MB03+ Ultimate²  is a next-generation, powerful and compact ZX Spectrum interface that in all-in-one solution brings the functionality of a large number of hardware and system add-ons  for the ZX Spectrum and compatible computers. This modern device can be normally connected to the standard computer´s edge connector. MB03+ is based on modern and fast FPGA and other advanced chips, compatible with it's predecessor MB02+ and also with other popular interfaces such as divMMC and divIDE.

Specifications :

• square shape 10x10cm board, connected to ZX edge socket in horizontal position
• powered by ZX Spectrum - very efficient switch power supply
• FPGA Xilinx Spartan7 - XC7S50 484pins, the main brain of the machine
• 16MBytes SRAM + 2MBytes Fast SRAM + 1MBytes FLASH + FRAM 8KB (system info, bios config); every RAM is expandable through expansion sockets;
• RTC DS3234 - extremely Accurate RealTimeClock with SRAM (a BIOS config storage) - emulation of RTC72421 via FPGA (ports, regs, etc.)
• CompactFlash(IDE) card and 2x microSD cards sockets.
• WiFi ESP8266 - wifi module.
• 2x USB ports, one for user friendly firmware update, second for K-Mouse or Keyboard
• Z80 DMA
• tremendous sound capabilities: 3xAY - TurboSound or TurboSound FM (2xYM2203), SAA1099, SounDrive/Stereo Covox/Specdrum, SID and General Sound.
• Digital video output to TV with audio.
• fully compatible with all original ZX Spectrum models (ZX 128 standard recommended for the best gaming and demoscene experience)
• Ultimate firmware - a quick startup with all basic options, switchable configurations
• expansions sockets
• MB02+, MBIDE and BSDOS308 compatible.
• divSD, divIDE, divMMC and esxDOS (UNODOS) compatible
• compatible with other systems, like Residos in the MB02+ mode 
• Custom ROM loader - DerbyPro e.g.
• ULAplus palette
• TIMEX Hi-Color and Hi-Res graphics modes
• GigaScreen (non flickering), scan line effects
• ZX-Uno's Radastan graphics
• HiResColour, HiResindeXedColour and HGFX modes