That's very sad. I knew Mark thru his work on TOPS20 networking and the Panda Distribution. I'm sure there are several people on this list running TOPS20 emulations using Mark's Panda TOPS20. It was at his suggestion that Spare Time Gizmos made the Panda Display panel so that KLH10 and TOPS20 could have a real blinky lights front panel. He'll be missed. Bob