I have an Asrock B450M Pro4. I just installed Catalina on it and have it in a mostly useable state. There are some issues I need to resolve when I have more time.
I don't have airdrop/continuity/handoff because I don't have wifi/bluetooth hardware yet, but I don't anticipate too much issue with that. Power management/sleep don't work. USB 2 doesn't work, but USB 3 seems fine.
