Yes, the 8/e has the 'keep-alive current'. The lamps are driven by an 8V line that runs from the power supply to the programmer's panel. -- Ian
On Fri, Aug 4, 2017 at 8:23 AM, Doug Ingraham via cctalk < cctalk@classiccmp.org> wrote: > On Fri, Aug 4, 2017 at 1:24 AM, Rod Smallwood via cctalk < > cctalk@classiccmp.org> wrote: > > > 1. Should the run light glow dimly? > > > > Without looking at the schematics I can't tell you if they bothered to put > the resistor in there to make > it glow dimly but I can tell you that it isn't necessary for the run lamp. > The reason to make it glow > dimly when off is to reduce the filament thermal shock when turning on and > off. This makes the bulbs > last a lot longer. The run lamp does not flicker in operation so not > necessary on that one. > > -- > Doug Ingraham > PDP-8 SN 1175 > -- Ian S. King, MSIS, MSCS, Ph.D. Candidate The Information School <http://ischool.uw.edu> Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical Narrative Through a Design Lens Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org> Value Sensitive Design Research Lab <http://vsdesign.org> University of Washington There is an old Vulcan saying: "Only Nixon could go to China."
