So I'm working on my emulator and I found that some games (Mega Man 1, Duck Tales) are like NES games using the background layer to make a status bar, unlike other games that use the window layer.
Does anyone know the specific rules to mid-frame updates? Right now I have it worked out to a point that it works ok, but I'm not sure it's perfect. It seems to me like the amount of lines rendered so far affects what part of the screen is drawn when you change the scroll value though, unlike on NES. So anyone with a good explanation of how it works I'd be interested in hearing it. What I have right now works but sometimes its off by a few lines.
Does anyone know the specific rules to mid-frame updates? Right now I have it worked out to a point that it works ok, but I'm not sure it's perfect. It seems to me like the amount of lines rendered so far affects what part of the screen is drawn when you change the scroll value though, unlike on NES. So anyone with a good explanation of how it works I'd be interested in hearing it. What I have right now works but sometimes its off by a few lines.