I don't understand, sorry. Do you mean TSRs? When installing normal interrupts, you only install a pointer. The reason why interrupts need so much space is the IM 2 table(257 bytes). Well, we decided to left them in, since many games may profit from it. (Especially realtime counters) Andreas ---------------- E-Mail: ess.andreas@computerhaus.at Webpage: http://andi.ganymed.org