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pit8253: fix old regression with mode 3 and odd timer count

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This commit is contained in:
hap 2024-03-23 18:08:58 +01:00
parent 3b57da6177
commit d9788da837
1 changed files with 2 additions and 6 deletions
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8
src/devices/machine/pit8253.cpp
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@ -292,9 +292,6 @@ void pit_counter_device::load_counter_value()
{
m_value = m_count;
m_null_count = 0;
if (CTRL_MODE(m_control) == 3 && m_output == 0)
m_value &= 0xfffe;
}
@ -769,9 +766,8 @@ void pit_counter_device::update()
}
/* We recycle bit 0 of m_value to hold the phase in mode 3 when count is
odd. Since read commands in mode 3 always return even numbers, we need to
mask this bit off. */
/* Since read commands in mode 3 always return even numbers,
we need to mask bit 0 off. */
uint16_t pit_counter_device::masked_value() const
{
if ((CTRL_MODE(m_control) == 3) && (downcast<pit8253_device *>(owner())->m_type != pit_type::FE2010))