Keropi, attached is a rough sketch of how I wired up the 7406 inside a DIP-40 socket. As it sounds like you just want a rough test to see if your motherboard will work, you can probably wire this up on a breadboard as I did early on in this thread. The drawings in the PDF should allow anyone with a soldering iron to assemble this module in the fashion I did it. I have not double-checked the PDF drawings yet, so there could be mistakes. I'll be checking it when I start to assemble my second module.
Here is a very rough wiring diagram done in pencil. When I am referring to KBC socket, I am referring to the DIP-40 KBC socket as part of my module, not the DIP-40 KBC socket on your motherboard. Of course, you can also offset the header some, but depending on the motherboard you install this into, there might not be room.
The attachment Feipoa_native_ps2_module.pdf is no longer available
And some visual aid for those who want to assemble the module how I did it. The header is JB welded to the DIP-40 socket. You must use a long header because the mouse header cable won't fit between the KBC and the header when the KBC is inserted. e.g. digikey part # 609-3490-ND. The two green components are the inductors. The 2 capacitors and 2 resistors are SMD and probably not visible.
The attachment Feipoa_KBC_PS2_Module_1.jpg is no longer available
The attachment Feipoa_KBC_PS2_Module_2.jpg is no longer available
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Plan your life wisely, you'll be dead before you know it.