I posted two articles yesterday. one of create my apple II joystick, another topic is ''thumbstick'' I can solve the method of this stuff.
this article's schemastic has a little random. my investigate result. you can easily to create it. just use 16 capacitors to x,y, that's enough. it is no essential to add trim pot. then you must connect line to the computer. it is done. you can try to read original english article(my article inside). then consider my blog.
perhaps my chinese blog many cyber friends computer none of characters are coming up. but can watch pictures.I believe you can see it.
thanks for your watching