USB Keyboards & Mice
The Replay2 base board initially will be able to accept hardwired keyboards and mice.
Apart from this, the Replay2 will support now or in the future Wireless & Bluetooth dongles. See link for more.
The Replay2 baseboard should initially will be able to support usb joysticks.
Note: depending in firmware & cores etc this may or may not include all models of usb joysticks or and usb gamepads.
Serial to USB adaptors
Serial to usb adapters such as the Tom and Jerry & JP mouse / Rys MkII & MKIV Amiga USB etc should also work.
Note: Depending on firmware and or cores etc, these may or may not work until tested fully on the replay2 baseboard.