Looking inside a 1970s PROM chip that stores data in microscopic fuses (2019)
Summary
This article analyzes the MMI 5300 PROM, a 1970s memory chip that stored 1024 bits using a 33x33 array of diodes and fuses. It covers how the data is programmed by selectively blowing Nichrome fuses, the die-level structure, address decoding, testing practices, and how PROM evolved to EPROM/EEPROM. It's a valuable read for hardware historians and engineers interested in memory technology and reverse engineering techniques.