Source: https://problemkaputt.de/psx-spx.htm Section: Nopsxemulationcontrols
No$psx Emulation Controls Below are hotkeys & controls for the no$psx emulator.
Emulation Hotkeys
ESC Stop Emulation (switch to debugger)
Keypad-Mul Reset
Keypad-Sub Same as ESC
Keypad-Add Whoosh (run as fast as possible)
Backspace Whoosh (run as fast as possible)
Mouse Controller Emulation (via Mouse)
Left-Mouse-Button --> Pass mouse to PSX Emulation
Middle-Mouse-Button --> Pass mouse to Operation System
ESC --> Pass mouse to Operation System
Lightguns (Namco GunCon, and Konami IRQ10) (via Mouse)
Mouse Position --> Lightgun Position
Left Button --> Lightgun Trigger
Middle Button --> Namco Button A (left), or Konami Start Button (left)
Right Button --> Namco Button B (right), or Konami Back Button (rear)
XXX Konami (IRQ10) Lightguns aren't working yet (the actual lightgun is implemented, but the required timer0 dotclk mode isn't yet properly emulated).
Dance Mat (via Keyboard)
Q W E or Keypad: 7 8 9 --> > Lt Rt
Z X C or Keypad: 1 2 3 --> [] Dn /\
Plus, Select/Start as assigned for joypads.