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(MESS) sms: fixed crash with gamegear games accessing not available controller ports, from Enik. nw.

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This commit is contained in:
Fabio Priuli 2013-06-25 06:22:43 +00:00
parent 87f06ab1ff
commit 0c487555d4
1 changed files with 8 additions and 6 deletions
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14
src/mess/machine/sms.c
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@ -117,10 +117,11 @@ WRITE8_MEMBER(sms_state::sms_io_control_w)
// check if TH is set to input (1).
if (data & 0x02)
{
UINT8 th_level = (m_port_ctrl1->port_r() & 0x40) >> 1;
if (!m_is_gamegear)
ctrl1_port_data &= ~0x40 | m_port_ctrl1->port_r();
// check if TH pin level is high (1) and was low (0)
if ((th_level & 0x20) && !(m_io_ctrl_reg & 0x20))
// check if TH input level is high (1) and was output/low (0)
if ((ctrl1_port_data & 0x40) && !(m_io_ctrl_reg & 0x22))
latch_hcount = true;
}
@ -143,10 +144,11 @@ WRITE8_MEMBER(sms_state::sms_io_control_w)
// check if TH is set to input (1).
if (data & 0x08)
{
UINT8 th_level = (m_port_ctrl2->port_r() & 0x40) << 1;
if (!m_is_gamegear)
ctrl2_port_data &= ~0x40 | m_port_ctrl2->port_r();
// check if TH pin level is high (1) and was low (0)
if ((th_level & 0x80) && !(m_io_ctrl_reg & 0x80))
// check if TH input level is high (1) and was output/low (0)
if ((ctrl2_port_data & 0x40) && !(m_io_ctrl_reg & 0x88))
latch_hcount = true;
}