Shame no one replied to this….So I’ll tell you what i did with my ps1 controller very very similar to the one you’re using. I spent ages looking into how to wire it in,out and shake it all about….Then i gave up and bought a £1:99 adaptor from eBay that was plug and play ps1 to usb. Worked so nicely i bought another adaptor exactly the same and another joystick to match the one i had. Job done. I know you didn’t want to spend money but £1:99 is next to nothing and it was free postage(it arrived the very next day too, which i was amazed at)

Here is a link so you can see what i bought.

http://www.ebay.co.uk/itm/151043784323?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

You may not live in the UK but im sure where ever you are it’s got to be cheaper as the UK tend to charge a fortune for everything.