diff options
Diffstat (limited to 'src/mess/machine/c64/zaxxon.c')
-rw-r--r-- | src/mess/machine/c64/zaxxon.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/mess/machine/c64/zaxxon.c b/src/mess/machine/c64/zaxxon.c new file mode 100644 index 00000000000..247870988af --- /dev/null +++ b/src/mess/machine/c64/zaxxon.c @@ -0,0 +1,67 @@ +/********************************************************************** + + Zaxxon/Super Zaxxon cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "zaxxon.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_ZAXXON = &device_creator<c64_zaxxon_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_zaxxon_cartridge_device - constructor +//------------------------------------------------- + +c64_zaxxon_cartridge_device::c64_zaxxon_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_ZAXXON, "C64 Zaxxon cartridge", tag, owner, clock, "c64_zaxxon", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_zaxxon_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_zaxxon_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) + { + data = m_roml[offset & 0xfff]; + + m_bank = BIT(offset, 12); + } + else if (!romh) + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_romh[addr]; + } + + return data; +} |