diff options
Diffstat (limited to 'src/devices/bus/msx_cart/majutsushi.c')
-rw-r--r-- | src/devices/bus/msx_cart/majutsushi.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/devices/bus/msx_cart/majutsushi.c b/src/devices/bus/msx_cart/majutsushi.c new file mode 100644 index 00000000000..6c9c16e7319 --- /dev/null +++ b/src/devices/bus/msx_cart/majutsushi.c @@ -0,0 +1,115 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "majutsushi.h" + +const device_type MSX_CART_MAJUTSUSHI = &device_creator<msx_cart_majutsushi>; + + +msx_cart_majutsushi::msx_cart_majutsushi(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_MAJUTSUSHI, "MSX Cartridge - Majutsushi", tag, owner, clock, "msx_cart_majutsushi", __FILE__) + , msx_cart_interface(mconfig, *this) + , m_dac(*this, "dac") +{ + for (int i = 0; i < 4; i++) + { + m_selected_bank[i] = 0; + } + for (int i = 0; i < 8; i++) + { + m_bank_base[i] = NULL; + } +} + + +static MACHINE_CONFIG_FRAGMENT( majutsushi ) + // This is actually incorrect. The sound output is passed back into the MSX machine where it is mixed internally and output through the system 'speaker'. + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD("dac", DAC, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.10) +MACHINE_CONFIG_END + + +machine_config_constructor msx_cart_majutsushi::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( majutsushi ); +} + + +void msx_cart_majutsushi::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_majutsushi::restore_banks), this)); +} + + +void msx_cart_majutsushi::restore_banks() +{ + m_bank_base[0] = get_rom_base() + ( m_selected_bank[0] & 0x0f ) * 0x2000; + m_bank_base[1] = get_rom_base() + ( m_selected_bank[1] & 0x0f ) * 0x2000; + m_bank_base[2] = get_rom_base() + ( m_selected_bank[0] & 0x0f ) * 0x2000; + m_bank_base[3] = get_rom_base() + ( m_selected_bank[1] & 0x0f ) * 0x2000; + m_bank_base[4] = get_rom_base() + ( m_selected_bank[2] & 0x0f ) * 0x2000; + m_bank_base[5] = get_rom_base() + ( m_selected_bank[3] & 0x0f ) * 0x2000; + m_bank_base[6] = get_rom_base() + ( m_selected_bank[2] & 0x0f ) * 0x2000; + m_bank_base[7] = get_rom_base() + ( m_selected_bank[3] & 0x0f ) * 0x2000; +} + + +void msx_cart_majutsushi::device_reset() +{ + for (int i = 0; i < 4; i++) + { + m_selected_bank[i] = i; + } +} + + +void msx_cart_majutsushi::initialize_cartridge() +{ + if ( get_rom_size() != 0x20000 ) + { + fatalerror("majutsushi: Invalid ROM size\n"); + } + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_majutsushi::read_cart) +{ + return m_bank_base[offset >> 13][offset & 0x1fff]; +} + + +WRITE8_MEMBER(msx_cart_majutsushi::write_cart) +{ + switch (offset & 0xe000) + { + case 0x4000: + if (offset & 0x1000) + { + m_dac->write_unsigned8(data); + } + break; + + case 0x6000: + m_selected_bank[1] = data & 0x0f; + m_bank_base[1] = get_rom_base() + m_selected_bank[1] * 0x2000; + m_bank_base[3] = get_rom_base() + m_selected_bank[1] * 0x2000; + break; + + case 0x8000: + m_selected_bank[2] = data & 0x0f; + m_bank_base[4] = get_rom_base() + m_selected_bank[2] * 0x2000; + m_bank_base[6] = get_rom_base() + m_selected_bank[2] * 0x2000; + break; + + case 0xa000: + m_selected_bank[3] = data & 0x0f; + m_bank_base[5] = get_rom_base() + m_selected_bank[3] * 0x2000; + m_bank_base[7] = get_rom_base() + m_selected_bank[3] * 0x2000; + break; + } +} |