No, you are wrong. The emulator supports two more buttons, 'Start' and 'Select'. And let's not forget the four D-pad buttons either. So in all there are eight NES buttons implemented. And to my knowledge this is all that a NES console has (discounting power-off and/or hardware reset switches).Quote:
But this emulator just supports two button ( A and B ) or ( Turbo A and Turbo B).
Use of all those buttons is a requirement for proper playing of many NES games, and without them it would have been next to impossible to implement such RPG games as "Final Fantasy 3". (And I mean the real NES FF3, not the US-renamed FF6 release for SNES.) For such use I prefer a custom FCEU button layout with PS2 'Triangle' and 'Square' buttons used for NES 'Start' and 'Select', to better match common RPG menu usage in the PS1 Final Fantasy releases.
Some other games might use the Start/Select buttons as 'shift-like' buttons in combos with the 'A' and 'B' buttons to modify their meaning. And combos can of course also be used with the directional buttons. It's all up to the imagination of the game programmers.
Best regards: dlanor