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pc9801_86: fix dangel no voice and policenauts choppy audio (nw)

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This commit is contained in:
cracyc 2018-04-25 16:35:01 -05:00
parent 37ae0dbcdf
commit 58d845364a
2 changed files with 11 additions and 8 deletions
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17
src/devices/bus/cbus/pc9801_86.cpp
View File

@ -170,6 +170,9 @@ void pc9801_86_device::install_device(offs_t start, offs_t end, read8_delegate r
void pc9801_86_device::device_start()
{
m_dac_timer = timer_alloc();
save_item(NAME(m_count));
save_item(NAME(m_queue));
save_item(NAME(m_irq_rate));
}
@ -187,7 +190,7 @@ void pc9801_86_device::device_reset()
write8_delegate([this](address_space &s, offs_t o, u8 d, u8 mm){ if(o == 2) m_pcm_mute = d; }, "pc9801_86_mute_w"));
m_mask = 0;
m_head = m_tail = m_count = 0;
m_fmirq = m_pcmirq = false;
m_fmirq = m_pcmirq = m_init = false;
m_irq_rate = 0;
m_pcm_ctrl = m_pcm_mode = 0;
m_pcm_mute = 0;
@ -264,8 +267,8 @@ WRITE8_MEMBER(pc9801_86_device::pcm_w)
m_vol[data >> 5] = data & 0x0f;
break;
case 2:
m_pcm_ctrl = data & ~0x10;
m_dac_timer->adjust(attotime::from_ticks(divs[data & 7], rate), 0, attotime::from_ticks(divs[data & 7], rate));
if(((data & 7) != (m_pcm_ctrl & 7)) || !m_init)
m_dac_timer->adjust(attotime::from_ticks(divs[data & 7], rate), 0, attotime::from_ticks(divs[data & 7], rate));
if(data & 8)
m_head = m_tail = m_count = 0;
if(!(data & 0x10))
@ -273,6 +276,8 @@ WRITE8_MEMBER(pc9801_86_device::pcm_w)
m_pcmirq = false;
machine().device<pic8259_device>(":pic8259_slave")->ir4_w(m_fmirq ? ASSERT_LINE : CLEAR_LINE);
}
m_init = true;
m_pcm_ctrl = data & ~0x10;
break;
case 3:
if(m_pcm_ctrl & 0x20)
@ -301,11 +306,9 @@ int pc9801_86_device::queue_count()
uint8_t pc9801_86_device::queue_pop()
{
if(!queue_count())
return 0;
uint8_t ret = m_queue[m_tail++];
m_tail %= QUEUE_SIZE;
m_count--;
m_count = (m_count - 1) % QUEUE_SIZE; // dangel resets the fifo after filling it completely so maybe it expects an underflow
return ret;
}
@ -314,7 +317,7 @@ void pc9801_86_device::device_timer(emu_timer& timer, device_timer_id id, int pa
int16_t lsample, rsample;
m_pcm_clk = !m_pcm_clk;
if((m_pcm_ctrl & 0x40) || !(m_pcm_ctrl & 0x80) || !queue_count())
if((m_pcm_ctrl & 0x40) || !(m_pcm_ctrl & 0x80))
return;
switch(m_pcm_mode & 0x70)

2
src/devices/bus/cbus/pc9801_86.h
View File

@ -55,7 +55,7 @@ private:
uint8_t m_joy_sel, m_mask, m_pcm_mode, m_vol[7], m_pcm_ctrl, m_pcm_mute;
uint16_t m_head, m_tail, m_count, m_irq_rate;
bool m_pcmirq, m_fmirq, m_pcm_clk;
bool m_pcmirq, m_fmirq, m_pcm_clk, m_init;
required_device<ym2608_device> m_opna;
required_device<dac_word_interface> m_ldac;
required_device<dac_word_interface> m_rdac;