You can download the beeb.mmb file for you MMBEEB device from here. The MMBEEB is a simple SD card to user port interface for the Acorn BBC micro. You can put 100s of BBC applications and games on a SD card – no loading from tape or floppy disk required!
Original : BEEB.zip
Updated 7th April 2017 : BEEB2.zip
Higgy’s MMBEEB file : higgy_mmbeeb-v1.0.zip