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Diffstat (limited to 'src/mess/machine/vic1110.c')
-rw-r--r-- | src/mess/machine/vic1110.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/mess/machine/vic1110.c b/src/mess/machine/vic1110.c new file mode 100644 index 00000000000..f164585528e --- /dev/null +++ b/src/mess/machine/vic1110.c @@ -0,0 +1,117 @@ +/********************************************************************** + + Commodore VIC-1110 8K RAM Expansion Cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "vic1110.h" + + +//************************************************************************** +// MACROS / CONSTANTS +//************************************************************************** + +enum +{ + BLK1 = 0x07, + BLK2 = 0x0b, + BLK3 = 0x0d, + BLK5 = 0x0e +}; + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type VIC1110 = &device_creator<vic1110_device>; + + + +//------------------------------------------------- +// INPUT_PORTS( vic1110 ) +//------------------------------------------------- + +INPUT_PORTS_START( vic1110 ) + PORT_START("SW") + PORT_DIPNAME( 0x0f, BLK1, "Memory Location" ) PORT_DIPLOCATION("SW:1,2,3,4") + PORT_DIPSETTING( BLK1, "$2000-$3FFF" ) + PORT_DIPSETTING( BLK2, "$4000-$5FFF" ) + PORT_DIPSETTING( BLK3, "$6000-$7FFF" ) + PORT_DIPSETTING( BLK5, "$A000-B3FFF" ) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor vic1110_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( vic1110 ); +} + + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// vic1110_device - constructor +//------------------------------------------------- + +vic1110_device::vic1110_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, VIC1110, "VIC1110", tag, owner, clock), + device_vic20_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void vic1110_device::device_start() +{ + // allocate memory + m_ram = auto_alloc_array(machine(), UINT8, 0x2000); +} + + +//------------------------------------------------- +// vic20_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 vic1110_device::vic20_cd_r(address_space &space, offs_t offset, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) +{ + UINT8 data = 0; + UINT8 sw = ioport("SW")->read(); + + if ((!blk1 && (sw == BLK1)) || (!blk2 && (sw == BLK2)) || (!blk3 && (sw == BLK3)) || (!blk5 && (sw == BLK5))) + { + data = m_ram[offset & 0x1fff]; + } + + return data; +} + + +//------------------------------------------------- +// vic20_cd_w - cartridge data write +//------------------------------------------------- + +void vic1110_device::vic20_cd_w(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) +{ + UINT8 sw = ioport("SW")->read(); + + if ((!blk1 && (sw == BLK1)) || (!blk2 && (sw == BLK2)) || (!blk3 && (sw == BLK3)) || (!blk5 && (sw == BLK5))) + { + m_ram[offset & 0x1fff] = data; + } +} |