taito/taito_o.cpp: tie irq 7 to all clear switch, allows game init from user side

src/mame/snk/dmndrby.cpp

@@ -946,7 +946,7 @@ ROM_END
 } // anonymous namespace
 
 
-//    YEAR, NAME,      PARENT,  MACHINE,  INPUT,    STATE,         INIT,       MONITOR, COMPANY,                    FULLNAME                                  FLAGS
 GAME( 1994, dmndrby,   0,       dderby,   dderby,   dmndrby_state, empty_init, ROT0,    "Electrocoin",              "Diamond Derby (Win bet, newer)",                  MACHINE_IMPERFECT_COLORS | MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // hack?
 GAME( 1986, dmndrbya,  dmndrby, dderby,   dderbya,  dmndrby_state, empty_init, ROT0,    "Electrocoin",              "Diamond Derby (Win bet, original)",               MACHINE_IMPERFECT_COLORS | MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )
 GAME( 1986, dmndrbybl, dmndrby, dderby,   dderbybl, dmndrby_quinella_state, empty_init, ROT0,    "bootleg (EDG Impeuropex)", "Diamond Derby (Quinella bet, EDG Impeuropex bootleg)", MACHINE_IMPERFECT_COLORS | MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )
+// Original Japanese Quinella version known to exist, cfr. flyer, published by Tsumara Ltd. (SNK spin-off?)

src/mame/taito/taito_o.cpp

@@ -29,9 +29,6 @@ Eibise                 (C) 1990 Taito.
 
 TODO:
 
-- Opto coin chutes, similar if not same as taito/pkspirit.cpp
-- parentj: throws "MESSAGE ERROR" on boot, hold ALL CLEAR SW and RESET (keys 9 and R) for a little while.
-  Notice that holding SERVICE1 (reset) implicitly means no NVRAM restore.
 - parentj: lower part of dealer arm GFX is x flipped,
   is it even supposed to be shown but rather be masked by the text layer?
 - eibise: middle reel shows sprite wraparound glitch;
@@ -40,7 +37,9 @@ TODO:
 
 Notes:
 - Press R to reset errors;
-
+- parentj: if it throws "MESSAGE ERROR" on boot then it needs All Clear SW being pressed,
+  which in turn is tied to irq 7 service for proper initialization of NVRAM.
+  POST expect that a credit string is available at $10156a cfr. https://tcrf.net/Parent_Jack
 
 **************************************************************************************************/
 
@@ -82,6 +81,7 @@ public:
 	{ }
 
 	void taitoo(machine_config &config);
+	DECLARE_INPUT_CHANGED_MEMBER(all_clear_cb);
 
 private:
 	// devices
@@ -179,6 +179,14 @@ void taitoo_state::prg_map(address_map &map)
 	map(0x500800, 0x500fff).ram().w(m_palette, FUNC(palette_device::write16)).share("palette");
 }
 
+INPUT_CHANGED_MEMBER(taitoo_state::all_clear_cb)
+{
+	if (oldval && !newval)
+		m_maincpu->set_input_line(7, HOLD_LINE);
+}
+
+
+
 static INPUT_PORTS_START( parentj )
 	PORT_START("COIN")
 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 ) PORT_WRITE_LINE_DEVICE_MEMBER("opto1", taitoio_opto_device, coin_sense_w)
@@ -207,7 +215,7 @@ static INPUT_PORTS_START( parentj )
 	PORT_BIT (0x0001, IP_ACTIVE_LOW, IPT_OTHER )            PORT_NAME("Hopper Over") // "Hop Over"?
 	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("opto2", taitoio_opto_device, opto_h_r)
 	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("opto2", taitoio_opto_device, opto_l_r)
-	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_GAMBLE_SERVICE )   PORT_NAME("All Clear SW")
+	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_GAMBLE_SERVICE )   PORT_NAME("All Clear SW") PORT_CHANGED_MEMBER(DEVICE_SELF, taitoo_state, all_clear_cb, 0)
 	PORT_SERVICE_NO_TOGGLE(0x0010, IP_ACTIVE_LOW )
 	PORT_BIT( 0x00e0, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_UNKNOWN ) // battery error if '1'
@@ -252,6 +260,7 @@ static INPUT_PORTS_START( parentj )
 	PORT_DIPUNUSED_DIPLOC( 0x80, 0x80, "DSWB:1" )
 INPUT_PORTS_END
 
+
 static INPUT_PORTS_START( eibise )
 	PORT_START("COIN")
 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 ) PORT_WRITE_LINE_DEVICE_MEMBER("opto1", taitoio_opto_device, coin_sense_w)