02-10-2018, 01:05 AM
Since the joystick was an in/out IO port, you got either 0 or +5v I believe. That was connected directly to the 6520 PIA chip. The paddle controllers on the other hand look like they're input only (essential an analog to digital converter) and are controlled through POKEY. What was interesting is that the XL's only had the two joystick ports because they used the other two ports as a memory driver. "Hey guys, how should we handle this extra RAM? Ooo! Ooo! I know. We'll repurpose two of the joystick ports. Dude, that's genius."