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c140: Rework interrupt timing and fix regression (nw)

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This commit is contained in:
AJR 2019-09-06 18:17:31 -04:00
parent 51f4699fda
commit 6eb37a7714
1 changed files with 14 additions and 7 deletions
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21
src/devices/sound/c140.cpp
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@ -444,23 +444,30 @@ void c140_device::c140_w(offs_t offset, u8 data)
}
}
}
else if (offset == 0x1f8 || offset == 0x1fe)
else if (offset == 0x1fa)
{
m_int1_callback(CLEAR_LINE);
// timing not verified
unsigned div = m_REG[0x1f8] != 0 ? m_REG[0x1f8] : 256;
attotime interval = attotime::from_ticks(div * 2, m_baserate);
if (BIT(m_REG[0x1fe], 0))
m_int1_timer->adjust(interval, 0, interval);
m_int1_timer->adjust(interval);
}
else if (offset == 0x1fe)
{
if (BIT(data, 0))
{
// kyukaidk and marvlandj want the first interrupt to happen immediately
if (!m_int1_timer->enabled())
m_int1_callback(ASSERT_LINE);
}
else
{
m_int1_callback(CLEAR_LINE);
m_int1_timer->adjust(attotime::never);
m_int1_timer->enable(false);
}
}
else if (offset == 0x1fa)
{
m_int1_callback(CLEAR_LINE);
}
}