Comment: Not true

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Not true

Device drivers almost always do things at the binary level.
For example, I am upgrading my treadmill to adjust incline based on my heartrate. Because I cannot get the necessary documentation from the now defunct manufacturer I need to replace the CPU with one I am able to program.

Part of this programming involves driving the LED displays on the control panel. These 8 segment and 8x8 DMDs are all driven by several 74xxx ttl logic ICs. Guess what 'code' I need to output to these circuits to light up the proper LED segments?