Error codes for 11/73

From: Richard Kurtz <>
Date: Sun Jan 9 15:57:43 2005

I'm sure this is a familiar question to many - does
anyone have a list of the two-digit codes displayed on
the PDP11-73 during power-up ? I am resurrecting a
dormant unit which stops at '1' (I have only the CPU
and memory installed in the backplane) I'm not sure if
this is a good or a bad code. Any help would be


David Comley

Dave, the Error Code 1 = cpu error

1. Make sure that your cpu diag switches are correctly set

2. Make sure your +5vdc and +12vdc power supply is good

3. Make sure your eproms do not have any bent pins

Received on Sun Jan 09 2005 - 15:57:43 GMT

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