I still can't find where it says "8085A" in the 110/130 manual, but page B-3 gives I/O page timings and mentions an "I/O microprocessor" and the fact that word I/O takes 90 usec but byte I/O takes 180 usec. So that certainly explains the difference in the DUV driver. Plus the manual specifically says that RSX11S is available for the /110, so I guess it was even supported! Sweet. John Wilson D Bit