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They sure needed a lot of resistors in that one!
That pullup must be pretty beefy then. Not actually Darlington?
I find the layout unusual, or I'm rather rusty on reading ICs; hard to tell what's collector and emitter. And hard to see the diffusions under the metal layer; they're only barely visible in the tilted (perspective? and look at that metal thickness, cool) view.
Another great one, thank you!