SugarDS v0.8 is an Amstrad CPC emulator for Nintendo DS and DSi by Nige Rideout (github). It features :

• Emulates CPC 464 (64K) and CPC 6128 (128K)
• Loads .SNA and .DSK files up to 1024K total length (single and double sided)
• Plus2CPC Cartridge Support to load .CPR files up to 512K
• Dandanator Cartridge Support - banking only (no EEPROM writes)
• Emulates CRTC Type 3 roughly - with provisions to handle split screen, rupture, smooth vertical scroll and a reasonable facsimile of smooth horizontal scroll
• Full button mapping - supporting all 3 possible joystick buttons of the Amstrad as well as mapping buttons to keyboard keys
• Save / Load state so you can pick up where you left off