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amstrad.c: worked around gx4000 crash (nw)

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This commit is contained in:
Osso 2015-05-15 07:51:13 +02:00
parent 241f3e61f9
commit 9ecb89981f
1 changed files with 10 additions and 5 deletions
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15
src/mess/machine/amstrad.c
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@ -1658,10 +1658,14 @@ Bit 4 controls the interrupt generation. It can be used to delay interrupts.*/
}
/* b3b2 != 0 then change the state of upper or lower rom area and rethink memory */
if((dataToGateArray & 0x0c) != 0)
m_exp->romen_w(0); // active low
else
m_exp->romen_w(1);
if (m_exp)
{
if((dataToGateArray & 0x0c) != 0)
m_exp->romen_w(0); // active low
else
m_exp->romen_w(1);
}
amstrad_setLowerRom();
amstrad_setUpperRom();
@ -2385,7 +2389,8 @@ void amstrad_state::amstrad_rethinkMemory()
}
/* mappings for other expansion devices */
m_exp->set_mapping();
if (m_exp)
m_exp->set_mapping();
}