I think stationary computers are used because the are more adapted to rugged environments.
So I thought. Why should schools in Africa throw away their stationary computers when there should be a possibility to upgrade them. I was thinking that one could use Raspberry Pi’s or other single board computers.
Since there exist cheap hdmi to analog vga adapters. An old CRT monitor would still be of use.
However come to think of it. Considering the cost of electricity. A CRT screen is a bad choice. Much too warm and power hungry.
So if they could get hold of the raspberry pi’s together with used lcd screens I think power costs can be kept down.