ULtimate Interface for Amstrad CPC (a.k.a. ULIfAC), is a multi-function board (combines usb mass storage + Ram Expansion + Rom board + Wifi/Bluetooth connectivity, all in one board!) designed for Amstrad CPC 464/664/6128 offering many amazing features:

• Multiple operation modes: 512Kb Ram Expansion Mode, 32X Rom Board Mode, 256Kb Ram Expansion + 16X ROM board Mode (CPC 664/6128) or 192Kb Ram Expansion + 16X ROM board Mode (CPC 464)
• Incredible loading speeds of up to ~30kb/sec (6-7 times faster than a Real Disk Drive)!
• Use a Usb stick or PC Hard Drive (through ESP8266 WiFi module or UART serial cable) to: Change/create/delete directories and load/save/delete programs/games even Ascii files!
• Full read/write access to DSK images of both AMSODS and PARADOS formats!
• Access up to four DSK images and choose them "on the fly", to support all multi-image Games!
• Load .SNA snapshot files!
• Many RSX commands (Basic commands used directly) for: Copy files from/to floppy disks, transfer DSK images to floppy disks, backup floppy disks to dsk image files, quick Format disks, File manager, Diagnostic tools, Instant load of Parados Rom, Text/ascii file viewer and many more!
• Convert instantly a CPC 464 to a CPC 6128 using a simple RSX Command!
• Automatic Rom mounting upon cold boot!
• Includes 3 classic games, GALACHIP, PACMAN and KILLER GORILLA!
• 1kb EEPROM for use as extra memory or for storing/executing your own routines.
• Equipped with a Reset button and a Pause switch

And here are some demonstration vidoeos:

Amstrad CPC 464 with ULIfAC board, running CP/M Plus

Amstrad CPC 464 with ULIfAC board, running Symbos

Amstrad CPC 464 with ULIfAC board, running Pinball Dreams Game.