I have both IPAD first version and latest version, and I found that there is no iOS app for IPAD 1st generation, and at the same time I realized volume on the latest IPAD air is too low under maximum setting.
Rather than letting the old IPAD collecting dust, it's acutally very suitabl for it to be a TV viewing device.
If there is a build for the old IPAD, it will be great.