scptchess:correct dac polarity

felipesanches · Sep 12, 2024 · fbe7a1d · fbe7a1d
1 parent 5ba1819
commit fbe7a1d
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/src/mame/cxg/computachess.cpp b/src/mame/cxg/computachess.cpp
@@ -130,7 +130,7 @@ void computachess_state::mux_w(u8 data)
 void computachess_state::control_w(u16 data)
 {
 	// D0: speaker out
-	m_dac->write(data & 1);
+	m_dac->write(~data & 1);
 
 	// D2,D3: led select
 	m_display->write_my(~data >> 2 & 3);
@@ -208,6 +208,8 @@ void computachess_state::scptchess(machine_config &config)
 void computachess_state::scptchessa(machine_config &config)
 {
 	scptchess(config);
+
+	m_maincpu->write_d().set(FUNC(computachess_state::control_w)).exor(1);
 	config.set_default_layout(layout_cxg_scptchessa);
 }
 

diff --git a/src/mame/saitek/tschess.cpp b/src/mame/saitek/tschess.cpp
@@ -5,7 +5,7 @@
 
 SciSys Travel Sensor Chess (aka Travel Sensor)
 
-The chess engine was written by Mark Taylor, employee at Intelligent Software
+The chess engine was written by Mark Taylor, employee of Intelligent Software
 (formerly known as Philidor Software). The I/O is very similar to CXG Sensor
 Computachess (see cxg/computachess.cpp).
 
@@ -100,7 +100,7 @@ void tschess_state::control_w(u16 data)
 	m_display->write_my(~data >> 1 & 7);
 
 	// D4: speaker out
-	m_dac->write(data >> 4 & 1);
+	m_dac->write(BIT(data, 4));
 }
 
 u16 tschess_state::input_r()