Way back when I used to run the Promise EIDE 2300 Plus HD and I/O controller. We are talking IDE connectors though...and most likely that would have been Warp3 timeframe.
Anyways...I thought I still had the original Promise device drivers, but no luck. I had actually worked with them to address a bug that I originally found. However...when Dani published v 1.8.5 of her drivers the Promise controllers showed up as being supported and indeed, following my testing I shared with her my feedback to that effect (just now I found that email archived in one of my PMMail OS/2 folders, we are talking Apr_2009 timeframe).
Therefore, my recommendation would be that you download the latest Dani driver, search Hobbes, I think 1.8.15 is the last one she released.