Using either the stock RH61 netboot disk supplied in the 6.1 deluxe ed pack or a doanloaded image (Oct22), the Installer's not seeing my AHA 1540 SCSI controller. It's actually the kernel that is missing it. "0 hosts detected total", as we've all seen before. This card is about as old as I am, and I think even Beos has a driver for it - it's that old. The machine, especially the 1540, seems to be functioning fine.
Is this an ISA card?? If it is, then you will need to boot in expert mode, which will put you in a sequence which will allow you to specify the hardware which is on your system. If something else is going on, please reopen this bug with more details about what is happening with your system.