diff --git a/src/mame/drivers/rainbow.cpp b/src/mame/drivers/rainbow.cpp
index 78190d9141a..0af536e0107 100644
--- a/src/mame/drivers/rainbow.cpp
+++ b/src/mame/drivers/rainbow.cpp
@@ -2336,7 +2336,7 @@ WRITE_LINE_MEMBER(rainbow_state::irq_hi_w)
 #ifdef		ASSUME_MODEL_A_HARDWARE
 	m_irq_high = 0;
 #else
-	m_irq_high = (state == ASSERT_LINE) ? 0x80 : 0;
+	m_irq_high = (state == ASSERT_LINE) ? 0 : 0x80;
 #endif
 }
 
diff --git a/src/mame/drivers/vt240.cpp b/src/mame/drivers/vt240.cpp
index 74ba3497b71..b6d19665ec3 100644
--- a/src/mame/drivers/vt240.cpp
+++ b/src/mame/drivers/vt240.cpp
@@ -123,7 +123,7 @@ WRITE_LINE_MEMBER(vt240_state::write_keyboard_clock)
 
 WRITE_LINE_MEMBER(vt240_state::lben_w)
 {
-	m_lb = state ? false : true;
+	m_lb = state ? true : false;
 }
 
 WRITE_LINE_MEMBER(vt240_state::t11_reset_w)