Adapting ios app for different iPad resolutions?

Question

So I've built an app, in Flash Professional using AIR 3.6, for the iPad 3's 2048x1536 resolution. However, I would also like it to be available
for iPads 1+2 (if possible). How would I go about doign this? Would the app automatically downscale on those devices or would I need to create seperate packages for them?
Will this affect performance and quality?
I only own an iPad 3, so I am, at present, only able to test for that model.
Thank you to anyone that could help explain this for me.

Answer 1

If you have done nothing special to the stage scale mode, then it will just work fine, without you doing anything.
One thing that may happen is that the iPad 1 may crash. If that happens you can solve the problem by having a second copy of your images at 1024x768, and use code to decide which of the two to show. Here is an example of how that might work, where in this case I have iPad 1 graphics on frame 2, and iPad 3 graphics on frame 3:
import flash.system.Capabilities;
var screenwidth:int = Math.max(Capabilities.screenResolutionX,Capabilities.screenResolutionY);
if(screenwidth<=1024){
     gotoAndStop(2);
}else{
     gotoAndStop(3);
You would need to decide what stage size you're working at, and have one set of images at either 200% or 50%. My preference is to work at 1024x768, and have the Retina graphics on the stage at 50%, and the non-Retina ones at 100%.