searching for the pinout of a ATEN KVM switch, I found it and realized that you don't have it ...
So, you might be interested in the pinouts given on the following page:
It gives the pinouts of the two similar cables, DB25 <-> DB15HD + 2 PS/2 for connecting
a PC - VGA/mouse/keyboard with a KVM switch and a converter between both.
regards & thanks for your wonderfull collection of pinout data