On 2023-06-19 18:04, D. Hugh Redelmeier via talk wrote:
Except varous things exploited them. Like whacking on GPU registers only during blanking intervals to avoid tearing.
You may recall the Sinclair ZX80, which had a performance mode which killed the video. If you wanted a display, you got much less performance.
https://en.wikipedia.org/wiki/ZX80
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