Weak drive means there’s a pull-up resistor and the port will drain itself. Strong drive means you’re going direct and the port won’t. Drive levels aside, this

Weak drive means there’s a pull-up resistor and the port will drain itself. Strong drive means you’re going direct and the port won’t. Drive levels aside, this is called tri-state in electronics: https://en.m.wikipedia.org/wiki/Three-state_logic https://en.m.wikipedia.org/wiki/Three-state_logic