diff options
Diffstat (limited to 'src/devices/bus/msx_cart/dooly.cpp')
-rw-r--r-- | src/devices/bus/msx_cart/dooly.cpp | 67 |
1 files changed, 67 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..95f2748b04a --- /dev/null +++ b/src/devices/bus/msx_cart/dooly.cpp @@ -0,0 +1,67 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "dooly.h" + + +const device_type MSX_CART_DOOLY = &device_creator<msx_cart_dooly>; + + +msx_cart_dooly::msx_cart_dooly(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, MSX_CART_DOOLY, "MSX Cartridge - Dooly", tag, owner, clock, "msx_cart_dooly", __FILE__) + , msx_cart_interface(mconfig, *this) + , m_prot(0) +{ +} + + +void msx_cart_dooly::device_start() +{ + save_item(NAME(m_prot)); +} + + +void msx_cart_dooly::device_reset() +{ + m_prot = 0; +} + + +void msx_cart_dooly::initialize_cartridge() +{ + if (get_rom_size() != 0x8000) + { + fatalerror("dooly: Invalid ROM size\n"); + } +} + + +READ8_MEMBER(msx_cart_dooly::read_cart) +{ + if (offset >= 0x4000 && offset < 0xc000) + { + UINT8 data = get_rom_base()[offset - 0x4000]; + + switch (m_prot) + { + case 0x04: + data = BITSWAP8(data, 7, 6, 5, 4, 3, 1, 0, 2); + break; + } + return data; + } + return 0xff; +} + + +WRITE8_MEMBER(msx_cart_dooly::write_cart) +{ + if (offset >= 0x4000 && offset < 0xc000) + { + m_prot = data & 0x07; + if (m_prot != 0 && m_prot != 4) + { + logerror("msx_cart_dooly: unhandled write %02x to %04x\n", data, offset); + } + } +} |