PROGRAMMING_OF_PROM

Published:2009/7/3 4:22:00 Author:May | From:SeekIC

Simple circuit is effective for 82S23, DM8577, and 74188 PROMs.With DM8577, circuit changes logic 1s to 0s.With 82S23, 0s are changed to 1s. Set address switches for word to be programmed, set S1 to program position, set S3 to bit to be programmed, and push S2 momentarily (less than 0.5 s). To verify that bit has been programmed, return S1 to read position and observe LED.Supply can be three 6-V lantern batteries in series.-Ham Help, 73Magazine, April 1977, p 42.



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