11 Aug
2002
11 Aug
'02
12:52 p.m.
At 05:03 PM 8/11/02 -0400, Christopher McNabb wrote:
Well, this PDP-11/24 I picked up yesterday doesn't
appear to want to boot.
All boards appear to be present (at least, going by the table under
the lid)
and in good shape physically.
When I turn the keyswitch to 'LOCAL', the 'DC ON' light comes on and the
'RUN' light comes on for about 1/2 second. When I push the 'control'
switch
to 'BOOT', the Run light comes on or about 1/2 second, then goes out.
Looking inside, there are three lights on the M7133 cpu board, labeled
'0',
'1', and 'CLK'. The '0' and '1' lights are on
continuously, the 'CLK'
light
only comes on for the 1/2 second after power on, and while the 'control'
switch is held in 'BOOT'.
According to the 11/24 "Maintenance Card" CLK is the CPU clock
indicator. The 0 and 1 LEDs are used by the Power-On diagnostics; ON/ON
means that the processor test has begun but it may well be that the
processor test never started. Is the M9312 installed?
What happens if you hook up a terminal to the console port? Does it go
into ODT mode the '@' prompt)? If so, you can run the diagnostics with
'165006G' at the '@'.
As usual, I have absolutely zero docs on this system,
so any help would be
appreciated.
You're welcome to this maintenance card if it's of use.
-Rick