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How many computers are actually in Model S? From what I understand the instrument screen and the touchscreen basically acts as controllers to these other computers that perform specific tasks. How accurate is this?
Depends on what you consider a computer. There are a ridiculous amount of processors in the Model S. Not just the instrument panel and the touchscreen, but even things like the steering wheel buttons have a 16-bit ARM processor in them.
So the cpu count would basically identify the amount of "computers"? I guess all these systems are connected to the main computer (touchscreen) making them all firmware updatable.