Just for the record, it's perfectly sensible to hook a drive for an old mac up to a new mac running OS 8 or 9 or whatever, boot the new mac normally, then chuck the 7.5 CD or 7.1 floppies or whatever in it and use the installer to install the old OS to the drive for the old mac. You don't have to boot the OS you want to install, and you can install to other than the boot drive.