diff options
Diffstat (limited to 'src/devices/bus/msx_cart/super_swangi.cpp')
-rw-r--r-- | src/devices/bus/msx_cart/super_swangi.cpp | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/devices/bus/msx_cart/super_swangi.cpp b/src/devices/bus/msx_cart/super_swangi.cpp new file mode 100644 index 00000000000..61dffe0d567 --- /dev/null +++ b/src/devices/bus/msx_cart/super_swangi.cpp @@ -0,0 +1,72 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "super_swangi.h" + + +const device_type MSX_CART_SUPER_SWANGI = &device_creator<msx_cart_super_swangi>; + + +msx_cart_super_swangi::msx_cart_super_swangi(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_SUPER_SWANGI, "MSX Cartridge - Super Swangi", tag, owner, clock, "msx_cart_super_swangi", __FILE__) + , msx_cart_interface(mconfig, *this) + , m_selected_bank(0) +{ + m_bank_base[0] = m_bank_base[1] = NULL; +} + + +void msx_cart_super_swangi::device_start() +{ + save_item(NAME(m_selected_bank)); + + machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_super_swangi::restore_banks), this)); +} + + +void msx_cart_super_swangi::restore_banks() +{ + m_bank_base[0] = get_rom_base(); + m_bank_base[1] = get_rom_base() + (((m_selected_bank >> 1) * 0x4000) & 0xffff); +} + + +void msx_cart_super_swangi::device_reset() +{ + m_selected_bank = 0; +} + + +void msx_cart_super_swangi::initialize_cartridge() +{ + if (get_rom_size() < 0x10000) + { + fatalerror("rtype: Invalid ROM size\n"); + } + + restore_banks(); +} + + +READ8_MEMBER(msx_cart_super_swangi::read_cart) +{ + if (offset >= 0x4000 && offset < 0xc000) + { + return m_bank_base[offset >> 15][offset & 0x3fff]; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_super_swangi::write_cart) +{ + if (offset == 0x8000) + { + m_selected_bank = data; + restore_banks(); + } + else + { + logerror("msx_cart_super_swangi: unhandled write %02x to %04x\n", data, offset); + } +} |