You can use an A2000 5 pin din keyboard with an A4000. You need to make an adaper cable to do this. This is what I use. I have both my Amigas hooked up to a passive KVM box using the same monitor, mouse and keyboard.
Thanks i will do that, but i only have one keyboard that works 100 procent to all my Amigas 2000.
It is because something went over my Amiga 4000 keyboard and broke a key, and the plastic that are going up from the keyboard to the key is broken lose, so when i try to use it the key is loose. Are there any way i can fix it myself when the plastic up to the key is not connected to the keyboard