What keyboards do I need for these vintage PCs?

I picked up two old PCs that I want to test and, eventually, sell. Will need to buy keyboards for them, so trying to figure out the exact specs.

The 1st one seems to need some sort of 9-pin com keyboard. I read up a bit on vintage connectors but got confused by the alphabet soup of different types. What does this one need? And are there adapters that would allow me to connect a PS2 or a USB keyboard to it?

The 2nd one needs a kb with a round plug (sorry for the bad angle in the photo). What's the exact type? Again, are there adapters for those?

Thanks!