This morning it occurred to me that the DBIT FDADAP 3.5"-8" floppy adapter might not be bidirectional. A post on the VCFED agreed with me, so back to the drawing board. Fortunately nf6x (Mark) on there had designed a simple adapter and had a schematic on his gitlab so I rewired one of my own adapters I designed at xmas.

It kind of works. The READY light pulses on the gotek so it's trying to boot, but it doesn't like my disk images. More testing needed.