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Diffstat (limited to 'src/devices/bus/c64/16kb.c')
-rw-r--r-- | src/devices/bus/c64/16kb.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/devices/bus/c64/16kb.c b/src/devices/bus/c64/16kb.c new file mode 100644 index 00000000000..ff2ce6e3932 --- /dev/null +++ b/src/devices/bus/c64/16kb.c @@ -0,0 +1,124 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore 64 16KB EPROM cartridge emulation + +**********************************************************************/ + +#include "16kb.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_16KB = &device_creator<c64_16kb_cartridge_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_16kb ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_16kb ) + MCFG_GENERIC_CARTSLOT_ADD("roml", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("rom,bin,80") + + MCFG_GENERIC_CARTSLOT_ADD("romh", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("rom,bin,a0,e0") +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_16kb_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_16kb ); +} + + +//------------------------------------------------- +// INPUT_PORTS( c64_16kb ) +//------------------------------------------------- + +static INPUT_PORTS_START( c64_16kb ) + PORT_START("SW1") + PORT_DIPNAME( 0x03, 0x00, "Mode" ) + PORT_DIPSETTING( 0x03, "Off" ) + PORT_DIPSETTING( 0x02, "8 KB" ) + PORT_DIPSETTING( 0x00, "16 KB" ) + PORT_DIPSETTING( 0x01, "Ultimax" ) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor c64_16kb_cartridge_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( c64_16kb ); +} + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_16kb_cartridge_device - constructor +//------------------------------------------------- + +c64_16kb_cartridge_device::c64_16kb_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_16KB, "C64 16KB EPROM cartridge", tag, owner, clock, "c64_16kb", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_sw1(*this, "SW1"), + m_low(*this, "roml"), + m_high(*this, "romh") +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_16kb_cartridge_device::device_start() +{ +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_16kb_cartridge_device::device_reset() +{ + UINT8 mode = m_sw1->read(); + + m_exrom = BIT(mode, 0); + m_game = BIT(mode, 1); +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_16kb_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_low->read_rom(space, offset & 0x1fff); + } + else if (!romh) + { + data = m_high->read_rom(space, offset & 0x1fff); + } + + return data; +} |