Unreal Speccy Portable is a ZX-Spectrum emulator that supports Z80 128K (Pentagon) AY/YM, Beeper, Beta Disk, Tape, Kempston Joystick/Mouse, Snapshots. Supported formats: sna, z80, tap, tzx, csw, trd, scl, zip.

http://dl.openhandhelds.org/cgi-bin/wiz.cgi?0,0,0,0,72,511