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diff --git a/src/mame/drivers/ckingbase.cpp b/src/mame/drivers/ckingbase.cpp
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+++ b/src/mame/drivers/ckingbase.cpp
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/******************************************************************************
+
+ Chess King chess computer driver base class
+
+ NOTE: MAME doesn't include a generalized implementation for boardpieces yet,
+ greatly affecting user playability of emulated electronic board games.
+ As workaround for the chess games, use an external chess GUI on the side,
+ such as Arena(in editmode).
+
+******************************************************************************/
+
+#include "emu.h"
+#include "includes/ckingbase.h"
+
+
+// machine start/reset
+
+void ckingbase_state::machine_start()
+{
+ // resolve handlers
+ m_out_x.resolve();
+ m_out_a.resolve();
+ m_out_digit.resolve();
+
+ // zerofill
+ memset(m_display_state, 0, sizeof(m_display_state));
+ memset(m_display_decay, 0, sizeof(m_display_decay));
+ memset(m_display_segmask, 0, sizeof(m_display_segmask));
+
+ m_inp_mux = 0;
+ m_led_select = 0;
+ m_led_data = 0;
+
+ // register for savestates
+ save_item(NAME(m_display_maxy));
+ save_item(NAME(m_display_maxx));
+ save_item(NAME(m_display_wait));
+
+ save_item(NAME(m_display_state));
+ save_item(NAME(m_display_decay));
+ save_item(NAME(m_display_segmask));
+
+ save_item(NAME(m_inp_mux));
+ save_item(NAME(m_led_select));
+ save_item(NAME(m_led_data));
+}
+
+void ckingbase_state::machine_reset()
+{
+}
+
+
+
+/***************************************************************************
+
+ Helper Functions
+
+***************************************************************************/
+
+// The device may strobe the outputs very fast, it is unnoticeable to the user.
+// To prevent flickering here, we need to simulate a decay.
+
+void ckingbase_state::display_update()
+{
+ for (int y = 0; y < m_display_maxy; y++)
+ {
+ u32 active_state = 0;
+
+ for (int x = 0; x <= m_display_maxx; x++)
+ {
+ // turn on powered segments
+ if (m_display_state[y] >> x & 1)
+ m_display_decay[y][x] = m_display_wait;
+
+ // determine active state
+ u32 ds = (m_display_decay[y][x] != 0) ? 1 : 0;
+ active_state |= (ds << x);
+
+ // output to y.x, or y.a when always-on
+ if (x != m_display_maxx)
+ m_out_x[y][x] = ds;
+ else
+ m_out_a[y] = ds;
+ }
+
+ // output to digity
+ if (m_display_segmask[y] != 0)
+ m_out_digit[y] = active_state & m_display_segmask[y];
+ }
+}
+
+TIMER_DEVICE_CALLBACK_MEMBER(ckingbase_state::display_decay_tick)
+{
+ // slowly turn off unpowered segments
+ for (int y = 0; y < m_display_maxy; y++)
+ for (int x = 0; x <= m_display_maxx; x++)
+ if (m_display_decay[y][x] != 0)
+ m_display_decay[y][x]--;
+
+ display_update();
+}
+
+void ckingbase_state::set_display_size(int maxx, int maxy)
+{
+ m_display_maxx = maxx;
+ m_display_maxy = maxy;
+}
+
+void ckingbase_state::display_matrix(int maxx, int maxy, u32 setx, u32 sety, bool update)
+{
+ set_display_size(maxx, maxy);
+
+ // update current state
+ u32 mask = (1 << maxx) - 1;
+ for (int y = 0; y < maxy; y++)
+ m_display_state[y] = (sety >> y & 1) ? ((setx & mask) | (1 << maxx)) : 0;
+
+ if (update)
+ display_update();
+}
+
+
+// generic input handlers
+
+u16 ckingbase_state::read_inputs(int columns)
+{
+ u16 ret = 0;
+
+ // read selected input rows
+ for (int i = 0; i < columns; i++)
+ if (m_inp_mux >> i & 1)
+ ret |= m_inp_matrix[i]->read();
+
+ return ret;
+}
+
+
+// chessboard generic inputs
+
+INPUT_PORTS_START( cking_cb_buttons )
+ PORT_START("IN.0")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.1")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.2")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.3")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.4")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.5")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.6")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+
+ PORT_START("IN.7")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("Board Sensor")
+INPUT_PORTS_END