The game use a native resolution of 256x240, so it looks a bit crappy on PS1.
I played the Arcade version and obviously had no problems whatsoever, besides having better graphics.
I believe that to adapt it to the PS1 version, the compromises were many.
It could be some kind of problematic VSync.

Hi Shendo and thanks for replying! Ok, I understand everything perfectly. With my Memcarduino, I noticed that the original Memory cards are read without any problem while for those of third parties, I noticed slowdowns in both reading and writing. From what I could deduce, the matter stems from the ...

Hello everyone!
I am writing because I need a little clarification:
In the Shendo diagram, you don't see any kind of resistor to plug into Arduino's RST and D9 pin.
What would they be for? They're necessary?
Thank you and I apologize for the inconvenience.