diff options
Diffstat (limited to 'src/devices/bus/odyssey2/4in1.cpp')
-rw-r--r-- | src/devices/bus/odyssey2/4in1.cpp | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/devices/bus/odyssey2/4in1.cpp b/src/devices/bus/odyssey2/4in1.cpp new file mode 100644 index 00000000000..e1c382e7fe9 --- /dev/null +++ b/src/devices/bus/odyssey2/4in1.cpp @@ -0,0 +1,53 @@ +// license:BSD-3-Clause +// copyright-holders:hap +/****************************************************************************** + +Videopac 40 cartridge emulation + +3KB program ROM + 1KB bankswitched data ROM + +Used in: +- #31: Musician +- #40: 4 in 1 Row + +******************************************************************************/ + +#include "emu.h" +#include "4in1.h" + + +//------------------------------------------------- +// o2_4in1_device - constructor +//------------------------------------------------- + +DEFINE_DEVICE_TYPE(O2_ROM_4IN1, o2_4in1_device, "o2_4in1", "Odyssey 2 Videopac 40") + + +o2_4in1_device::o2_4in1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : + o2_rom_device(mconfig, O2_ROM_4IN1, tag, owner, clock) +{ } + +void o2_4in1_device::device_start() +{ + save_item(NAME(m_control)); + save_item(NAME(m_bank)); +} + +void o2_4in1_device::cart_init() +{ + if (m_rom_size != 0x1000) + fatalerror("o2_4in1_device: Wrong ROM region size\n"); +} + + +//------------------------------------------------- +// mapper specific handlers +//------------------------------------------------- + +u8 o2_4in1_device::io_read(offs_t offset) +{ + if (m_control & 2) + return m_rom[m_bank << 8 | offset]; + else + return 0xff; +} |