If you like me you find yourself wanting an AT2XT adapter, you may have also discovered that they are not too easy to buy pre-made.

Project information here

Here is one I built on prototype board, using an AT to PS/2 Keyboard cable:

Without the IC Socket on it, it looks like this:

Once the IC Socket is fitted, the tails from the AT to PS/2 Keyboard can be attached like so:

I forgot to preserve a trace to connect the shield on mine, so I’ve had to connect that through that black wire separately.

Here is the underside:

In my case I used a PIC12F675 (which needs different code)

The last thing to do is wrap it in heatshrink tube:

A modified and compiled version for PIC12F675 can be downloaded here. I just fired it in with my Universal programmer, plugged it in and it worked perfectly first go.

If yours is using a PIC12F629 like the original design, get the firmware from the original project information page.