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+// license:BSD-3-Clause
+// copyright-holders:Sandro Ronco
+/**********************************************************************
+
+Hegener + Glaser Mephisto Display Module for modular chesscomputers,
+the 2nd version with 2 LCD lines. The 16/32bit module also includes 8KB NVRAM,
+but that part is emulated in the driver.
+
+TODO:
+- add mmdisplay1.cpp, the one with shift registers and 4-digit lcd
+
+*********************************************************************/
+
+#include "emu.h"
+
+#include "mmdisplay2.h"
+#include "sound/volt_reg.h"
+
+
+DEFINE_DEVICE_TYPE(MEPHISTO_DISPLAY_MODULE2, mephisto_display_module2_device, "mdisplay2", "Mephisto Display Module 2")
+
+//-------------------------------------------------
+// constructor
+//-------------------------------------------------
+
+mephisto_display_module2_device::mephisto_display_module2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, MEPHISTO_DISPLAY_MODULE2, tag, owner, clock)
+ , m_lcdc(*this, "hd44780")
+ , m_dac(*this, "dac")
+{
+}
+
+
+//-------------------------------------------------
+// device_add_mconfig
+//-------------------------------------------------
+
+void mephisto_display_module2_device::device_add_mconfig(machine_config &config)
+{
+ /* video hardware */
+ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_LCD));
+ screen.set_refresh_hz(50);
+ screen.set_size(16*6, 9*2);
+ screen.set_visarea(0, 16*6-1, 0, 9*2-3);
+ screen.set_screen_update("hd44780", FUNC(hd44780_device::screen_update));
+ screen.set_palette("palette");
+ PALETTE(config, "palette", FUNC(mephisto_display_module2_device::lcd_palette), 2);
+
+ HD44780(config, m_lcdc, 0);
+ m_lcdc->set_lcd_size(2, 16);
+
+ /* sound hardware */
+ SPEAKER(config, "speaker").front_center();
+ DAC_2BIT_BINARY_WEIGHTED_ONES_COMPLEMENT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.25);
+ voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
+ vref.add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
+ vref.add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT);
+}
+
+void mephisto_display_module2_device::lcd_palette(palette_device &palette) const
+{
+ palette.set_pen_color(0, rgb_t(138, 146, 148));
+ palette.set_pen_color(1, rgb_t(92, 83, 88));
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void mephisto_display_module2_device::device_start()
+{
+ save_item(NAME(m_latch));
+ save_item(NAME(m_ctrl));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void mephisto_display_module2_device::device_reset()
+{
+ m_latch = 0;
+ m_ctrl = 0;
+}
+
+
+//-------------------------------------------------
+// I/O handlers
+//-------------------------------------------------
+
+WRITE8_MEMBER(mephisto_display_module2_device::latch_w)
+{
+ m_latch = data;
+}
+
+WRITE8_MEMBER(mephisto_display_module2_device::io_w)
+{
+ if (BIT(data, 1) && !BIT(m_ctrl, 1))
+ m_lcdc->write(BIT(data, 0), m_latch);
+
+ m_dac->write(data >> 2 & 3);
+
+ m_ctrl = data;
+}