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feat(audio): implement PSG noise channel 4

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0xrsydn 2026-10-07 02:51:46 +07:00
commit 8ae7b3cf72
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docs/hardware/timers-irq.md
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@ -39,7 +39,7 @@ Failed steps discard staged counters, divider progress, timer/audio writes, FIFO
Display and other device clocks then advance once, without advancing timers again.
Display and remaining devices still use the bulk scheduler. Mid-instruction display events, general bus arbitration, and IRQ synchronization delays remain unmodeled.
[Direct Sound](audio.md) consumes selected timer overflows in the timer transaction; sound DMA requests commit at step boundaries.
The same transaction advances both PSG pulse oscillators and their shared 512 Hz sequencer independently of the general-purpose timers.
The same transaction advances both PSG pulse oscillators, the noise counter, and their shared 512 Hz sequencer independently of the general-purpose timers.
Host clock advances and HALT idle batches retain ordinary bulk timer advancement; STOP idle does not advance timers.
The unchanged [prefetch cancellation probe](../research/prefetch-cancellation.md) now matches both published interval totals and actual timer samples.