25 Apr
2015
25 Apr
'15
1:32 p.m.
Am 25.04.2015 um 06:32 schrieb Josh Dersch:
While I was waiting for the Ridge's disk to dump
over a 9600bps serial
port, I finally got a chance to work on my 11/34. Picked it up last
summer and it was in good shape but the power supply was completely
dead. I've rebuilt the supply and last night I worked out the last few
kinks.
So at this point all voltages are spot-on, the AC LO and DC LO signals
are high (these are active low, right?) but I can't get the machine to
respond at all -- the "DC ON" and "RUN" lights are lit up brightly,
and
the "SR DISP," "BUS ERR," and "MAINT" lights are glowing
dimly. The
status register display is dark. The system does not respond to any
keypresses on the panel.
All LEDs "glowing dark"?
I've seen this too, when the 20 pin cable from M7859 to the console
panel is plugged in reversed.
Don't trust the marked Pin 1 wire: sometimes DEC manufacturing twisted
the cables.
Joerg