Delete comment from: Ken Shirriff's blog
This is an extremely informative article. As the MMI salesman in the 1970s who received these chips as samples and held on to them for eons, I was not aware of the geometries, testing difficulties, or yield estimates. I am so glad that Marc was able to get them into the hands of such an expert who articulated the complexities of bipolar PROM manufacturing in that era. There is an application note I retained that mentions how useful these smaller chips are for patches in firmware. It should be noted that the APPLE I used the tristate version of these chips and they are mentioned on the schematic as vendor but incorrectly using the O.C. part number if I'm remembering correctly.
Aug 2, 2019, 3:26:16 AM
Posted to Looking inside a 1970s PROM chip that stores data in microscopic fuses