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atari_s2: fixed sound clipping

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This commit is contained in:
Robbbert 2014-08-27 13:11:44 +00:00
parent 53800034fc
commit 9259a92329
1 changed files with 11 additions and 6 deletions
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17
src/mame/drivers/atari_s2.c
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@ -47,7 +47,6 @@ public:
TIMER_DEVICE_CALLBACK_MEMBER(timer_s);
private:
bool m_timer_sb;
bool m_ab1;
UINT8 m_timer_s[5];
UINT8 m_sound0;
UINT8 m_sound1;
@ -387,11 +386,17 @@ TIMER_DEVICE_CALLBACK_MEMBER( atari_s2_state::timer_s )
// noise
if BIT(m_sound0, 7)
{
m_timer_s[3] = (m_timer_s[3] << 1) | m_ab1;
m_timer_s[4] = (m_timer_s[4] << 1) | !BIT(m_timer_s[3], 1);
m_ab1 = BIT(m_timer_s[3], 0) ^ BIT(m_timer_s[4], 6);
bool ab0 = BIT(m_timer_s[3], 0) ^ BIT(m_timer_s[4], 6);
bool ab1 = !BIT(m_timer_s[3], 1);
m_timer_s[3] = (m_timer_s[3] << 1) | ab0;
m_timer_s[4] = (m_timer_s[4] << 1) | ab1;
m_dac1->write_unsigned8((m_timer_s[4] & 7)<< 5);
}
else
{
m_timer_s[3] = 0;
m_timer_s[4] = 0;
}
}
}
}
@ -452,9 +457,9 @@ static MACHINE_CONFIG_START( atari_s2, atari_s2_state )
MCFG_FRAGMENT_ADD( genpin_audio )
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD("dac", DAC, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.60)
MCFG_SOUND_ADD("dac1", DAC, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.60)
/* Video */
MCFG_DEFAULT_LAYOUT(layout_atari_s2)