Alex White wrote: This is from memory, so may be wrong... Are you talking about the paddle switch with funny symbols next to it? It tells if it should continuously cycle through the tests. Or are you talking about the rotery switches? One decides if it should do a conversational boot (where you must answer assorted questions), or to just boot up. Other one controlls the baud rate of the console terminal. I think there were some versions that used a 3-position paddle switch instead of the rotary dial for the conversational boot option. Are the led's you are talking about the 7 segment displays? Those are used to tell you where the system is in the boot process on a VAX. Should count down from FF to 00 during boot (same info as displayed on the console terminal).