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diff --git a/src/devices/bus/nes/discrete.h b/src/devices/bus/nes/discrete.h
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+#ifndef __NES_DISCRETE_H
+#define __NES_DISCRETE_H
+
+#include "nxrom.h"
+
+
+// ======================> nes_74x161x161x32_device
+
+class nes_74x161x161x32_device : public nes_nrom_device
+{
+public:
+ // construction/destruction
+ nes_74x161x161x32_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual DECLARE_WRITE8_MEMBER(write_h);
+
+ virtual void pcb_reset();
+};
+
+
+// ======================> nes_74x139x74_device
+
+class nes_74x139x74_device : public nes_nrom_device
+{
+public:
+ // construction/destruction
+ nes_74x139x74_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual DECLARE_WRITE8_MEMBER(write_m);
+
+ virtual void pcb_reset();
+};
+
+
+// ======================> nes_74x377_device
+
+class nes_74x377_device : public nes_nrom_device
+{
+public:
+ // construction/destruction
+ nes_74x377_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual DECLARE_WRITE8_MEMBER(write_h);
+
+ virtual void pcb_reset();
+};
+
+
+// ======================> nes_74x161x138_device
+
+class nes_74x161x138_device : public nes_nrom_device
+{
+public:
+ // construction/destruction
+ nes_74x161x138_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ // device-level overrides
+ virtual void device_start();
+ virtual DECLARE_WRITE8_MEMBER(write_m);
+
+ virtual void pcb_reset();
+};
+
+
+
+// device type definition
+extern const device_type NES_74X161X161X32;
+extern const device_type NES_74X139X74;
+extern const device_type NES_74X377;
+extern const device_type NES_74X161X138;
+
+#endif