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Diffstat (limited to 'src/mess/machine/c64/prophet64.c')
-rw-r--r-- | src/mess/machine/c64/prophet64.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/mess/machine/c64/prophet64.c b/src/mess/machine/c64/prophet64.c new file mode 100644 index 00000000000..fab038f6f46 --- /dev/null +++ b/src/mess/machine/c64/prophet64.c @@ -0,0 +1,87 @@ +/********************************************************************** + + PROPHET64 cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "prophet64.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_PROPHET64 = &device_creator<c64_prophet64_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_prophet64_cartridge_device - constructor +//------------------------------------------------- + +c64_prophet64_cartridge_device::c64_prophet64_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_PROPHET64, "PROPHET64", tag, owner, clock, "c64_prophet64", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_bank(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_prophet64_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_prophet64_cartridge_device::device_reset() +{ + m_bank = 0; + m_exrom = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_prophet64_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) + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_roml[addr]; + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_prophet64_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 (!io2) + { + m_bank = data & 0x1f; + m_exrom = BIT(data, 5); + } +} |