You can emulate following platforms out of the box:

ZX Spectrum (Pentagon timings supported)

Apple II

Atari 2600

Atari 7800

Electronika BK0010/BK0011M

MSX

NES

Sega MasterSystem/MegaDrive/CD/32X

ZX Spectrum

Amstrad CPC

Commodore 64

PC Engine/TurboGrafx-16

Sony Play Station 1

No proprietary bios files required (totally legal!)