Small French demo from the late eighties or early nineties which displays two screens and plays two excellent toons (Warhawk & Asphalt) - pressing the Return key switches between them.
https://www.youtube.com/watch?v=FVxwwJaty5I
Links:
https://www.cpc-power.com/index.php?page=detail&num=16150
https://cpcrulez.fr/demostestDO_hacked_by_byte.htm
https://en.wikipedia.org/wiki/Warhawk_(1986_video_game)
http://www.cpcgamereviews.com/a/index10.html
Not emulated - original hardware and software.
Please note that the aspect ratio for this YouTube video is 16:9 but the CPC monitor
has an aspect ratio of 4:3 so you may wish to adjust your viewing device accordingly.