Running in realmode(read - DOS) I'm wondering, sopose i have code which has invlaid opcode in it, and it's prefaced with lock, segment overrides, 66h, etc. which offest will be pushed to stack when cpu will try to execute invalid code. The offest of preface instruction, or the actual instruction? And as additional question. When win9x detects invalid opcode, it happily closes dos box. Is there a way to disable that feature, and let dos use it's own int06h to handle it? Sorry for my bad english,typos,and lack of logic.