Just need more information on these certain cores

emxu,nx engine,pcem and rustation like what they emulate if they broken or wiki needs updated

Rustation is very early in development. Mednafen-psx-HW uses its hardware renderer but the rest of the emulation is more mature, so you should generally use it instead of rustation at the moment.

Emux is a multi-emulator that does gameboy, sega master system, chip 8 (not pico8, just to be clear) and NES. I don’t know how well it does any of those vs other cores.

PCem emulates old IBM-compatible PCs.

NX Engine is a recreation of the Cave Story engine. You can use it to run Cave Story on platforms other than Windows.

Ty for information