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-rw-r--r--src/devices/bus/tanbus/tanrtc.cpp86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/devices/bus/tanbus/tanrtc.cpp b/src/devices/bus/tanbus/tanrtc.cpp
new file mode 100644
index 00000000000..5583ac79c4d
--- /dev/null
+++ b/src/devices/bus/tanbus/tanrtc.cpp
@@ -0,0 +1,86 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Microtanic Real Time Clock
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "tanrtc.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(TANBUS_TANRTC, tanbus_tanrtc_device, "tanbus_tanrtc", "Microtanic Real Time Clock")
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void tanbus_tanrtc_device::device_add_mconfig(machine_config &config)
+{
+ MC146818(config, m_rtc, 32.768_kHz_XTAL);
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// tanbus_tanrtc_device - constructor
+//-------------------------------------------------
+
+tanbus_tanrtc_device::tanbus_tanrtc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, TANBUS_TANRTC, tag, owner, clock)
+ , device_tanbus_interface(mconfig, *this)
+ , m_rtc(*this, "rtc")
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void tanbus_tanrtc_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// read - card read
+//-------------------------------------------------
+
+uint8_t tanbus_tanrtc_device::read(offs_t offset, int inhrom, int inhram, int be)
+{
+ uint8_t data = 0xff;
+
+ switch (offset & 0xffc0)
+ {
+ case 0xbc00:
+ data = m_rtc->read_direct(offset);
+ break;
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// write - card write
+//-------------------------------------------------
+
+void tanbus_tanrtc_device::write(offs_t offset, uint8_t data, int inhrom, int inhram, int be)
+{
+ switch (offset & 0xffc0)
+ {
+ case 0xbc00:
+ m_rtc->write_direct(offset, data);
+ break;
+ }
+}