diff options
Diffstat (limited to 'src/emu/bus/msx_cart/hfox.c')
-rw-r--r-- | src/emu/bus/msx_cart/hfox.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/emu/bus/msx_cart/hfox.c b/src/emu/bus/msx_cart/hfox.c new file mode 100644 index 00000000000..695845a54e2 --- /dev/null +++ b/src/emu/bus/msx_cart/hfox.c @@ -0,0 +1,78 @@ +#include "emu.h" +#include "hfox.h" + + +const device_type MSX_CART_HFOX = &device_creator<msx_cart_hfox>; + + +msx_cart_hfox::msx_cart_hfox(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_HFOX, "MSX Cartridge - Harry Fox", tag, owner, clock, "msx_cart_hfox", __FILE__) + , msx_cart_interface(mconfig, *this) +{ + m_selected_bank[0] = m_selected_bank[1] = 0; + m_bank_base[0] = m_bank_base[1] = NULL; +} + + +void msx_cart_hfox::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_hfox::restore_banks), this)); +} + + +void msx_cart_hfox::restore_banks() +{ + m_bank_base[0] = get_rom_base() + ((m_selected_bank[0] & 0x01) * 0x8000); + m_bank_base[1] = get_rom_base() + ((m_selected_bank[1] & 0x01) * 0x8000) + 0x4000; +} + + +void msx_cart_hfox::device_reset() +{ + m_selected_bank[0] = m_selected_bank[1] = 0; +} + + +void msx_cart_hfox::initialize_cartridge() +{ + if (get_rom_size() < 0x10000) + { + fatalerror("rtype: Invalid ROM size\n"); + } + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_hfox::read_cart) +{ + if (offset >= 0x4000 && offset < 0xc000) + { + return m_bank_base[offset >> 15][offset & 0x3fff]; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_hfox::write_cart) +{ + switch (offset) + { + case 0x6000: + m_selected_bank[0] = data; + restore_banks(); + break; + + case 0x7000: + m_selected_bank[1] = data; + restore_banks(); + break; + + default: + printf("msx_cart_hfox: unhandled write %02x to %04x\n", data, offset); + break; + } +} + |