DownloadCP/M Plus on ZX Spectrum +3 has ability to load device drivers from normal disk files (with .fid extension) on boot. One of the most important devices for any disk operating system is the mass storage drive. Although ZXMMC device is available on the market for years and it works well with +3e firmware, partitions created on MMC cards could not be accessed from CP/M world. At some point it became so frustrating, I decided to write FID driver for it. It's not perfect, but it works surprisingly well.
For list of limitations, build instructions and more details see the source code file.
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