Main

There are 2 modes for Atari joystick: 5-buttons (default) and 8-buttons. To switch between modes you have to press and keep red button on top together with 2 small black buttons, and while keeping them pressed, press the red button on the bottom. In Menu core you won't see any info, in other cores you will see info 8-buttons mode or 5-buttons mode. In 8-buttons mode you have to keep bottom red button pressed so other 4 buttons will generate secondary key codes. For MiSTer these 2 modes are like 2 completely different joysticks, so you have to define buttons in Menu core for both modes. 8-button mode is probably not so convenient, but it's better than nothing as some cores need more than 5 buttons. So you may assign ABXY as primary buttons and L/R/Sel/Start as secondary. 5-button mode should be enough for many cores and it's default mode.