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Gameboy: add correct M161 implementation

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Signed-off-by: Tauwasser <tauwasser@tauwasser.eu>
This commit is contained in:
Tauwasser 2016-05-24 12:40:58 +02:00
parent 765f625779
commit 9cadcbf829
3 changed files with 15 additions and 10 deletions
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2
hash/gameboy.xml
View File

@ -11917,7 +11917,7 @@
</part>
</software>
<software name="4in1_601" supported="no">
<software name="4in1_601">
<description>Mani 4 in 1 (Chi, DMG-601 CHN)</description>
<year>19??</year>
<publisher>Mani</publisher>

22
src/devices/bus/gameboy/mbc.cpp
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@ -88,7 +88,7 @@ gb_rom_mbc7_device::gb_rom_mbc7_device(const machine_config &mconfig, const char
}
gb_rom_m161_device::gb_rom_m161_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: gb_rom_mbc_device(mconfig, GB_ROM_M161, "GB M161 Carts", tag, owner, clock, "gb_rom_m161", __FILE__), m_base_bank(0)
: gb_rom_mbc_device(mconfig, GB_ROM_M161, "GB M161 Carts", tag, owner, clock, "gb_rom_m161", __FILE__), m_base_bank(0), m_load_disable(0)
{
}
@ -217,12 +217,14 @@ void gb_rom_m161_device::device_start()
{
shared_start();
save_item(NAME(m_base_bank));
save_item(NAME(m_load_disable));
}
void gb_rom_m161_device::device_reset()
{
shared_reset();
m_base_bank = 0;
m_load_disable = 0;
}
void gb_rom_mmm01_device::device_start()
@ -668,20 +670,22 @@ WRITE8_MEMBER(gb_rom_mbc7_device::write_ram)
READ8_MEMBER(gb_rom_m161_device::read_rom)
{
if (offset < 0x4000)
return m_rom[rom_bank_map[m_base_bank] * 0x4000 + offset];
else
return m_rom[rom_bank_map[m_base_bank] * 0x4000 + (offset & 0x3fff)];
return m_rom[rom_bank_map[m_base_bank] * 0x4000 + (offset & 0x7fff)];
}
WRITE8_MEMBER(gb_rom_m161_device::write_bank)
{
switch (offset & 0xe000)
// the mapper (74HC161A) only has data lines D2..D0
data &= 0x07;
// A15 is connected to #LOAD and overwritten by QD (m_load_disable)
switch (offset & 0x8000)
{
case 0x4000: // Base Bank Register
m_base_bank = data << 1;
case 0x0000: // Base Bank Register
if (!m_load_disable)
m_base_bank = data << 1;
m_load_disable = 0x01;
break;
case 0x2000: // Tetris writes 1 here when selected...
default:
break;
}

1
src/devices/bus/gameboy/mbc.h
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@ -172,6 +172,7 @@ public:
virtual DECLARE_WRITE8_MEMBER(write_ram) override { }
UINT8 m_base_bank;
UINT8 m_load_disable;
};
// ======================> gb_rom_mmm01_device