The keyboard will connect to the computer, so can’t the mouse piggy back on that wire by plugging in through the keyboard?
Edit: Turns out I just never knew they exist all over the place. Thanks! Learning a lot of cool new keyboard features out there.
Back in the PS/2 days, mouse passthrough wasn’t all the uncommon.
These days, there are tons of keyboards with USB ports on the back of the keyboard. They’re usually not very fast or support fast charging, but they’re fine for plugging in a mouse.
Fancy keyboards even include multiple USB C ports!
Many people are just going wireless instead, though.
During the PS-2 era Apple was using the very similar ADB plug for input devices. It was standard on Macs of the era to have ADB passthrough on the keyboards. I can’t even recall any old Macs having two ADB ports.
When they switched to USB the passthrough came with it.
I don’t recall ever seeing PS-2 passthrough, as standard.