@tubetime one of my backburner projects is a simple Arduino-based USB to PS/2 adapter, initially to do some fun stuff with older PS/2 mice - do you have any good references or other examples for PS/2 comms that you could share? I had a look at the code for this and have a pretty good idea of what's happening (great comments!) but implementing something myself still feels a bit daunting.
@timixretroplays can't help you with the usb but you could look at the ps/2 code in my adapter: https://github.com/schlae/RS6KB/blob/main/RS6KB.ino