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feat(audio): implement PSG noise channel 4

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0xrsydn 2026-10-07 02:51:46 +07:00
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docs/usability-roadmap.md
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@ -39,10 +39,10 @@ The [pinned Pong homebrew](public-pong.md) passes scripted menus, ball movement,
The native Darwin window also starts and presents frames without a diagnostic.
This exposed and corrected missing firmware affine-scale initialization, without a game-specific patch.
Frame-based scenarios and the preparation adapter now make the result repeatable.
A local Emerald run now passes its initial all-device reset, master sound enable, and both PSG pulse triggers.
It stops at a noise channel 4 trigger. The core has tested Direct Sound and both pulse channels.
A continuous sample stream and desktop audio output remain missing.
See [the runtime result](research/emerald-reset.md). Remaining PSG channels are the next demonstrated startup requirement.
A local Emerald run now passes its initial all-device reset, master sound enable, and pulse/noise triggers.
It stops at GPIO serial interrupt control. The core has tested Direct Sound, both pulse channels, and noise channel 4.
Wave channel 3, a continuous sample stream, and desktop audio output remain missing.
See [the runtime result](research/emerald-reset.md). Serial control-register semantics are the next demonstrated startup requirement.
The separate save requirement remains cartridge SRAM, followed by safe host save persistence.
SRAM is byte-addressable battery-backed save memory. Flash and EEPROM remain separate protocols.