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diff --git a/src/mame/machine/hp80_optrom.h b/src/mame/machine/hp80_optrom.h
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+// license:BSD-3-Clause
+// copyright-holders: F. Ulivi
+/*********************************************************************
+
+ hp80_optrom.h
+
+ Optional ROMs for HP80 systems
+
+*********************************************************************/
+
+#ifndef MAME_MACHINE_HP80_OPTROM_H
+#define MAME_MACHINE_HP80_OPTROM_H
+
+#pragma once
+
+#include "softlist_dev.h"
+
+// Size of optional ROMs (8k)
+static constexpr offs_t HP80_OPTROM_SIZE = 0x2000;
+
+class hp80_optrom_device : public device_t,
+ public device_image_interface
+{
+public:
+ // construction/destruction
+ hp80_optrom_device(machine_config const &mconfig, char const *tag, device_t *owner)
+ : hp80_optrom_device(mconfig, tag, owner, (uint32_t)0)
+ {
+ }
+
+ hp80_optrom_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+ virtual ~hp80_optrom_device();
+
+ void install_read_handler(address_space& space);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override;
+
+ // image-level overrides
+ virtual image_init_result call_load() override;
+ virtual void call_unload() override;
+ virtual const software_list_loader &get_software_list_loader() const override { return rom_software_list_loader::instance(); }
+
+ virtual iodevice_t image_type() const override { return IO_ROM; }
+ virtual bool is_readable() const override { return true; }
+ virtual bool is_writeable() const override { return false; }
+ virtual bool is_creatable() const override { return false; }
+ virtual bool must_be_loaded() const override { return false; }
+ virtual bool is_reset_on_load() const override { return true; }
+ virtual const char *image_interface() const override { return "hp80_rom"; }
+ virtual const char *file_extensions() const override { return "bin"; }
+
+ uint8_t m_select_code;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(HP80_OPTROM, hp80_optrom_device)
+
+#endif // MAME_MACHINE_HP80_OPTROM_H