Fun fact. The ADB Apple Desktop Bus connector had four pins. Power, ground, one for the power button, and one for all other functionality.
That’s daisy chained keyboards, mouses and drawing tablets. All data in one single pin. And one for the power button.
Fun fact. The ADB Apple Desktop Bus connector had four pins. Power, ground, one for the power button, and one for all other functionality. That’s daisy chained keyboards, mouses and drawing tablets. All data in one single pin. And one for the power button.