Yeah, I encountered the problem when writing a bootloader, that's why I brought it up! :) Don't rely on the BIOS' values. You can for example use a far jump to

Yeah, I encountered the problem when writing a bootloader, that's why I brought it up! :) Don't rely on the BIOS' values. You can for example use a far jump to reset CS:IP if you rely on them having specific values. [Edit: Or, maybe better, just don't rely on them.]