Big thanks to Snupps for sponsoring this one. Search for the app on the app store or the Google Play store. Or use these links!
iTunes: https://itunes.apple.com/gb/app/snupps/id771685459
Google Play: https://play.google.com/store/apps/details?id=com.snupps.snuppsdroid
Computers shown in this video: Amstrad PPC640, TI-99/4A, BBC Master, Sony Hit-Bit 75B, Amstrad CPC664, Atari 520 STE.