system effects as you adjust indi- vidual parameters 3. Vary the time domain to study a process in real, fast or slow time EAI hybrid computer systems are indispensable engineering tools at high-technology facilities world- wide. From locomotives to space shuttles, engineers simulate physical systems on an EAI computer, then run the model with control hardware and people in the loop-or synthesize experimental control sys- tems on the hybrid computer before moving on to expensive (and sometimes inflexible) real-world hardware. It's the optimal solution! Isn't it time you got the EAI hybrid advantage? Learn how a modern hybrid computer system can save both time and money in control-system development-and make you a hero in the pro- cess. Write or call EAI Dept. 30-290 and ask forour special control information package. E1?Electronc Associates, Inc. 185 Monmouth Parkway, West Long Branch, N.J. 07764 (201) 229-1100 @1980 EAI To be considered for publication, a letter to the editor must be accompanied by a statement giv- ing Computer permission to publish that letter.