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7200fifo: Allow side effects to be disabled for reads (nw)

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This commit is contained in:
AJR 2019-05-21 01:50:07 -04:00
parent f17e47ecfc
commit 32a962e50c
1 changed files with 21 additions and 17 deletions
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38
src/devices/machine/7200fifo.cpp
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@ -143,30 +143,34 @@ uint16_t fifo7200_device::fifo_read()
{
if (m_ef)
{
logerror("IDT7200 %s fifo_read underflow!\n", tag());
if (!machine().side_effects_disabled())
logerror("IDT7200 %s fifo_read underflow!\n", tag());
return 0x1ff;
}
uint16_t ret = m_buffer[m_read_ptr];
m_read_ptr = (m_read_ptr + 1) % m_ram_size;
// update flags
if (m_ff)
if (!machine().side_effects_disabled())
{
m_ff = 0;
m_ff_handler(!m_ff);
}
m_read_ptr = (m_read_ptr + 1) % m_ram_size;
else if (m_read_ptr == m_write_ptr)
{
m_ef = 1;
m_ef_handler(!m_ef);
}
// update flags
if (m_ff)
{
m_ff = 0;
m_ff_handler(!m_ff);
}
else if (((m_read_ptr + m_ram_size / 2) % m_ram_size) == m_write_ptr)
{
m_hf = 0;
m_hf_handler(!m_hf);
else if (m_read_ptr == m_write_ptr)
{
m_ef = 1;
m_ef_handler(!m_ef);
}
else if (((m_read_ptr + m_ram_size / 2) % m_ram_size) == m_write_ptr)
{
m_hf = 0;
m_hf_handler(!m_hf);
}
}
return ret;