Reddit mentions of Playstation 2 PSX TO PC USB Converter 4 Ports (Super Joy Box 5 Pro) SKU: 01056-4

For PS2 players that want to use the same controller:

http://www.amazon.com/Playstation-PSX-Converter-Ports-Super-2/dp/B001DU25UO/ref=sr_1_1?ie=UTF8&qid=1407789204&sr=8-1&keywords=super+joy+box

http://www.play-asia.com/super-joybox-5-pro-paOS-13-49-en-70-qc4.html#reviews

Lets you hook up to 4 controllers to 1 USB port, with pressure sensitivity and rumble. I'll see if I can find the driver page for it later.

The big trouble with PS2 users wasn't the population in North America, since the HDD was only in production and distribution for our region for 9 months. It's that it's a very popular platform in Japan, from a time when many people didn't own their own computers. Mobile platforms have been much more popular in Japan than PCs for gaming.

Here is the mobile version of your link

Gotcha. I'll see if this guy will come down a bit and see what happens. Also, any tips on PS2 -> USB adapters? His is PS2 and I plan to use it on Stepmania on my Mac. This one looks promising: http://www.amazon.com/Playstation-PSX-Converter-Ports-Super-2/dp/B001DU25UO/

https://www.amazon.com/Playstation-PSX-Converter-Ports-Super-2/dp/B001DU25UO

Bought this one less than a month ago, works perfectly... jumps, hands, you name it. I'm not sure how/if it handles two pads at once, though.