diff options
Diffstat (limited to 'src/devices/bus/vic20/std.c')
-rw-r--r-- | src/devices/bus/vic20/std.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/std.c b/src/devices/bus/vic20/std.c new file mode 100644 index 00000000000..4757470b093 --- /dev/null +++ b/src/devices/bus/vic20/std.c @@ -0,0 +1,69 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore VIC-20 Standard 8K/16K ROM Cartridge emulation + +**********************************************************************/ + +#include "std.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type VIC20_STD = &device_creator<vic20_standard_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// vic20_standard_cartridge_device - constructor +//------------------------------------------------- + +vic20_standard_cartridge_device::vic20_standard_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, VIC20_STD, "VIC-20 Standard Cartridge", tag, owner, clock, "vic20_standard", __FILE__), + device_vic20_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void vic20_standard_cartridge_device::device_start() +{ +} + + +//------------------------------------------------- +// vic20_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 vic20_standard_cartridge_device::vic20_cd_r(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) +{ + if (!blk1 && (m_blk1 != NULL)) + { + data = m_blk1[offset]; + } + else if (!blk2 && (m_blk2 != NULL)) + { + data = m_blk2[offset]; + } + else if (!blk3 && (m_blk3 != NULL)) + { + data = m_blk3[offset]; + } + else if (!blk5 && (m_blk5 != NULL)) + { + data = m_blk5[offset]; + } + + return data; +} |