Write on SD with ps2 keyboard trought Arduino

Hello, I'm new here.. I would like to realize a project:
with my Arduino Uno I would save text on a SD card written whit ps2... I'have succesfully connected my SD shield to arduino, now I have to connect the keyboard to arduino..
There is someone who can help me also with the code???

Have Google'd PS2 keyboard arduino interface ?

Yes, sorry.. Now I want to split the signal of keybord and save one to the SD and to send the other one to the p to write as normal keyboard, if i connect the kayboard to pc it works, if i connect it to arduini it works also but I split the signal doesn't works anything.. I wish to you undertand what i mind..