I have an old Adaptec PCI SCSI controller from around 1995 (BIOS date, will get full model if needed). It's lived its life in an old 133 MHz Pentium from around 1995 as well.
The controller is 50 pin and has a CD-ROM and 1 GB HDD connected. The CD-ROM is on ID #2 via jumpers, the hard drive is #0 via jumpers and controller is #7.
There used to be Windows 95 on a second HDD which died, so I decided to reinstall on the current 1 GB drive. However, the PC will not boot off the CD-ROM nor hardrive. When I put in a Windows 98 SE install disk, Linux live CD, and custom MS-DOS CD, it says bootable drive detected but gets stuck after saying bios installed with a flashing underscore. I then took the controller and drives out and placed in a bit newer PC in which it booted right off the CD-ROM and then I installed DOS to the hard drive and booted and it worked no problem.
Placed back in original PC and got the same error. Set to boot off the hard drive and it says invalid partition table. What could be causing these errors? Since it works on the other PC without changing settings, it is confusing me. I feel the issue lies within PC, as the BIOS has no option to boot off external device, only A: and C:.
Unfortunately, I don't have a working floppy drive to boot off of to try that. I have tried all different settings in the Adaptec BIOS with no luck.