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The THMFC1 is a custom floppy controller developped by Thomson and used in the TO8, TO9+, and TO8D, as well as the floppy controller expansion for the MO6 (which also works on older machines). It's a very flexible floppy controller, as it leaves a big part of the work to the CPU. One interesting fact is the ability to use QDD drives as well as regular floppies.

Register map