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Ostensibly the ability to run the old lunar navigation code explains where many of these chargers disappeared to.

Yes, 140W USB-C Power Adapter (A3607) has CYPD3135 controller which is based on 32-bit, 48-MHz Cortex M0 CPU with 2 times more RAM (8KB), 128 KB flash and around 500 to 1000 times higher performance.

How does it compare on IO? The normal blurbs rarely give a hard number but the AGC as a flight computer has to interface with quite a few devices. I found one thing that said it had 20 16-bit IO channels which would be well over 300 io pins.

A follow up question, I have never done anything with microcontrollers. How does one attach large amounts of IO to them? Common bus and everyone talks I2C? Multiplexer IC's?

Even that's probably way overkill.