virtualbox.org

I am trying to see whether it's still possible to run such operating systems as MCC Interim Linux from back in 1992 on modern machines. I've downloaded the images I need from here: http://www.ibiblio.org/pub/historic-lin ... /MCC/1.0+/ And, according to the documentation, I need to put the /images/nocdboot and /images/root binaries on bootable floppies. If I simply rename them to nocdboot.img and root.img respectively (EMT4WIN reports that they are valid DISKIMGE files with 2 sides, 15 sectors per track, 80 tracks for a 1.2 m diskette) and try to boot either, VirtualBox gives me a window full of zeros (00000000...) that are constantly being drawn on screen. The odd thing is that if I use WinImage to get .ima files instead, after I add the images to the boot sector and try booting from them, I get lots of interchanging ones and zeros (10101010...) instead. But neither way boots anything intelligible. Any ideas about what could be the problem here? The host system is Windows 7 x64.