Emulating a fairly unique floppy drive at a flux level is kind of a nightmare.
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Maybe in the later machines, but this is the OG model from 1981. The controller, to the extent that there is one, is a 6803 with 2k of PROM, a FDC9216B PLL to do clock/data separation, and a bucket of discrete logic to make it masquerade as an SMD hard disk.
I'm not having any trouble understanding the circuitry itself, but I've yet to work out how MAME's own flux-level disk image handling works.
@o_galibert is a far more brilliant coder than I'll ever be, but that unfortunately makes his code as opaque as a brick wall to me.
