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diff --git a/src/devices/bus/odyssey2/voice.h b/src/devices/bus/odyssey2/voice.h
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+#ifndef __O2_VOICE_H
+#define __O2_VOICE_H
+
+#include "slot.h"
+#include "rom.h"
+#include "sound/sp0256.h"
+
+
+// ======================> o2_voice_device
+
+class o2_voice_device : public o2_rom_device
+{
+public:
+ // construction/destruction
+ o2_voice_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset() {}
+
+ virtual machine_config_constructor device_mconfig_additions() const;
+ virtual const rom_entry *device_rom_region() const;
+
+ // reading and writing
+ virtual DECLARE_READ8_MEMBER(read_rom04) { if (m_subslot->exists()) return m_subslot->read_rom04(space, offset); else return 0xff; }
+ virtual DECLARE_READ8_MEMBER(read_rom0c) { if (m_subslot->exists()) return m_subslot->read_rom0c(space, offset); else return 0xff; }
+
+ virtual void write_bank(int bank) { if (m_subslot->exists()) m_subslot->write_bank(bank); }
+
+ DECLARE_WRITE_LINE_MEMBER(lrq_callback);
+ DECLARE_WRITE8_MEMBER(io_write);
+ DECLARE_READ8_MEMBER(t0_read) { return m_speech->lrq_r() ? 0 : 1; }
+
+private:
+ required_device<sp0256_device> m_speech;
+ required_device<o2_cart_slot_device> m_subslot;
+
+ int m_lrq_state;
+};
+
+
+
+
+// device type definition
+extern const device_type O2_ROM_VOICE;
+
+
+#endif