System programs must load at $2000. You will need to load your code there and relocate it as necessary. The program name does not need to contain .sys or system, but the filetype must be $FF. jim On Wed, 21 Mar 2001 yohtsuka@geocities.co.jp wrote: > > I want to make a XXX.SYS file. (Starting form $1B00) > How do I make a .SYS ? > > --------- > yohichi >