FlashFS 1.0.0 FAT16 SD card sideways ROM for the BBC Micro - SD (MMFS-compatible User Port) access over bit-banged SPI, FAT16 superfloppy or MBR-partitioned cards - *MOUNT [n] / *UNMOUNT, *CAT, *INFO, *DIR / *LIB, *PART (MBR), *FORM (quick FAT16) - Read-only filing vectors: OSFIND OPENIN/close, OSBGET, OSGBPB block read, OSFILE load/info, OSARGS PTR/EXT/EOF - FAT12 and FAT32 rejected at *MOUNT with clear messages - jsbeeb integration suite (hardware-level SPI emulation): 11 suites, all passing - CI `test` stage running the suite on master/tags