The issue is that the BlueSCSI and SD card work with the Darksoft ISO, but the same BlueSCSI and SD card do not work with the original ISO. I have tried an ISO copied from the original CD, a file converted from MAME, and a file provided by my colleague msamiullah.Then you're doing something wrong, because those definitely work.
I might be doing something wrong, but I followed all the setup and installation steps correctly. I think the problem lies with the ISO file—there might be an extra step involved.