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diff --git a/src/devices/bus/interpro/keyboard/hle.h b/src/devices/bus/interpro/keyboard/hle.h
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+// license:BSD-3-Clause
+// copyright-holders:Patrick Mackinlay
+#ifndef MAME_DEVICES_INTERPRO_KEYBOARD_HLE_H
+#define MAME_DEVICES_INTERPRO_KEYBOARD_HLE_H
+
+#pragma once
+
+#include "keyboard.h"
+#include "machine/keyboard.h"
+#include "sound/beep.h"
+
+namespace bus { namespace interpro { namespace keyboard {
+
+class hle_device_base
+ : public device_t
+ , public device_buffered_serial_interface<16U>
+ , public device_interpro_keyboard_port_interface
+ , protected device_matrix_keyboard_interface<5U>
+{
+public:
+ virtual ~hle_device_base() override;
+
+ virtual DECLARE_WRITE_LINE_MEMBER(input_txd) override;
+
+protected:
+ // constructor/destructor
+ hle_device_base(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock);
+
+ // device overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+ // device_buffered_serial_interface overrides
+ virtual void tra_callback() override;
+ virtual void tra_complete() override;
+
+ // device_matrix_keyboard_interface overrides
+ virtual void key_make(u8 row, u8 column) override;
+ virtual void key_break(u8 row, u8 column) override;
+
+ // customised transmit_byte method
+ void transmit_byte(u8 byte);
+ virtual u8 translate(u8 row, u8 column) = 0;
+
+private:
+ enum {
+ CLICK_TIMER_ID = 30'000
+ };
+
+ enum : int {
+ LED_DISK = 0,
+ LED_LOCK,
+ LED_UNKNOWN,
+ LED_L1,
+ LED_L2,
+ LED_L3,
+ LED_L4
+ };
+
+ enum : u8 {
+ BEEPER_BELL = 0x01U,
+ BEEPER_CLICK = 0x02U
+ };
+
+ enum : u8 {
+ RX_IDLE,
+ RX_ESC,
+ RX_BELL
+ };
+
+ enum : u8 {
+ COMMAND_RESET = 0x01U,
+ COMMAND_BELL_ON = 0x02U,
+ COMMAND_BELL_OFF = 0x03U,
+ COMMAND_CLICK_ON = 0x0aU,
+ COMMAND_CLICK_OFF = 0x0bU,
+ COMMAND_LED = 0x0eU,
+ COMMAND_LAYOUT = 0x0fU
+ };
+
+ // device_buffered_serial_interface overrides
+ virtual void received_byte(u8 byte) override;
+
+ emu_timer *m_click_timer;
+ required_device<beep_device> m_beeper;
+
+ u8 m_make_count;
+ u8 m_rx_state;
+
+ u8 m_keyclick;
+ u8 m_beeper_state;
+};
+
+
+class hle_en_us_device : public hle_device_base
+{
+public:
+ hle_en_us_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
+
+ virtual ioport_constructor device_input_ports() const override;
+
+ virtual u8 translate(u8 row, u8 column) override;
+
+ required_ioport m_modifiers;
+};
+
+} } } // namespace bus::interpro::keyboard
+
+DECLARE_DEVICE_TYPE_NS(INTERPRO_HLE_EN_US_KEYBOARD, bus::interpro::keyboard, hle_en_us_device)
+
+#endif // MAME_DEVICES_INTERPRO_KEYBOARD_HLE_H