* RSX-11M - Plus V4.3 BL66 2044.KW System "Pt/Ps" * > RED DU:=SY: * RSX-11M/RSX-11M Plus Standalone Copy System V03 Most common cause for those symptoms is that the LTC (Line Time Clock aka "60 Hz" although probably "50 Hz" for you) clock is disabled. On a 11/93 in a BA23 or BA123, it might be disabled because of the little front panel DIP switches, or because the cable going to the front panel selectors switches fell off, or in the setup firmware on the processor board. I think the 11/93 can be configured to provide its own fake LTC interrupts from on-CPU-board crystal too (been a long time!) Tim.