@ Karlos,
I know you can get such a device that responds to a key combination to switch between systems. Does anybody here use a such system between Amiga/PC?
My company uses switchers from a company called "Black Box". They're very good quality and produce no noticeable signal loss even when they are being powered by the voltages on the cables that they are switching. They have a connector for optional power. The model number is SW625A-R2. They handle monitor, keyboard and mouse.
It has a button on the front for switching between sources. Plus, it also responds to switching via the keyboard. You press and release one key at a time in the following sequence:
, , , to select the "A" source.
, , , to select the "B" source.