if you use mkisofs, you'll want to look at the "-no-emul-boot", "-boot-info-table", "-boot-load-size", and "-b" options. You'll also want to leave some space in your boot loader for the Boot Info Table. (This took me forever to realize, so here's an example:)
Code:
jmp 0000:start
times 8-($-$$) db 0 ;this space is reserved for a quick set up and a jump instruction.
;this space reserved for boot info table
bit_PrimaryVolumeDescriptor resd 1
bit_BootFileLocation resd 1
bit_BootFileLength resd 1
bit_Checksum resd 1
bit_Reserved resb 40
start:
;do something here
mkisofs will automagically fill it in for you if you tell it to. If you don't leave space, though, your code will get overwritten and will most likely crash.
You can set it up to tell the BIOS emulate a floppy drive, like in the case of an older system (
I think this means that it will only be emulated with int 13h. It still acts like an ATAPI drive if you go directly, I think).
Or, you can tell the BIOS to not emulate the floppy system at all. This is probably what you want for a modern OS.
Good luck!