TU58 emulator - test-drb@ccmp.vtda.org

29 Jul 2012

I agree, but only because RL's and an 11/23 are pretty light.  Change that to an 11/34
in a 10.5 inch box and a couple of rk05's and, over the years, things might sag over
time - the posited fat people would not be sitting there day after day all day long.  The
analogy I usually think of is a water bed in an older house.

The extra plywood helps, and is may also be helpful to have heavy systems along a side,
rather than in the middle of the floor.

Since I am not a structural engineer or anything like that, I guess it might depend on the
spacing of the joists and the subfloor construction, and, on the sides, what kind of loads
the walls are designed to bear.  (In my case, my collection is on my basement concrete
floor, and most of it is along the sides.)

mcguire at neurotica.com wrote:

...

  You are not even remotely in dangerous territory here.

  For some perspective, think of a sofa with "feet", with two or three fat
people on it.

               -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

On Jul 28, 2012, at 4:51 PM, Earl Evans <earl at retrobits.com> wrote:

   This
conversation has started to worry me about the PDP-11/23 system in my  daylight
basement/family room.  It's the largest single room in our home,
 and on the bottom of three floors.  It is a wooden floor, with (large)
 crawl space underneath.

 The configuration is a PDP-11/23 in a BA23 chassis, 2 RL02 drives, and the
 standard DEC rackmount cabinet (which is pretty heavy itself).  The entire
 cabinet has been placed on a 2 foot by 4 foot piece of half-inch plywood to
 evenly distribute the load.  It is located near one of the load-bearing
 external walls of the home.

 RL02 drives weigh 75 lbs by themselves.  Does anyone have a rough guess on
 what the total weight is for the system I described, and whether or not
 this would be safe for residential basement wood flooring?  I realize there
 are a lot of factors - I'm just trying to get a wild guess before I start
 getting panicked.

 Thanks,

 - Earl 