New documentation has been posted:
This hadn't been updated for a year so there is quite a bit new there, including descriptions of 4-bit sprites, relative sprites and the nextreg interface.
One incompatible change since it first appeared in how 512-tile mode is selected. Instead of requiring the ULA to be turned off for this, it is selected by a separate nextreg bit so you can still combine the ULA screen and the 512-tile mode screen.
Description of how the prescalar is calculated for sampled audio.
Otherwise mainly additions for improved compatibility with the Z80-DMA which shouldn't affect normal usage.
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Noticed and appreciated!
Backer #2741 - TS2068, Byte, ZX Evolution