diff options
Diffstat (limited to 'src/emu/bus/msx_cart/rtype.c')
-rw-r--r-- | src/emu/bus/msx_cart/rtype.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/emu/bus/msx_cart/rtype.c b/src/emu/bus/msx_cart/rtype.c new file mode 100644 index 00000000000..25c1ec18f89 --- /dev/null +++ b/src/emu/bus/msx_cart/rtype.c @@ -0,0 +1,77 @@ +#include "emu.h" +#include "rtype.h" + +const device_type MSX_CART_RTYPE = &device_creator<msx_cart_rtype>; + + +msx_cart_rtype::msx_cart_rtype(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_RTYPE, "MSX Cartridge - R-Type", tag, owner, clock, "msx_cart_rtype", __FILE__) + , msx_cart_interface(mconfig, *this) + , m_selected_bank(0) +{ + for (int i = 0; i < 2; i++) + { + m_bank_base[i] = NULL; + } +} + + +void msx_cart_rtype::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_rtype::restore_banks), this)); +} + + +void msx_cart_rtype::restore_banks() +{ + m_bank_base[0] = get_rom_base() + 15 * 0x4000; + if (m_selected_bank & 0x10) + { + m_selected_bank &= 0x17; + } + m_bank_base[1] = get_rom_base() + m_selected_bank * 0x4000; +} + + +void msx_cart_rtype::device_reset() +{ + m_selected_bank = 15; +} + + +void msx_cart_rtype::initialize_cartridge() +{ + if ( get_rom_size() != 0x80000 && get_rom_size() != 0x60000 ) + { + fatalerror("rtype: Invalid ROM size\n"); + } + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_rtype::read_cart) +{ + if (offset >= 0x4000 && offset < 0xc000) + { + return m_bank_base[offset >> 15][offset & 0x3fff]; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_rtype::write_cart) +{ + if (offset >= 0x7000 && offset < 0x8000) + { + m_selected_bank = data & 0x1f; + if (m_selected_bank & 0x10) + { + m_selected_bank &= 0x17; + } + m_bank_base[1] = get_rom_base() + m_selected_bank * 0x4000; + } +} + |