Looking at some of the analog areas which are less dense than the digital, it’s obvious that the device is made on a planarized process with three aluminum metal layers. The three metal layers show up as a light straw color, a darker brown, and another light straw color although it is easy to disambiguate metal 1 and 3 by depth of focus at high magnifications. A greenish layer is also visible below metal 1, likely polysilicon.
The IBM 801, 802, and 803 line of check proofers used what were fundamentally
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The crashed airplane. Credit: Wikimedia Commons
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