In other words, do I need to test the demo I'm working on on a real machine before releasing it? I'm planning to get one of course, but I'm not sure when.
For instance I have read that you should avoid setting the sprite motion registers in the first 24 cycles after an HMOVE. This can indeed cause trouble, but in some cases it seems to be working fine, on Stella at least. Can I be sure it will on a real Atari 2600 as well? And can I count on the colors to be correct, especially when it comes to luminances? This is relevant when mixing colors from different hues to create alternative gradients.
Any other PitfallsTM?