Creating Bootable CDs/Floppys(Ew)

Alright, simply put for a school project I am creating a OS from scratch. But I was wondering I have completed what I think will be a bootloader but I don't know how to test it, I was wondering does anyone have a good way using VMs to test my Bootloader+OS? Or better yet is there any software(even command line utilities) that can create a iso with a specified bootloader?

If you're working on a PPC box, look for the Open Firmware information.
If you're working with an Intel box, go sign up for access to the Intel EFI firmware.
I'll assume Intel Mac boxes.
With EFI, EFI looks at a particular FAT partition and directory structure, seeking the specified bootstrap file. The bootstrap executable file is located and loaded by EFI, and then calls back to EFI as part of its typical startup operations. Once ready, the bootstrap either transfers control to another image as part of chaining that happens in some system bootstraps, or -- if you're running an OS as one big image -- the system image flips the EFI state to booted and off it (the system) goes.
For how other systems have implemented this, you can take a look at GRUB or other such bootloader. (EFI itself has some pretty sophisticated capabilities, and a full -- albeit rather weird -- command shell. AFAIK, Apple doesn't ship this stuff by default, but there are pieces around.)
Here are some pointers to some EFI-related pieces:
http://64.223.189.234/node/392
http://www.intel.com/technology/efi/
The first site above tends toward another operating system and toward Intel Itanium, though realize that the OS and the Itanium platform use EFI. As does the Intel Mac platform.
And get access to Singh's Mac OS X Internals book.
http://www.osxbook.com/book/bonus/chapter4/efiprogramming/

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