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diff --git a/src/devices/bus/odyssey2/test.h b/src/devices/bus/odyssey2/test.h
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/**********************************************************************
+
+ Videopac Service Test cartridge emulation
+
+**********************************************************************/
+
+#ifndef MAME_BUS_ODYSSEY2_TEST_H
+#define MAME_BUS_ODYSSEY2_TEST_H
+
+#pragma once
+
+#include "slot.h"
+
+
+// ======================> o2_test_device
+
+class o2_test_device : public device_t,
+ public device_o2_cart_interface
+{
+public:
+ // construction/destruction
+ o2_test_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ virtual void cart_init() override;
+
+ virtual u8 read_rom04(offs_t offset) override { return m_rom[offset]; }
+ virtual u8 read_rom0c(offs_t offset) override { return m_rom[offset]; }
+ virtual void bus_write(u8 data) override { m_bus_data = data; }
+
+ virtual void write_p1(u8 data) override;
+
+private:
+ output_finder<> m_digit_out;
+
+ u8 m_control = 0;
+ u8 m_bus_data = 0;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(O2_ROM_TEST, o2_test_device)
+
+#endif // MAME_BUS_ODYSSEY2_TEST_H