Has anyone made some really cool (or not so cool) 512-byte programs in assembly? I used to hear about people taking part in competitions where they'd try and make, say, a bootloader (or a program like a calculator, for example) and pack-in as many features as they could, the only constraints being that it must be bootable (ie. stuck onto a floppy as its boot sector) and must only occupy the 512-byte boot sector - ie. can't load code from files on the disk and run it.
I just thought that I'd put it out there. Anyone made something along these lines? Just curious to see what people may or may not have done.