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diff --git a/src/devices/bus/a800/oss.h b/src/devices/bus/a800/oss.h
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+#ifndef __A800_OSS_H
+#define __A800_OSS_H
+
+#include "rom.h"
+
+
+// ======================> a800_rom_oss8k_device
+
+class a800_rom_oss8k_device : public a800_rom_device
+{
+public:
+ // construction/destruction
+ a800_rom_oss8k_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 DECLARE_READ8_MEMBER(read_80xx);
+ virtual DECLARE_WRITE8_MEMBER(write_d5xx);
+
+protected:
+ int m_bank;
+};
+
+
+// ======================> a800_rom_oss34_device
+
+class a800_rom_oss34_device : public a800_rom_device
+{
+public:
+ // construction/destruction
+ a800_rom_oss34_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 DECLARE_READ8_MEMBER(read_80xx);
+ virtual DECLARE_WRITE8_MEMBER(write_d5xx);
+
+protected:
+ int m_bank;
+};
+
+
+// ======================> a800_rom_oss43_device
+
+class a800_rom_oss43_device : public a800_rom_device
+{
+public:
+ // construction/destruction
+ a800_rom_oss43_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 DECLARE_READ8_MEMBER(read_80xx);
+ virtual DECLARE_WRITE8_MEMBER(write_d5xx);
+
+protected:
+ int m_bank;
+};
+
+
+// ======================> a800_rom_oss91_device
+
+class a800_rom_oss91_device : public a800_rom_device
+{
+public:
+ // construction/destruction
+ a800_rom_oss91_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 DECLARE_READ8_MEMBER(read_80xx);
+ virtual DECLARE_WRITE8_MEMBER(write_d5xx);
+
+protected:
+ int m_bank;
+};
+
+
+
+// device type definition
+extern const device_type A800_ROM_OSS8K;
+extern const device_type A800_ROM_OSS34;
+extern const device_type A800_ROM_OSS43;
+extern const device_type A800_ROM_OSS91;
+
+
+#endif