Pick an example to start it.
Keyboard and gamepad
Directions↑ ↓ ← →
Cross, CircleZ X
Square, TriangleA S
L1, R1Q W
L2, R21 2
Start, SelectEnter Backspace

A gamepad with the standard layout works as it is. On a touchscreen, a controller appears under the picture, and beside it in landscape.

BIOS

The examples boot with the OpenBIOS from PCSX-Redux (MIT license). You can use your own BIOS image instead. It stays in this browser.

Using OpenBIOS.

Console