regence: add power-off nmi

src/mame/appliedconcepts/ggm.cpp

@@ -8,7 +8,7 @@ Applied Concepts Great Game Machine (GGM), electronic board game computer.
 
 Hardware notes:
 - 6502A 2MHz, SYP6522 VIA
-- 2KB RAM(4*HM472114AP-2 or 1*M58725P), no ROM on main PCB
+- 2KB battery-backed RAM(4*HM472114AP-2 or 1*M58725P), no ROM on main PCB
 - 2*74164 shift register, 3*6118P VFD driver
 - 8-digit 14seg VFD panel (same one as in Speak & Spell)
 - 5*4 keypad(unlabeled by default), 1-bit sound

src/mame/chess/regence.cpp

@@ -11,16 +11,20 @@ Hardware notes:
 - PCB label: FRANCE DOUBLE R, MADE IN FRANCE
 - Sharp LH0080A Z80A @ 4 MHz (8MHz XTAL)
 - 3*4KB ROM, sockets support up to 48KB ROM
-- 2KB RAM (MSM5128-15RS), 3 sockets, only middle one used
+- 2KB battery-backed RAM (MSM5128-15RS), 3 sockets, only middle one used. Power-off
+  or power outage triggers an NMI. If this isn't done, the next power-on may fail.
 - TTL, piezo, 8*8+4 LEDs, magnetic sensors
 
 ******************************************************************************/
 
 #include "emu.h"
+
 #include "cpu/z80/z80.h"
+#include "machine/nvram.h"
 #include "machine/sensorboard.h"
 #include "sound/dac.h"
 #include "video/pwm.h"
+
 #include "speaker.h"
 
 // internal artwork
@@ -41,11 +45,14 @@ public:
 		m_inputs(*this, "IN.%u", 0)
 	{ }
 
+	DECLARE_INPUT_CHANGED_MEMBER(power) { if (newval && m_power) power_off(); }
+
 	// machine configs
 	void regence(machine_config &config);
 
 protected:
 	virtual void machine_start() override;
+	virtual void machine_reset() override { m_power = true; }
 
 private:
 	// devices/pointers
@@ -64,6 +71,9 @@ private:
 	void leds_w(u8 data);
 	u8 input_r();
 
+	void power_off();
+	bool m_power = false;
+
 	u8 m_inp_mux = 0;
 	u8 m_led_data = 0;
 };
@@ -71,10 +81,18 @@ private:
 void regence_state::machine_start()
 {
 	// register for savestates
+	save_item(NAME(m_power));
 	save_item(NAME(m_inp_mux));
 	save_item(NAME(m_led_data));
 }
 
+void regence_state::power_off()
+{
+	// NMI at power-off (it prepares nvram for next power-on)
+	m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
+	m_power = false;
+}
+
 
 
 /******************************************************************************
@@ -132,7 +150,7 @@ void regence_state::main_map(address_map &map)
 	map(0x0000, 0x0fff).rom();
 	map(0x4000, 0x4fff).rom();
 	map(0x8000, 0x8fff).rom();
-	map(0xd000, 0xd7ff).ram();
+	map(0xd000, 0xd7ff).ram().share("nvram");
 	map(0xf000, 0xf000).rw(FUNC(regence_state::input_r), FUNC(regence_state::control_w));
 	map(0xf800, 0xf800).w(FUNC(regence_state::leds_w));
 }
@@ -163,6 +181,9 @@ static INPUT_PORTS_START( regence )
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_1_PAD) PORT_NAME("Pawn")
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_2_PAD) PORT_NAME("Knight")
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+	PORT_START("POWER") // needs to be triggered for nvram to work
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_OTHER) PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, regence_state, power, 0) PORT_NAME("Power Off")
 INPUT_PORTS_END
 
 
@@ -173,21 +194,24 @@ INPUT_PORTS_END
 
 void regence_state::regence(machine_config &config)
 {
-	/* basic machine hardware */
+	// basic machine hardware
 	Z80(config, m_maincpu, 8_MHz_XTAL/2);
 	m_maincpu->set_addrmap(AS_PROGRAM, &regence_state::main_map);
 
 	m_maincpu->set_periodic_int(FUNC(regence_state::irq0_line_hold), attotime::from_hz(448)); // from 555, measured
 
+	NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
+
 	SENSORBOARD(config, m_board).set_type(sensorboard_device::MAGNETS);
 	m_board->init_cb().set(m_board, FUNC(sensorboard_device::preset_chess));
 	m_board->set_delay(attotime::from_msec(150));
+	m_board->set_nvram_enable(true);
 
-	/* video hardware */
+	// video hardware
 	PWM_DISPLAY(config, m_display).set_size(10, 8);
 	config.set_default_layout(layout_regence);
 
-	/* sound hardware */
+	// sound hardware
 	SPEAKER(config, "speaker").front_center();
 	DAC_1BIT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.25);
 }

src/mame/novag/const.cpp

@@ -39,7 +39,8 @@ Constellation Quattro:
 
 Super Sensor IV:
 - MOS MPS6502A @ 2MHz
-- 1KB battery-backed RAM (2*TC5514AP-3)
+- 1KB battery-backed RAM (2*TC5514AP-3). Power-off or power outage triggers
+  an NMI. If this isn't done, the next power-on may fail.
 - 8KB ROM (TMM2364P)
 - 2 ROM sockets for expansion (blue @ u6, white @ u5)
 
