I am trading with a specially modified version of TWS that works on my Atari 2600. I use the joystick for order-entry and the fire button to execute orders. It has worked great so far. PM me for the ROM. You should be able to get a good Atari 2600 simulator so you can use it on your PC.
You haven't traded until you take an old PONG game and ported the chipset into tws. Then you can have one paddle for your upper limit price and one for the lower entry. The bouncing ball is the bid or the offer (if you're trying to go long or short) and you try to deflect it into your account at the right moment. Works best on Zenith 25-inch console sets.