PDP-11/70 debugging advice

Fritz Mueller fritzm at fritzm.org
Sun Jan 31 21:04:28 CST 2021

> Yeah.  I want to get the fans installed and then go triple-check all the power signals and get the voltages dialed in nicely.  But then things come out on extenders :).

Yup -- I'm surprised how picky my '45 is about +5 undervolt; it really seems happiest with trimmed up to about 5.1 at the backplane.

Looks like E106 on the RAC (M8123) might be a good place to start (drawing RACA, lower left.)


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