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Fix NES UI Palette Base Address and PPU Scroll Reset - #12

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fix-nes-palette-and-scroll-10596832207637083502
Oct 21, 2026
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ClausValcaTD merged 1 commit into
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fix-nes-palette-and-scroll-10596832207637083502

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Corrected palette initialization in targets/nes/src/ui_nes.c to latch PPU address $3F00 and fill all 16 background palette bytes. Removed trailing PPU_ADDR = 0x00 writes following PPU_SCROLL = 0x00 to prevent PPU scroll register corruption.


PR created automatically by Jules for task 10596832207637083502 started by @ClausValcaTD

Correct palette initialization in ui_init() by properly writing
the 16-byte background palette starting at PPU address $3F00 with
color 0 as $0F (black background), color 1 as $30 (white text),
colors 2-3 ($16, $27), and filling remaining entries with $0F.

Also clean up PPU scroll reset by removing PPU_ADDR writes after
PPU_SCROLL reset in ui_init() to prevent register corruption.

Co-authored-by: ClausValcaTD <193546948+ClausValcaTD@users.noreply.github.com>
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@ClausValcaTD
ClausValcaTD merged commit afac3b5 into main Oct 21, 2026
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ClausValcaTD deleted the fix-nes-palette-and-scroll-10596832207637083502 branch October 21, 2026 16:49
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