pdp-8/e restoration.

Doug Ingraham dpi at dustyoldcomputers.com
Fri Aug 4 10:23:06 CDT 2017

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

More information about the cctech mailing list