diff --git a/src/mame/audio/rax.cpp b/src/mame/audio/rax.cpp
index 1255be6efa3..79c7a4bacea 100644
--- a/src/mame/audio/rax.cpp
+++ b/src/mame/audio/rax.cpp
@@ -408,10 +408,10 @@ void acclaim_rax_device::adsp_sound_tx_callback(offs_t offset, uint32_t data)
 	if (which != 0)
 		return;
 
-	int autobuf_reg = which ? S1_AUTOBUF_REG : S0_AUTOBUF_REG;
+	int autobuf_reg = which ? S1_AUTOBUF_REG : S0_AUTOBUF_REG; // "which" must equal 0 here, invalid test: Coverity 315932
 
 	/* check if SPORT1 is enabled */
-	if (m_control_regs[SYSCONTROL_REG] & (which ? 0x0800 : 0x1000)) /* bit 11 */
+	if (m_control_regs[SYSCONTROL_REG] & (which ? 0x0800 : 0x1000)) /* bit 11 */ // invalid test here too
 	{
 		/* we only support autobuffer here (which is what this thing uses), bail if not enabled */
 		if (m_control_regs[autobuf_reg] & 0x0002) /* bit 1 */
@@ -458,7 +458,7 @@ void acclaim_rax_device::adsp_sound_tx_callback(offs_t offset, uint32_t data)
 
 void acclaim_rax_device::dmovlay_callback(uint32_t data)
 {
-	if (data < 0 || data > 1)
+	if (data > 1)
 	{
 		fatalerror("dmovlay_callback: Error! dmovlay called with value = %X\n", data);
 	}
diff --git a/src/mame/video/psikyo.cpp b/src/mame/video/psikyo.cpp
index adb01b282b0..c505c1680ce 100644
--- a/src/mame/video/psikyo.cpp
+++ b/src/mame/video/psikyo.cpp
@@ -515,7 +515,7 @@ u32 psikyo_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, con
 		m_tilemap[layer]->set_transparent_pen((layer_ctrl[layer] & 8 ? 0 : 15));
 	}
 
-	// TODO : is this correct?
+	// TODO : is this correct? // Note layers_ctrl is hardcoded to -1 above: Coverity 315110
 	if (layers_ctrl & 1)
 		bgpen = m_palette->pen(((layer_ctrl[0] & 8) ? 0x800 : 0x80f));
 	else if (layers_ctrl & 2)
@@ -635,7 +635,7 @@ u32 psikyo_state::screen_update_bootleg(screen_device &screen, bitmap_rgb32 &bit
 		m_tilemap[layer]->set_transparent_pen((layer_ctrl[layer] & 8 ? 0 : 15));
 	}
 
-	// TODO : is this correct?
+	// TODO : is this correct? // Note layers_ctrl is hardcoded to -1 above: Coverity 315935
 	if (layers_ctrl & 1)
 		bgpen = m_palette->pen(((layer_ctrl[0] & 8) ? 0x800 : 0x80f));
 	else if (layers_ctrl & 2)