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MMFS is one of several ROMs that allow modern SD Cards to be used on a Beeb with minimal external hardware (others include the original SuperMMC, Steve Picton's TurboMMC and Duikkie's SmartSPI). MMFS was written by Martin Mather in 2012, but seems to have been forgotten about until it was rediscovered in 2015.

MMFS has the following features:

• it's derived from DFS 2.x rather than DFS 0.9
• it supports MMC, SD and SDHC cards
• it supports FAT32 (upto 8GB) as well as FAT16
• it supports large (>64KB) files
• it contains the TUBEHOST 2.30 code for second processors
• the Master and Beeb/Electron SWRAM versions result in PAGE at &E00
• it preserves the current drive on BREAK
• it is under active development

If you have any issues with MMFS, then please report them in the development thread on Stardot:

• MMFS Development and Support