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diff --git a/src/mame/machine/qimi.h b/src/mame/machine/qimi.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder, Phill Harvey-Smith
+/**********************************************************************
+
+ QJump/Quanta QL Internal Mouse Interface emulation
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __QIMI__
+#define __QIMI__
+
+#include "emu.h"
+
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_QIMI_EXTINT_CALLBACK(_write) \
+ devcb = &qimi_t::set_exting_wr_callback(*device, DEVCB_##_write);
+
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> qimi_t
+
+class qimi_t : public device_t
+{
+public:
+ // construction/destruction
+ qimi_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ template<class _Object> static devcb_base &set_exting_wr_callback(device_t &device, _Object object) { return downcast<qimi_t &>(device).m_write_extint.set_callback(object); }
+
+ // optional information overrides
+ virtual ioport_constructor device_input_ports() const;
+
+ UINT8 read(address_space &space, offs_t offset, UINT8 data);
+ DECLARE_WRITE8_MEMBER( write );
+
+ DECLARE_INPUT_CHANGED_MEMBER( mouse_x_changed );
+ DECLARE_INPUT_CHANGED_MEMBER( mouse_y_changed );
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+
+private:
+ enum
+ {
+ ST_Y_DIR = 0x01,
+ ST_X_INT = 0x04,
+ ST_X_DIR = 0x10,
+ ST_Y_INT = 0x20
+ };
+
+ devcb_write_line m_write_extint;
+
+ required_ioport m_buttons;
+
+ UINT8 m_status;
+ bool m_extint_en;
+};
+
+
+// device type definition
+extern const device_type QIMI;
+
+
+
+#endif