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-rw-r--r--src/devices/bus/pc8801/pc8801_31.h66
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diff --git a/src/devices/bus/pc8801/pc8801_31.h b/src/devices/bus/pc8801/pc8801_31.h
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+++ b/src/devices/bus/pc8801/pc8801_31.h
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+// license:BSD-3-Clause
+// copyright-holders:Angelo Salese
+/**************************************************************************************************
+
+ NEC PC8801-31 CD-ROM I/F
+
+**************************************************************************************************/
+
+#ifndef MAME_BUS_PC8801_31_H
+#define MAME_BUS_PC8801_31_H
+
+#pragma once
+
+#include "machine/nscsi_bus.h"
+#include "bus/nscsi/cd.h"
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class pc8801_31_device : public device_t
+{
+public:
+ // construction/destruction
+ pc8801_31_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+ auto rom_bank_cb() { return m_rom_bank_cb.bind(); }
+
+ // I/O operations
+ void amap(address_map &map);
+
+protected:
+ // device_t implementation
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+ TIMER_CALLBACK_MEMBER(select_off);
+
+private:
+ required_device<nscsi_bus_device> m_scsibus;
+
+ devcb_write_line m_rom_bank_cb;
+
+ emu_timer *m_sel_off_timer;
+
+ u8 scsi_status_r();
+ void scsi_sel_w(u8 data);
+ void scsi_reset_w(u8 data);
+ u8 clock_r();
+ void volume_control_w(u8 data);
+ u8 id_r();
+ void rom_bank_w(u8 data);
+ u8 volume_meter_r();
+
+ bool m_clock_hb;
+ bool m_cddrive_enable;
+};
+
+
+// device type definition
+DECLARE_DEVICE_TYPE(PC8801_31, pc8801_31_device)
+
+#endif // MAME_BUS_PC8801_31_H