Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-23 00:39:36 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Fixed head incrementing when using CHS with 16 heads (nw)

Browse Source
This commit is contained in:
smf- 2013-06-16 22:45:51 +00:00
parent eb5c9decf4
commit 42d77a2f41
1 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
src/emu/machine/idehd.c
View File

@ -160,7 +160,7 @@ UINT32 ide_mass_storage_device::lba_address()
/* standard CHS */
else
return (((((m_cylinder_high << 8 ) | m_cylinder_low) * m_num_heads) + (m_device_head & IDE_DEVICE_HEAD_HS)) * m_num_sectors) + m_sector_number - 1;
return (((((m_cylinder_high << 8) | m_cylinder_low) * m_num_heads) + (m_device_head & IDE_DEVICE_HEAD_HS)) * m_num_sectors) + m_sector_number - 1;
}
@ -457,6 +457,8 @@ void ide_mass_storage_device::signal_delayed_interrupt(attotime time, int buffer
void ide_mass_storage_device::next_sector()
{
UINT8 cur_head = m_device_head & IDE_DEVICE_HEAD_HS;
/* LBA direct? */
if (m_device_head & IDE_DEVICE_HEAD_L)
{
@ -467,8 +469,8 @@ void ide_mass_storage_device::next_sector()
if (m_cylinder_low == 0)
{
m_cylinder_high++;
if( m_cylinder_high == 0)
m_device_head = (m_device_head & ~IDE_DEVICE_HEAD_HS) | ((m_device_head + 1) & IDE_DEVICE_HEAD_HS);
if (m_cylinder_high == 0)
cur_head++;
}
}
}
@ -482,10 +484,10 @@ void ide_mass_storage_device::next_sector()
{
/* heads are 0 based */
m_sector_number = 1;
m_device_head = (m_device_head & ~IDE_DEVICE_HEAD_HS) | ((m_device_head + 1) & IDE_DEVICE_HEAD_HS);
if ((m_device_head & IDE_DEVICE_HEAD_HS) >= m_num_heads)
cur_head++;
if (cur_head >= m_num_heads)
{
m_device_head &= ~IDE_DEVICE_HEAD_HS;
cur_head = 0;
m_cylinder_low++;
if (m_cylinder_low == 0)
m_cylinder_high++;
@ -493,6 +495,8 @@ void ide_mass_storage_device::next_sector()
}
}
m_device_head = (m_device_head & ~IDE_DEVICE_HEAD_HS) | cur_head;
m_cur_lba = lba_address();
}