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qvt70: Slight banking adjustment, add more RAM (nw)

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This commit is contained in:
Dirk Best 2019-10-16 10:52:18 +02:00
parent 15fa792f66
commit 665d4fc98c
1 changed files with 15 additions and 11 deletions
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26
src/mame/drivers/qvt70.cpp
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@ -54,7 +54,7 @@ private:
void bank_map(address_map &map);
void io_map(address_map &map);
DECLARE_WRITE8_MEMBER(bankswitch_w);
void bankswitch_w(uint8_t data);
};
void qvt70_state::mem_map(address_map &map)
@ -62,7 +62,8 @@ void qvt70_state::mem_map(address_map &map)
map(0x0000, 0x7fff).m(m_bank, FUNC(address_map_bank_device::amap8));
map(0x8000, 0x8000).w(FUNC(qvt70_state::bankswitch_w));
map(0xa000, 0xbfff).ram();
// map(0xc000, 0xffff).ram();
map(0xc000, 0xdfff).ram();
map(0xe000, 0xffff).ram();
}
void qvt70_state::bank_map(address_map &map)
@ -88,21 +89,24 @@ void qvt70_state::io_map(address_map &map)
static INPUT_PORTS_START( qvt70 )
INPUT_PORTS_END
WRITE8_MEMBER(qvt70_state::bankswitch_w)
void qvt70_state::bankswitch_w(uint8_t data)
{
logerror("bankswitch_w: %02x\n", data);
// 765----- unknown
// ---43--- bankswitching?
// ---43--- bankswitching
// -----21- unknown
// -------0 bankswitching?
// -------0 bankswitching
// likely wrong
int bank = ((data >> 2) & 0x06) | BIT(data, 0);
logerror("bank = %02x\n", bank);
if (bank < 6)
m_bank->set_bank(bank);
switch (data & 0x19)
{
case 0x00: m_bank->set_bank(0); break;
case 0x08: m_bank->set_bank(1); break;
case 0x10: m_bank->set_bank(2); break;
case 0x18: m_bank->set_bank(3); break;
case 0x01: m_bank->set_bank(4); break;
case 0x11: m_bank->set_bank(5); break;
}
}
void qvt70_state::machine_start()