25 May
2007
25 May
'07
10:55 p.m.
On Friday 25 May 2007 19:07, Mr Ian Primus wrote:
It's a 20 pin ribbon cable that
plugs into the top of the power controller, coming
from the 2.5v PSU. This connector is not keyed, and I
don't know which direction it should go -
unfortunately the way the cable is folded it could
really go either way. So, those of you that own a Vax
11/750 - which side should be pin 1?
The red stripe on the cable should go to the left side when looking at it
from the back side.
Also, on each power supply, there is a three position
toggle switch - Lo, Norm and Hi. What is this for?
I believe it's to set the input voltage range.
Similarly, I currently have the battery backup unit
removed. It's obviously going to be totally shot - the
sticker indicates the batteries were last changed in
1984. This isn't needed for the machine to work,
correct? I'm not talking about the Time Of Year
battery, I'm talking about the box mounted on the
front left side, it has a couple lead acid battery
packs in it - not enough to run the computer, I would
think - did this just keep the memory alive?
Right, it's just to keep the memory alive during short power outages.
What's the pinout of the console port? Anything
special, or should a null modem cable be all I need to
connect a terminal?
It's just a standard RS-232 connector, wired as DTE.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org