Qbus
Veteran Member
The loop is a fun little program and apparently is good for all of the PDP-11 family, Unibus and Qbus. As long as they all use the same ODT and default addresses for the CON (777560) and the output to the terminal (777566). You may want to look real close at the cable that connects from the backplane to the power supply, not the heavy straps but the little multi conductor cable and its plug along with all the connectors in the power supply itself. Been a long time since that things been working and you may have some issues with corrosion and dirt due to age and that may be causing some of the flakiness with the regulation. It’s important to remember that the power supply samples the voltage on the backplane and there are at least a couple points where that sample goes thru a plug.
Do you have that thing in a rack? Or are you hefting it around on a table top? My 11/34 is in a rack with the slide rails so you can slide the system in or out of the rack and when extended out of the rack it’s on pivots so you can flip it up to get to the undersides without killing your back.
Do you have that thing in a rack? Or are you hefting it around on a table top? My 11/34 is in a rack with the slide rails so you can slide the system in or out of the rack and when extended out of the rack it’s on pivots so you can flip it up to get to the undersides without killing your back.