26 Apr
2015
26 Apr
'15
7:44 a.m.
John,
my post on classiccmp is not appearing on the list, so here a direct mail:
...
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, 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.
hope this helps,
Joerg