I'm sure you're probably getting a little tired of my constant posts by now, but please bear with me. I recently came across some code that writes to video memory. I mad a binary COM file from it and launched it, and it works! Well, actually what happens is the screen goes black and red horizontal lines go across it. Perchance there's someone who'd tell what exactly is happening? I really want to make sure I know because I don't want to accidentally destroy my computer!