The author of this ultimate device is very open to new add-ons and extensions, incl. memory/port mapper, ZX-Blitter or ULAX, already promised to implement Coupé´s palette and also, partly, graphics modes.
This interface is not cheap but much more powerful than any other expansion. It is compatible with all original ZX Spectrums and most popular clones. Its FPGA-core does not support SAM Coupé yet. I intend to make it work with our beloved Coupé. If you are interested in connecting the MB03+ with the SAM Coupé, please let me know.
Regards, J. (sam.speccy.cz)