Open source ZX-Spectrum emulator for Dreamcast console.

Features:

ZX-Spectrum 48K, Plus/64K, 128K, Plus2 and Plus3 models.
Assembler RACE/FACE Z80 core.
Joystick emulated: Kempston, Sinclair1, Sinclair2 and Cursor joystick.
Filemanager with subdirectories access.
SNA and Z80 snapshots support.
TZX and TAP tape images support.
Fast loading tape time.
Virtual keyboard and virtual tape
Under PAL dreamcasts ask 60-50Hz selection.
GNU/Linux and Windows video scaled and TV filter using hardware.

http://chui.dcemu.co.uk/zx4all.html