diff options
Diffstat (limited to 'src/devices/bus/c64/ocean.cpp')
-rw-r--r-- | src/devices/bus/c64/ocean.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/devices/bus/c64/ocean.cpp b/src/devices/bus/c64/ocean.cpp new file mode 100644 index 00000000000..496651a1b25 --- /dev/null +++ b/src/devices/bus/c64/ocean.cpp @@ -0,0 +1,115 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Ocean Software cartridge emulation + +**********************************************************************/ + +/* + + Chase H.Q. 2: Special Criminal Investigation + + PCB Layout + ---------- + + |===========================| + |=| LS02 | + |=| | + |=| | + |=| ROM0 ROM1 | + |=| LS273 | + |=| | + |=| | + |=| | + |===========================| + + ROM0,1 - 28-pin ROM (Toshiba TC531000 pinout, markings scratched off) + +*/ + +#include "ocean.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_OCEAN = &device_creator<c64_ocean_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_ocean_cartridge_device - constructor +//------------------------------------------------- + +c64_ocean_cartridge_device::c64_ocean_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_OCEAN, "C64 Ocean cartridge", tag, owner, clock, "c64_ocean", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_bank(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_ocean_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_ocean_cartridge_device::device_reset() +{ + m_bank = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_ocean_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) +{ + if (!roml && m_roml.bytes()) + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_roml[addr & m_roml.mask()]; + } + else if (!romh && m_romh.bytes()) + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_romh[addr & m_romh.mask()]; + } + else if (!io1) + { + return m_bank; + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_ocean_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2) +{ + if (!io1) + { + m_bank = data & 0x3f; + } +} |