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diff --git a/src/mame/includes/cxgbase.h b/src/mame/includes/cxgbase.h
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/******************************************************************************
+*
+* CXG chess computer driver base class
+*
+******************************************************************************/
+
+#pragma once
+
+#ifndef MAME_INCLUDES_CXGBASE_H
+#define MAME_INCLUDES_CXGBASE_H
+
+#include "machine/timer.h"
+#include "sound/dac.h"
+
+class cxgbase_state : public driver_device
+{
+public:
+ cxgbase_state(const machine_config &mconfig, device_type type, const char *tag) :
+ driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_irq_on(*this, "irq_on"),
+ m_dac(*this, "dac"),
+ m_inp_matrix(*this, "IN.%u", 0),
+ m_out_x(*this, "%u.%u", 0U, 0U),
+ m_out_a(*this, "%u.a", 0U),
+ m_out_digit(*this, "digit%u", 0U),
+ m_display_wait(33),
+ m_display_maxy(1),
+ m_display_maxx(0)
+ { }
+
+ // devices/pointers
+ required_device<cpu_device> m_maincpu;
+ optional_device<timer_device> m_irq_on;
+ optional_device<dac_bit_interface> m_dac;
+ optional_ioport_array<10> m_inp_matrix; // max 10
+ output_finder<0x20, 0x20> m_out_x;
+ output_finder<0x20> m_out_a;
+ output_finder<0x20> m_out_digit;
+
+ template<int L> TIMER_DEVICE_CALLBACK_MEMBER(irq_on) { m_maincpu->set_input_line(L, ASSERT_LINE); }
+ template<int L> TIMER_DEVICE_CALLBACK_MEMBER(irq_off) { m_maincpu->set_input_line(L, CLEAR_LINE); }
+
+ // misc common
+ u16 m_inp_mux; // multiplexed keypad mask
+ u16 m_led_select;
+ u16 m_led_data;
+
+ u16 read_inputs(int columns);
+
+ // display common
+ int m_display_wait; // led/lamp off-delay in milliseconds (default 33ms)
+ int m_display_maxy; // display matrix number of rows
+ int m_display_maxx; // display matrix number of columns (max 31 for now)
+
+ u32 m_display_state[0x20]; // display matrix rows data (last bit is used for always-on)
+ u16 m_display_segmask[0x20]; // if not 0, display matrix row is a digit, mask indicates connected segments
+ u8 m_display_decay[0x20][0x20]; // (internal use)
+
+ TIMER_DEVICE_CALLBACK_MEMBER(display_decay_tick);
+ void display_update();
+ void set_display_size(int maxx, int maxy);
+ void display_matrix(int maxx, int maxy, u32 setx, u32 sety, bool update = true);
+
+protected:
+ virtual void machine_start() override;
+ virtual void machine_reset() override;
+};
+
+
+INPUT_PORTS_EXTERN( cxg_cb_magnets );
+
+#endif // MAME_INCLUDES_CXGBASE_H