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(MESS) ti99: Forgotten null check. (nw)

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This commit is contained in:
Michael Zapf 2015-04-21 15:15:30 +02:00
parent a0054fed49
commit 30523ddcd0
1 changed files with 9 additions and 5 deletions
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14
src/emu/bus/ti99_peb/hfdc.c
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@ -578,16 +578,20 @@ void myarc_hfdc_device::signal_drive_status()
{
if ((m_output1_latch & 0xe0)!=0)
{
if (m_current_harddisk->ready_r()==ASSERT_LINE)
if (m_current_harddisk != NULL)
{
m_status_latch |= HDC_DS_READY;
set_bits(m_status_latch, HDC_DS_SKCOM, m_current_harddisk->seek_complete_r()==ASSERT_LINE);
set_bits(m_status_latch, HDC_DS_TRK00, m_current_harddisk->trk00_r()==ASSERT_LINE);
if (m_current_harddisk->ready_r()==ASSERT_LINE)
{
m_status_latch |= HDC_DS_READY;
set_bits(m_status_latch, HDC_DS_SKCOM, m_current_harddisk->seek_complete_r()==ASSERT_LINE);
set_bits(m_status_latch, HDC_DS_TRK00, m_current_harddisk->trk00_r()==ASSERT_LINE);
}
}
// If WDS is selected but not connected, WDS.ready* and WDS.seekComplete* are 1, so Ready=SeekComplete=0
else set_bits(m_status_latch, HDC_DS_READY | HDC_DS_SKCOM, false);
}
}
// If WDS is selected but not connected, WDS.ready* and WDS.seekComplete* are 1, so Ready=SeekComplete=0
reply |= m_status_latch;
m_hdc9234->auxbus_in(reply);