http://www.inlink.com/~hudson/ti-files/archive/util/z80href.txt http://www.inlink.com/~hudson/ti-files/archive/util/z80iss.txt http://www.inlink.com/~hudson/ti-files/archive/util/z80time.txt These are all from Ti-Files.. but they werent that easy to find in there so.. well look at them.. there is opcode timings and all that shit.. //Peter Widenhammar