diff options
author | 2012-08-21 10:41:19 +0000 | |
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committer | 2012-08-21 10:41:19 +0000 | |
commit | 7285b359d259b2ae0fdf85096571c386ec8c991a (patch) | |
tree | a027aff57f1a255f9ec6cfd3b68cabe4b6683998 /src/mess/machine/c64_ocean.c | |
parent | 67c425e90757876a6716b7867df30c0149912e74 (diff) |
Merge of MESS sources (no whatsnew)
Diffstat (limited to 'src/mess/machine/c64_ocean.c')
-rw-r--r-- | src/mess/machine/c64_ocean.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mess/machine/c64_ocean.c b/src/mess/machine/c64_ocean.c new file mode 100644 index 00000000000..ffe7ddd8471 --- /dev/null +++ b/src/mess/machine/c64_ocean.c @@ -0,0 +1,117 @@ +/********************************************************************** + + Ocean Software cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +/* + + 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 "c64_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), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// 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, int ba, int roml, int romh, int io1, int io2) +{ + UINT8 data = 0; + + if (!roml) + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_roml[addr & m_roml_mask]; + } + else if (!romh) + { + 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 ba, int roml, int romh, int io1, int io2) +{ + if (!io1) + { + m_bank = data & 0x3f; + } +} |