Simultaneous key presses can cancel each other out.

Created by: modeler

When using keyboard input (standard RetroPad configuration) to emulate the joystick, quick movements e.g. left / right can cancel each other altogether. If for example the left and right arrow keys are held simultaneously for a split second during frantic gameplay, the core appears to stop reading input until both keys are released. Physical controllers with a D-pad work perfectly since it is impossible to accidentally press left and right at the same time.

I don't know of any other libretro core that suffers from this. FS-UAE doesn't have this problem either, but I cannot test stand-alone P-UAE at the moment as I'm having issues getting it to build. I will update this issue when I have a yes / no answer on that.