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-rw-r--r--src/mame/machine/dc305.cpp101
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diff --git a/src/mame/machine/dc305.cpp b/src/mame/machine/dc305.cpp
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+ DEC DC305 Printer Controller
+
+ This device normally operates at 2 MHz with one wait state. It
+ generates two vectored interrupts.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "dc305.h"
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+// device type definition
+DEFINE_DEVICE_TYPE(DC305, dc305_device, "dc305", "DC305 Printer Controller")
+
+
+//**************************************************************************
+// DEVICE IMPLEMENTATION
+//**************************************************************************
+
+//-------------------------------------------------
+// dc305_device - constructor
+//-------------------------------------------------
+
+dc305_device::dc305_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, DC305, tag, owner, clock)
+ , m_int_callback(*this)
+ , m_rxc_callback(*this)
+ , m_txc_callback(*this)
+{
+}
+
+
+//-------------------------------------------------
+// device_resolve_objects - resolve objects that
+// may be needed for other devices to set
+// initial conditions at start time
+//-------------------------------------------------
+
+void dc305_device::device_resolve_objects()
+{
+ m_int_callback.resolve_safe();
+ m_rxc_callback.resolve_safe();
+ m_txc_callback.resolve_safe();
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void dc305_device::device_start()
+{
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void dc305_device::device_reset()
+{
+}
+
+
+//-------------------------------------------------
+// read - read from internal register
+//-------------------------------------------------
+
+u8 dc305_device::read(offs_t offset)
+{
+ // TODO
+ return 0;
+}
+
+
+//-------------------------------------------------
+// write - write to internal register
+//-------------------------------------------------
+
+void dc305_device::write(offs_t offset, u8 data)
+{
+ // TODO
+}
+
+
+//-------------------------------------------------
+// inta - acknowledge and vector interrupt
+//-------------------------------------------------
+
+u8 dc305_device::inta()
+{
+ // TODO: generate RST 5, RST 3 or RST 1 if both requested
+ return 0xff;
+}