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-rw-r--r--src/devices/bus/vidbrain/timeshare.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/devices/bus/vidbrain/timeshare.c b/src/devices/bus/vidbrain/timeshare.c
new file mode 100644
index 00000000000..196bf66db2e
--- /dev/null
+++ b/src/devices/bus/vidbrain/timeshare.c
@@ -0,0 +1,75 @@
+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ VideoBrain Timeshare cartridge emulation
+
+**********************************************************************/
+
+#include "timeshare.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type VB_TIMESHARE = &device_creator<videobrain_timeshare_cartridge_device>;
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// videobrain_timeshare_cartridge_device - constructor
+//-------------------------------------------------
+
+videobrain_timeshare_cartridge_device::videobrain_timeshare_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, VB_TIMESHARE, "VideoBrain Timeshare cartridge", tag, owner, clock, "vb_timeshare", __FILE__),
+ device_videobrain_expansion_card_interface(mconfig, *this)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void videobrain_timeshare_cartridge_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// videobrain_bo_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 videobrain_timeshare_cartridge_device::videobrain_bo_r(address_space &space, offs_t offset, int cs1, int cs2)
+{
+ UINT8 data = 0;
+
+ if (!cs1)
+ {
+ data = m_rom[offset & m_rom_mask];
+ }
+ else if (!cs2)
+ {
+ data = m_ram[offset & m_ram_mask];
+ }
+ return data;
+}
+
+
+//-------------------------------------------------
+// videobrain_bo_w - cartridge data write
+//-------------------------------------------------
+
+void videobrain_timeshare_cartridge_device::videobrain_bo_w(address_space &space, offs_t offset, UINT8 data, int cs1, int cs2)
+{
+ if (!cs2)
+ {
+ m_ram[offset & m_ram_mask] = data;
+ }
+}