Just finished the Os and compiled and tested all the test programs with my compiler. I am truly a happy camper . Want to say thank you to everybody in the forum who helped me along the way. Want to send a very special thanks to Cadet for his help. My future project is to create a physical implementation of the Hack system and increase its power and efficiency. I.E. more registers, bigger ROM, and maybe even color display capability, also some mass storage on a modest sized hard disk. Maybe i might get it up to the Magic 1 by Bill Buzzbee. If you haven't seen this check it out at www.homebrewcpu.com.