Posted By
Gaia
on 2018-09-01
16:53:41
|  Re: AGSP
I have never done it properly myself but it should be possible by writing to $FF1F (vertical sub address)... when the lowest three bits are 6 and the TED finished fetching the current matrix data it'll check this and fires a trigger that will generate a latching of the matrix position counters which are used for reloading the counter in the beginning of each window line for fetching matrix data.
In bitmap mode (what Murphy posted) you can move around in the bitmap mask data relatively easily by writing to $FF1A/$FF1B but I understand you're in character mode. Anyway, in bitmap mode you'd have one more free colour per character cell as you rightly pointed out  but as a proof of concept you'd be perhaps better off in character mode first.
BTW: the image is great!
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