@@ -350,7 +351,7 @@ INPUT_PORTS_END
 
 void const_state::nconst(machine_config &config)
 {
-	/* basic machine hardware */
+	// basic machine hardware
 	M6502(config, m_maincpu, 2_MHz_XTAL);
 	m_maincpu->set_addrmap(AS_PROGRAM, &const_state::const_map);
 
@@ -362,11 +363,11 @@ void const_state::nconst(machine_config &config)
 	m_board->init_cb().set(m_board, FUNC(sensorboard_device::preset_chess));
 	m_board->set_delay(attotime::from_msec(250));
 
-	/* video hardware */
+	// video hardware
 	PWM_DISPLAY(config, m_display).set_size(3, 8);
 	config.set_default_layout(layout_novag_const);
 
-	/* sound hardware */
+	// sound hardware
 	SPEAKER(config, "mono").front_center();
 	BEEP(config, m_beeper, 2_MHz_XTAL / 0x800); // ~976Hz
 	m_beeper->add_route(ALL_OUTPUTS, "mono", 0.25);
@@ -376,7 +377,7 @@ void const_state::ssensor4(machine_config &config)
 {
 	nconst(config);
 
-	/* basic machine hardware */
+	// basic machine hardware
 	m_maincpu->set_addrmap(AS_PROGRAM, &const_state::ssensor4_map);
 
 	subdevice<clock_device>("irq_clock")->set_pulse_width(attotime::from_usec(39)); // irq active for 39us
@@ -386,7 +387,7 @@ void const_state::ssensor4(machine_config &config)
 
 	config.set_default_layout(layout_novag_ssensor4);
 
-	/* expansion */
+	// expansion
 	GENERIC_SOCKET(config, "exrom", generic_plain_slot, "novag_ssensor4");
 	SOFTWARE_LIST(config, "cart_list").set_original("novag_ssensor4");
 }
@@ -395,7 +396,7 @@ void const_state::nconst36(machine_config &config)
 {
 	nconst(config);
 
-	/* basic machine hardware */
+	// basic machine hardware
 	M65SC02(config.replace(), m_maincpu, 7.2_MHz_XTAL/2);
 	m_maincpu->set_addrmap(AS_PROGRAM, &const_state::const_map);
 
@@ -403,7 +404,7 @@ void const_state::nconst36(machine_config &config)
 
 	m_board->set_delay(attotime::from_msec(200));
 
-	/* sound hardware */
+	// sound hardware
 	BEEP(config.replace(), m_beeper, 7.2_MHz_XTAL/2 / 0x800); // ~1758Hz
 	m_beeper->add_route(ALL_OUTPUTS, "mono", 0.25);
 }
@@ -412,14 +413,14 @@ void const_state::nconst36a(machine_config &config)
 {
 	nconst36(config);
 
-	/* basic machine hardware */
+	// basic machine hardware
 	R65C02(config.replace(), m_maincpu, 7.2_MHz_XTAL/2);
 	m_maincpu->set_addrmap(AS_PROGRAM, &const_state::const_map);
 
 	// 4020 CLK is 7.2_MHz_XTAL/4, but with IRQ on Q11 instead of Q12, result
 	// frequency and duty cycle are identical to nconst36
 
-	/* sound hardware */
+	// sound hardware
 	BEEP(config.replace(), m_beeper, 7.2_MHz_XTAL/4 / 0x800); // ~879Hz
 	m_beeper->add_route(ALL_OUTPUTS, "mono", 0.25);
 }
@@ -428,14 +429,14 @@ void const_state::nconstq(machine_config &config)
 {
 	nconst36a(config);
 
-	/* basic machine hardware */
+	// basic machine hardware
 	m_maincpu->set_clock(8_MHz_XTAL/2);
 
 	subdevice<clock_device>("irq_clock")->set_clock(8_MHz_XTAL/4 / 0x1000); // ~488Hz (pulse width same as nconst)
 
 	config.set_default_layout(layout_novag_constq);
 
-	/* sound hardware */
+	// sound hardware
 	BEEP(config.replace(), m_beeper, 8_MHz_XTAL/4 / 0x800); // ~976Hz
 	m_beeper->add_route(ALL_OUTPUTS, "mono", 0.25);
 }
@@ -444,7 +445,7 @@ void const_state::sconst(machine_config &config)
 {
 	nconstq(config);
 
-	/* basic machine hardware */
+	// basic machine hardware
 	M6502(config.replace(), m_maincpu, 8_MHz_XTAL/2); // UM6502C
 	m_maincpu->set_addrmap(AS_PROGRAM, &const_state::sconst_map);
 

src/mame/saitek/ssystem3.cpp

@@ -33,6 +33,7 @@ Printer Unit:
 
 PSU ("permanent storage unit"?) is just a 256x4 battery-backed RAM (TC5501P)
 module, not sure why it was so expensive (~180DM).
+
 A chess clock accessory was also announced but unreleased.
 
 SciSys Super System IV (AKA MK IV) is on similar hardware. It was supposed to