It is part of OS 3, AGA screenmodes from Commodore. There is no flicker in those screenmodes but they are kinda slow. At least with to many colors. If of any interest I could try them out.
Productivity
640×400 @ 72Hz up to 4 colors
64 color palette
Productivity Laced
640×800 @ 72Hz up to 4 colors
64 color palette
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