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-rw-r--r--src/emu/bus/vic20/vic1111.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/emu/bus/vic20/vic1111.c b/src/emu/bus/vic20/vic1111.c
new file mode 100644
index 00000000000..29e4ff6f16c
--- /dev/null
+++ b/src/emu/bus/vic20/vic1111.c
@@ -0,0 +1,83 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Commodore VIC-1111 16K RAM Expansion Cartridge emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#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)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void vic1111_device::device_start()
+{
+ // allocate memory
+ m_ram = auto_alloc_array(machine(), UINT8, 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;
+ }
+}