Any method to input numeric key to start msx game(ex. Athletic land)?


I’m really enjoying classic games such as MSX, genesis at Retroarch 1.7.5 installed on PS VITA.

But for some old MSX games such as Athletic land, Antarctic adventure, etc, numeric “1” or “3” should be pushed to start the game instead of SPACE BAR or Joystick “A” button. Even though I changed the input method from “Joystick” to “Joystick + Emulated keyboard” or “Emulated keyboard” during game pause, there is no method to input numeric “1” or “3”, but only “F1”, “F2”, … Please let me know other good method to input the numeric key to start the game at PS VITA.

Thank you.