Re: modifiable backplane with sockets?

On 5/29/2025 1:18 PM, Don Y wrote:

The individual modules (sum/gain/integrate/etc.) were hidden "inside"
the OPENED briefcases.

I.e., when you opened the briefcase, none of the components were visible.
There were schematic symbols drawn on a plastic (wood?) surface.  The schematic
connections to each symbol terminated in these "conductive holes" that accepted
the tapered pins.
In this way, the electronics were protected from being disturbed/broken
by careless students.  And, the illustrations on that wooden surface
let the student see what they were attempting with their interconnections.

They were interconnected using discrete wires
with tapered pins that could be wedged into holes in the briefcases.
(so, they were somewhat permanent but could be dislodged with deliberate
effort)