It is worth noting that some monitors are more tolerant to longer or shorter frames so the result may appear correctly on them and not on others.
In addition some games may have been programmed and tested on only 1 CRTC type so may not work on others.
Wonderboy sets R4 every frame to the same value - reason unknown. But it doesn't use Rupture, because if this code is removed it works fine.
This is a an incomplete list of games that use this technique, but according to this list the earliest games used this technique was 1987:
|-
| [[Warhawk|Warhawk]]
| 1987
| Yes
|-
| [[Wonder Boy|Wonder Boy]]
| 1987
| Yes