Small German demo from 199?
Well now.....
The sprite persistence effect seen is probably best explained in this earlier thread at CPCWiki:
https://www.cpcwiki.eu/forum/demos/unexpected-plus-effect/msg199938/?topicseen#msg199938
Hardware:
6128 Plus with Rombox (includes Protext & CPM on Rom.)
Link:
https://www.cpc-power.com/index.php?page=detail&num=11650
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.