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Merge pull request #416 from grauw/ay8930-fix2

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AY8930: Fix tone and noise period in expanded mode.
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tildearrow 2022-05-03 16:51:50 -05:00 • committed by GitHub
commit 391928af6e
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2 changed files with 6 additions and 6 deletions
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8
src/engine/platform/sound/ay8910.cpp
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@ -1064,7 +1064,7 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
{
tone = &m_tone[chan];
const int period = std::max<int>(1,tone->period);
tone->count += is_expanded_mode() ? 16 : 1;
tone->count += is_expanded_mode() ? 16 : (m_feature & PSG_HAS_EXPANDED_MODE) ? 2 : 1;
while (tone->count >= period)
{
tone->duty_cycle = (tone->duty_cycle - 1) & 0x1f;
@ -1080,7 +1080,7 @@ void ay8910_device::sound_stream_update(short** outputs, int outLen)
* channels.
*/
m_count_noise = 0;
m_prescale_noise ^= 1;
m_prescale_noise = (m_prescale_noise + 1) & ((m_feature & PSG_HAS_EXPANDED_MODE) ? 3 : 1);
if (!m_prescale_noise || is_expanded_mode()) // AY8930 noise generator rate is twice compares as compatibility mode
{
@ -1469,7 +1469,7 @@ ay8910_device::ay8910_device(device_type type, unsigned int clock,
m_noise_latch(0),
m_mode(0),
m_env_step_mask((!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 0x0f : 0x1f),
m_step( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 2 : 1),
m_step( (feature & PSG_HAS_EXPANDED_MODE) || (psg_type == PSG_TYPE_AY) ? 2 : 1),
m_zero_is_off( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? 1 : 0),
m_par( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? &ay8910_param : &ym2149_param),
m_par_env( (!(feature & PSG_HAS_EXPANDED_MODE)) && (psg_type == PSG_TYPE_AY) ? &ay8910_param : &ym2149_param_env),
@ -1502,7 +1502,7 @@ void ay8910_device::set_type(psg_type_t psg_type)
else
{
m_env_step_mask = 0x1f;
m_step = 1;
m_step = (m_feature & PSG_HAS_EXPANDED_MODE) ? 2 : 1;
m_zero_is_off = 0;
m_par = &ym2149_param;
m_par_env = &ym2149_param_env;