Changes
/* Sega Controlers */
Those SMS standard controlers may be used alsmot unchanged on a CPC if the software allows to redefine controls.
The only change is that the button1 (button2 on CPC) is button 2 1 on SMS.
It seems the "Power" button on SMS controlers is used when the controler is fitted with AutoFire option (needs to be checked) or when using the Lightgun.