ZXDS is an emulator of Sinclair ZX Spectrum for Nintendo DS, written by Patrik Rak. It is steadily reaching a mature stage of development, and it already has some noteworthy features, like accurate emulation of Spectrum 48k, 128k and Pentagon models (including sound), or support for TAP/TZX/PZX tape files, TRD/SCL disk files and RZX playback files.

Changes:

* Spectrum +2A/+3 snapshots are not rejected right away anymore. Instead, they are executed in 128K mode with extended paging enabled. This makes some +2A/+3 RZXs and exclusive software work quite fine.
* Added a bit of color coding to the controls screen.

http://zxds.raxoft.cz/