Here's a very good article extensively explaining the ZX81's video display system.
Written by wilf rigter in 1996, this tutorial from 8bit-museum's collection of Sinclair scans gives excellent information about how all things video work in a ZX81.
https://8bit-museum.de/heimcomputer-2/sinclair/sinclair-scans/scans-zx81-video-display-system/
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