Is it possible to wait for the start of vert refresh sync or maybe even
combine a batch of screen-update operations that will all run at vert
refresh sync?

Main purpose for this is field syncing while mpeg-decoding and displaying.

Other purposes are numerous (no 'tearing'-effects for scrollers/animation).

All gfx-chips that I've read the specs for support the IRQ9 (or equivalient
in PCI) when the CRT-controllers start the VR-period.

And ok, if I can't do it using KGI/GGI, how can I do it? I need it :-)

ak.

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