Ikonsgr is already the author of two expansion cards for Amstrad CPC:

• first card the USIfAC (Universal Serial Interface for Amstrad CPC)
• and its evolution USIfAC II

He just released a new expansion card : multi purpose board : 512K RAM Expansion/32x Rom board/256K Ram+2X Rom board (a complement to his II) with the following features :

• 512K RAM Expansion (default mode, should work with other boards too,like M4, DDI interfaces etc.)
• 32X Rom board mode (supports both lower and upper roms)
• 256K Ram expansion + 2X Rom board mode (supports both lower and upper roms)

You can see two videos of demonstration (the first one being already showned below) :

• first demonstration video
• second demonstration video