![]() ![]() In this case, if the length counter was PREVIOUSLY disabled and now enabled and the length counter is not zero, it is decremented. Extra length clocking occurs when writing to NRx4 when the frame sequencer's next step is one that doesn't clock the length counter. ![]() When triggering a square channel, the low two bits of the frequency timer are NOT modified.The first nibble from the wave table is thus not played until the waveform loops. This is because it doesn't load the first byte on trigger like it 'should'. When triggering the wave channel, the first sample to play is the previous one still in the high nibble of the sample buffer, and the next sample is the second nibble from the wave table.Also, the square duty sequence clocking is disabled until the first trigger. Just after powering on, the first duty step of the square waves after they are triggered for the first time is played as if it were 0.The volume envelope and sweep timers treat a period of 0 as 8.When nothing is connected to Vin, it naturally floats at the middle voltage (silence). On the CGB, the range is 1.920 volts to 2.740 volts, a quarter of the DMG range, thus sound fed to the CGB's Vin is significantly louder. On the DMG and MGB, 0.847 volts gives equivalent to 0 on a channel DAC, and 3.710 volts is equivalent to 15 on a DAC, with other values linearly distributed between those voltages. When enabled via NR50, it is mixed in before the master volume controls. The cartridge connector includes a sound input called Vin. ![]()
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