Reference Disc for a Research Machines PC-386

I'm looking for a reference disc for a 1991 vintage Research Machines Nimbus PC-386. It is a very peculiar design with MCA slots from a riser, an MCA IBM 380 (80Mb) HDD that is connected to the mainboard with a right angle riser and it has custom memory boards. The BIOS is by Chips & Technologies and is dated 1989 v.5.1J I have got a program called PSETUP (from Research Machines) that allows me to configure the RAM, date and time, but it won't see the hard drive and I suspect I need a newer version of the PSETUP program. I'd quite like to get this working as a neighbour brought it over (she's over 60) and she misses her card games! I've tried the Reference Disks of IBM model 60 and 80, but they bomb out saying they don't recognize the hardware. Any help would be appreciated. Cheers Dave