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Simulates key press to format internal ram instead of using a rom patch. (nw)

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This commit is contained in:
smf- 2014-01-27 22:42:33 +00:00
parent aedda1342c
commit 0a69cdbe34
1 changed files with 15 additions and 6 deletions
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21
src/mess/drivers/clcd.c
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@ -50,6 +50,7 @@ public:
m_key_poll(0),
m_key_column(0),
m_key_shift(0),
m_key_force_format(0),
m_col0(*this, "COL0"),
m_col1(*this, "COL1"),
m_col2(*this, "COL2"),
@ -449,6 +450,13 @@ public:
m_key_shift |= read_column(i) << 8;
}
}
if (m_key_force_format)
{
m_key_shift = 0x15; // Simulate holding CBM+SHIFT+STOP if you have no NVRAM
m_key_force_format--;
}
}
}
}
@ -484,6 +492,11 @@ public:
return m_ram;
}
void force_format()
{
m_key_force_format = 10;
}
private:
required_device<cpu_device> m_maincpu;
required_device<via6522_device> m_via0;
@ -509,6 +522,7 @@ private:
int m_key_poll;
int m_key_column;
UINT16 m_key_shift;
int m_key_force_format;
required_ioport m_col0;
required_ioport m_col1;
required_ioport m_col2;
@ -534,12 +548,7 @@ static NVRAM_HANDLER(clcd)
}
else
{
// leave whatever ram device defaulted to
//// HACK: this forces ram to be initialised
UINT8 *ROM = state->memregion("maincpu")->base();
ROM[0x185bb] = 0xea;
ROM[0x185bc] = 0xea;
state->force_format();
}
}