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Correct clock rate, triangle wave.

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This commit is contained in:
Thomas Harte
2025-11-10 22:35:13 -05:00
parent 0d295a6338
commit ae2936b9c3
3 changed files with 10 additions and 6 deletions
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5
Components/SID/SID.cpp
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@@ -35,7 +35,10 @@ void SID::write(const Numeric::SizedInt<5> address, const uint8_t value) {
oscillator().pulse_width = (oscillator().pitch & 0xf0'00'00'00) | uint32_t(value << 20);
break;
case 0x03: case 0x0a: case 0x11:
oscillator().pulse_width = (oscillator().pitch & 0x0f'f0'00'00) | uint32_t(value << 28);
// The top bit of the phase counter is inverted; since it'll be compared directly with the
// pulse width, invert that bit too.
oscillator().pulse_width =
((oscillator().pitch & 0x0f'f0'00'00) | uint32_t(value << 28)) ^ 0x8000'0000;
break;
case 0x04: case 0x0b: case 0x12:
voice().control = value;

5
Components/SID/SID.hpp
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@@ -116,8 +116,9 @@ private:
uint16_t triangle_output(const Voice &prior) const {
const uint16_t sawtooth = oscillator.sawtooth();
const uint16_t xor_mask =
((sawtooth ^ (ring_mod() && prior.sawtooth())) & 0x800) ? 0xfff : 0x000;
const uint16_t xor_mask1 = sawtooth;
const uint16_t xor_mask2 = ring_mod() ? prior.sawtooth() : 0;
const uint16_t xor_mask = (xor_mask1 ^ xor_mask2) ? 0xfff : 0x000;
return ((sawtooth << 1) ^ xor_mask) & 0xfff;
}

6
Machines/Acorn/BBCMicro/BBCMicro.cpp
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@@ -128,13 +128,13 @@ private:
public:
Audio() :
sn76489_(TI::SN76489::Personality::SN76489, audio_queue_, 2),
sn76489_(TI::SN76489::Personality::SN76489, audio_queue_, 4),
sid_(audio_queue_),
compound_(sn76489_, sid_),
speaker_(speaker_source())
{
// Combined with the additional divider specified above, implies this chip is clocked at 4Mhz.
speaker_.set_input_rate(2'000'000.0f);
// Combined with the additional divider specified above, implies the SN76489 is clocked at 4Mhz.
speaker_.set_input_rate(1'000'000.0f);
}
~Audio() {