Keyboard problems

[Feltzkrone]

I don't know where is the right place to post my question, so I did it here...

When using a keyboard in WinUAE and configure it to simulate both joystick you have got the problem that the first player, when pressing some keys, block the keys from the second player and vice versa. I'm sure this has to do with the technical nature of keyboards and not with emulators or WinUAE in general.

Certain keypresses are not recognized if certain other keys (usually you get problems when trying to press at least three keys at once) are already held down. My question is...

Is there any table / keyboard layout image available, from which you can see which keys would block each other? Does it depend on the keyboard type (and manufacturer) or has it to do with the PS/2 interface?

For example it's not possible to press "1" + "r" + "g" at once, but "3" + "r" + "g" and "r" + "h" + "l" do work. Try this in notepad or somewhere else. It doesn't work on my Logitech Wireless Office keyboard.