I used this software-only approach since it was cheap, and easy to solder chips (DIP packages) were available. But there are limitations to this approach: Many CPU cycles are wasted for USB ...

By being so common, people would think Worms Armageddon would be cheap to buy, and it is, save for NA N64 copies. It's the only one whose CIB and new copy prices are in the 4-figure range.