The SCSI controller needs to be set to boot from attached CD drives in it's own BIOS, in addition to the Motherboard BIOS setting you mentioned. You don't need to set the ID of the CD to 0 though.

For any PC to start and show you a working environment or operating system to let you work, it must have a bootable device. The bootable device holds the operating system, Windows 11. If a PC fails to ...

It's easy to make boot disks on old Macs for older hardware, but as the years have gone on, it's gotten a little more difficult. Here's how to make classic Mac OS 9 and early Mac OS X boot media on ...