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atapihle.cpp: try to fix a problem when m_buffer_size is not a multiple of sector size (nw)

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When reading sectors using the packet command, if the "Byte count limit" is not a multiple
of the sector size, only a subset of the data will be transferred. It happens sometimes with
the xbox.
This commit is contained in:
yz70s 2016-01-17 12:53:31 +01:00
parent 43c5d3509a
commit da0c958f2b
1 changed files with 6 additions and 2 deletions
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8
src/devices/machine/atapihle.cpp
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@ -97,9 +97,13 @@ void atapi_hle_device::fill_buffer()
{
m_buffer_size = m_data_size;
}
else if (m_buffer_size & 1)
else
{
m_buffer_size--;
if (m_buffer_size & 1)
m_buffer_size--;
// if it is transferring less than the remaining data, make sure the size is a multiple of the sector size, otherwise data will be lost
if (m_buffer_size % m_sector_bytes)
m_buffer_size = m_buffer_size - (m_buffer_size % m_sector_bytes);
}
m_cylinder_low = m_buffer_size & 0xff;