diff options
Diffstat (limited to 'src/devices/bus/vic20/vic1111.cpp')
-rw-r--r-- | src/devices/bus/vic20/vic1111.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/vic1111.cpp b/src/devices/bus/vic20/vic1111.cpp new file mode 100644 index 00000000000..770d5639d8f --- /dev/null +++ b/src/devices/bus/vic20/vic1111.cpp @@ -0,0 +1,81 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore VIC-1111 16K RAM Expansion Cartridge emulation + +**********************************************************************/ + +#include "vic1111.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type VIC1111 = &device_creator<vic1111_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// vic1111_device - constructor +//------------------------------------------------- + +vic1111_device::vic1111_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, VIC1111, "VIC1111", tag, owner, clock, "vic1111", __FILE__), + device_vic20_expansion_card_interface(mconfig, *this), + m_ram(*this, "ram") +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void vic1111_device::device_start() +{ + // allocate memory + m_ram.allocate(0x4000); +} + + +//------------------------------------------------- +// vic20_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 vic1111_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) + { + data = m_ram[offset]; + } + else if (!blk2) + { + data = m_ram[0x2000 + offset]; + } + + return data; +} + + +//------------------------------------------------- +// vic20_cd_w - cartridge data write +//------------------------------------------------- + +void vic1111_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) +{ + if (!blk1) + { + m_ram[offset] = data; + } + else if (!blk2) + { + m_ram[0x2000 + offset] = data; + } +} |