diff options
Diffstat (limited to 'src/devices/bus/msx/cart/dooly.cpp')
-rw-r--r-- | src/devices/bus/msx/cart/dooly.cpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/devices/bus/msx/cart/dooly.cpp b/src/devices/bus/msx/cart/dooly.cpp new file mode 100644 index 00000000000..24a12a98b1a --- /dev/null +++ b/src/devices/bus/msx/cart/dooly.cpp @@ -0,0 +1,90 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "dooly.h" + +namespace { + +class msx_cart_dooly_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_dooly_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_CART_DOOLY, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_view1(*this, "view1") + , m_view2(*this, "view2") + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override { } + virtual void device_reset() override; + +private: + void prot_w(u8 data); + u8 mode4_page1_r(offs_t offset); + u8 mode4_page2_r(offs_t offset); + + memory_view m_view1; + memory_view m_view2; +}; + +void msx_cart_dooly_device::device_reset() +{ + m_view1.select(0); + m_view2.select(0); +} + +std::error_condition msx_cart_dooly_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_dooly_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + if (cart_rom_region()->bytes() != 0x8000) + { + message = "msx_cart_dooly_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + page(1)->install_view(0x4000, 0x7fff, m_view1); + m_view1[0].install_rom(0x4000, 0x7fff, cart_rom_region()->base()); + m_view1[1].install_read_handler(0x4000, 0x7fff, emu::rw_delegate(*this, FUNC(msx_cart_dooly_device::mode4_page1_r))); + page(2)->install_view(0x8000, 0xbfff, m_view2); + m_view2[0].install_rom(0x8000, 0xbfff, cart_rom_region()->base() + 0x4000); + m_view2[1].install_read_handler(0x8000, 0xbfff, emu::rw_delegate(*this, FUNC(msx_cart_dooly_device::mode4_page2_r))); + + page(1)->install_write_handler(0x4000, 0x7fff, emu::rw_delegate(*this, FUNC(msx_cart_dooly_device::prot_w))); + page(2)->install_write_handler(0x8000, 0xbfff, emu::rw_delegate(*this, FUNC(msx_cart_dooly_device::prot_w))); + + return std::error_condition(); +} + +u8 msx_cart_dooly_device::mode4_page1_r(offs_t offset) +{ + return bitswap<8>(cart_rom_region()->base()[offset], 7, 6, 5, 4, 3, 1, 0, 2); +} + +u8 msx_cart_dooly_device::mode4_page2_r(offs_t offset) +{ + return bitswap<8>(cart_rom_region()->base()[0x4000 | offset], 7, 6, 5, 4, 3, 1, 0, 2); +} + +void msx_cart_dooly_device::prot_w(u8 data) +{ + data &= 0x07; + m_view1.select(BIT(data, 2) ? 1 : 0); + m_view2.select(BIT(data, 2) ? 1 : 0); + if (data != 0 && data != 4) + { + logerror("msx_cart_dooly_device: unhandled protection mode %02x\n", data); + } +} + +} // anonymous namespace + +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_DOOLY, msx_cart_interface, msx_cart_dooly_device, "msx_cart_dooly", "MSX Cartridge - Dooly") |