6 inch silicon wafer - Unique early EEPROM technology research wafer

Description

The Electrically Erasable Read Only Memory (EEPROM) is so common today in our electronic devices that we can't imagine life without it. It is the primary holder of our photos, messages, and our apps. This was not always the case however and this is a relic is from it's development. The devices on this wafer are not commercial devices, but rather test devices for engineers that were working to perfect the technology.
From the old Dallas Semiconductor R&D center in north Texas. It's a rare piece of history from the early EEPROM pioneers. It is actually labeled on the silicon as an EEPROM test chip. With a microscope you can see many different individual memory cells and small arrays that all have labeled connection pads. I don't have many of these to sell and since it is a test wafer, I doubt that many were ever built.
Photos were taken under standard room lights and  are not color enhanced. Colors are caused by diffraction of light and will change dramatically depending on viewing angle and lighting conditions.
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Thanks for looking!