diff options
Diffstat (limited to 'src/devices/bus/coleco/xin1.c')
-rw-r--r-- | src/devices/bus/coleco/xin1.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/devices/bus/coleco/xin1.c b/src/devices/bus/coleco/xin1.c new file mode 100644 index 00000000000..e46b65eeadd --- /dev/null +++ b/src/devices/bus/coleco/xin1.c @@ -0,0 +1,71 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +/********************************************************************** + + ColecoVision X-in-1 cartridge emulation + +**********************************************************************/ + +#include "xin1.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type COLECOVISION_XIN1 = &device_creator<colecovision_xin1_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// colecovision_xin1_cartridge_device - constructor +//------------------------------------------------- + +colecovision_xin1_cartridge_device::colecovision_xin1_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, COLECOVISION_XIN1, "ColecoVision X-in-1 cartridge", tag, owner, clock, "colecovision_xin1", __FILE__), + device_colecovision_cartridge_interface(mconfig, *this), + m_current_offset(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void colecovision_xin1_cartridge_device::device_start() +{ +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void colecovision_xin1_cartridge_device::device_reset() +{ + m_current_offset = m_rom_size - 0x8000; +} + + +//------------------------------------------------- +// read - cartridge data read +//------------------------------------------------- + +UINT8 colecovision_xin1_cartridge_device::bd_r(address_space &space, offs_t offset, UINT8 data, int _8000, int _a000, int _c000, int _e000) +{ + if (!_8000 || !_a000 || !_c000 || !_e000) + { + data = m_rom[m_current_offset + offset]; + if (!_e000 && offset >= 0x7fc0) { + m_current_offset = (0x8000 * (offset - 0x7fc0)) % m_rom_size; + } + } + + return data; +} |