pdp-8/e restoration.

Ian S. King isking at uw.edu
Fri Aug 4 15:20:45 CDT 2017


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 at classiccmp.org> wrote:

> On Fri, Aug 4, 2017 at 1:24 AM, Rod Smallwood via cctalk <
> cctalk at 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."


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