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ym2151: Emulate reset line

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This commit is contained in:
AJR 2017-07-26 18:06:40 -04:00
parent 358c9eb09f
commit a85ee9046d
2 changed files with 20 additions and 5 deletions
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24
src/devices/sound/ym2151.cpp
View File

@ -1021,6 +1021,8 @@ void ym2151_device::device_start()
save_item(NAME(irqlinestate));
save_item(NAME(connect));
save_item(NAME(m_reset_active));
}
void ym2151_device::device_clock_changed()
@ -1664,7 +1666,8 @@ ym2151_device::ym2151_device(const machine_config &mconfig, const char *tag, dev
m_stream(nullptr),
m_lastreg(0),
m_irqhandler(*this),
m_portwritehandler(*this)
m_portwritehandler(*this),
m_reset_active(false)
{
}
@ -1693,8 +1696,11 @@ WRITE8_MEMBER( ym2151_device::write )
{
if (offset & 1)
{
m_stream->update();
write_reg(m_lastreg, data);
if (!m_reset_active)
{
m_stream->update();
write_reg(m_lastreg, data);
}
}
else
m_lastreg = data;
@ -1779,9 +1785,11 @@ void ym2151_device::device_reset()
WRITE_LINE_MEMBER(ym2151_device::reset_w)
{
// FIXME: not accurate behavior
if (!state)
// active low reset
if (!m_reset_active && !state)
reset();
m_reset_active = !state;
}
@ -1791,6 +1799,12 @@ WRITE_LINE_MEMBER(ym2151_device::reset_w)
void ym2151_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
if (m_reset_active)
{
std::fill(&outputs[0][0], &outputs[0][samples], 0);
return;
}
for (int i=0; i<samples; i++)
{
advance_eg();

1
src/devices/sound/ym2151.h
View File

@ -260,6 +260,7 @@ private:
uint8_t m_lastreg;
devcb_write_line m_irqhandler;
devcb_write8 m_portwritehandler;
bool m_reset_active;
void init_tables();
void calculate_timers();