connecting a ps2 controller via GPIO

[zoomy500]

How would i connect a ps2 controller to a raspberry pi using the gpio pins?
yes, i know, there’s a tutorial on the retropie wiki on how to connect it, but it doesn’t show which pin goes where, like what is psx_cmd. here’s a link to what I’m talking to. – https://github.com/retropie/RetroPie-Setup/wiki/gamecon_gpio_rpi
here’s a picture of my ps2 controller.

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