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i have seen john fines bootloader but partcopy wont work, grub i just have no idea how to use and im not sure its fat12, and everything else is 16bit
i have tried editing john fine's source code to bootf02 but appearntly his source code is different from his compiled code because the precompiled one works fine but when i compile it it dont work

so are there any

grub does work with FAT12, though it's a very ugly solution (it hard-codes its second-stage)

john fines code (iirc) loads PMode from the boot-sector (which i find to be very restrictive)

basically its not hard to write your own if you want to otherwise use grub (since it works better) but youll have to reformat a disk and reinstall grub anytime you want to make it bootable -- i don't since my boot sector loads properly from FAT so i just copy my file to ANY fat12 disk (which i formated) and it will boot

is your bootsector 32bit?
and i use virtual images for nearly everything except for when i want to test my os on my real pc so formating and copying really dont annoy me much

edit:
seems i got partcopy working long enough to make an image with the bootsector i needed on it, even though now it dont work i got it on an image so really for now i wont need another bootloader

edit2:
forgot that partcopy worked on a dos bootdisk, all i had to do was bootup dos in bochs mount my image i want to make bootable and run a little batch file i made and thats it