@mitu
Pi4 4GB
Official PSU
Latest retropie (just updated)
Latest Emulationstation (just updated)
As I already mentioned I had configured the controller (wireless PS3 controller) in Reicast manually.
It still did nothing other than launch the game.
I have since (last night) tried two different controllers (PS4 connected using an 8bitDo adaptor and a generic USB wired controller) and they both worked fine without being manually configured in Reicast all be it I couldn't exit the game (I suspect manual config in reicast will solve that)
So it would appear PS3 controllers are not compatable with Reicast despite being listed in the reicast config (my google of the issue did tend to throw up more ps3 controller issues than any other).
I will look into installing flycast
Thanks,