adept-trackball/firmwares

What is "drag_scroll_click_and_hold" vs. "drag_scroll_toggle"?

Each directory contains a type of firmware. For "click_and_hold", the drag scroll functionality works by clicking and holding the drag scroll button.

For "toggle", the drag scroll functionality works by clicking to turn on the drag scroll, and clicking again to turn it off.

What is "semaphore_X"?

That is a notation of how sensitive the drag scroll is.

"semaphore_8" is the least sensitive drag scroll. That means, you'll have to move the ball more to scroll.

"semaphore_0" is the most sensitive drag scroll. That means, you'll have to move the ball less to scroll.