Here's a weird thing I found, while restoring my old #CPM computers from #GeminiMicrocomputers: while there were models available with Winchester drives (that's harddisks for you young folks), the setup was a little weird. This was the time of the #MFM and RLL harddrives, used by other systems such as the IBM 5150. Easily recognizable by having two flat ribbon cables instead of just one for each drive. RLL was a little more tightly packed with capacity, but basically the same concept - required slightly different controllers though.
Anyway, back to the Gemini. It featured a #SASI interface, which is sort of an early version of #SCSI. Did you connect a drive directly to it? Noooo. You connected a #Xebec SCSI/MFM controller. Did that require a lot of weird SCSI commands for telling the Xebec what disk was attached? Of course. Compared to how it's done today, very backwards.
Which meant I had zero luck with my new #zuluscsi device. https://zuluscsi.com/
I've got a plan B though.