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Guard against access to unset harddisk

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This commit is contained in:
Michael Zapf 2015-09-21 00:52:47 +02:00
parent 719356ef47
commit 5907192555
1 changed files with 19 additions and 3 deletions
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22
src/devices/machine/hdc92x4.c
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@ -3716,7 +3716,16 @@ void hdc92x4_device::checkpoint()
bool hdc92x4_device::read_from_mfmhd(const attotime &limit)
{
UINT16 data = 0;
bool offlimit = m_harddisk->read(m_live_state.time, limit, data);
bool offlimit = false;
if (m_harddisk != NULL)
{
offlimit = m_harddisk->read(m_live_state.time, limit, data);
}
else
{
data = 0;
}
// We have reached the time limit
if (offlimit) return true;
@ -3785,7 +3794,7 @@ bool hdc92x4_device::write_to_mfmhd(const attotime &limit)
{
UINT16 data = 0;
int count;
bool offlimit;
bool offlimit = false;
if (m_hd_encoding == MFM_BITS)
{
@ -3798,7 +3807,12 @@ bool hdc92x4_device::write_to_mfmhd(const attotime &limit)
data = m_live_state.shift_reg;
count = 16;
}
offlimit = m_harddisk->write(m_live_state.time, limit, data, m_precompensation != 0, m_reduced_write_current);
if (m_harddisk != NULL)
{
offlimit = m_harddisk->write(m_live_state.time, limit, data, m_precompensation != 0, m_reduced_write_current);
}
if (offlimit) return true;
m_live_state.bit_counter -= count;
@ -4417,6 +4431,8 @@ void hdc92x4_device::device_reset()
m_executing = false;
m_event_line = UNDEF;
m_first_sector_found = false;
m_floppy = NULL;
m_harddisk = NULL;
m_initialized = true;
m_line_level = CLEAR_LINE;
m_live_state.state = IDLE;