diff --git a/src/mame/drivers/enmirage.cpp b/src/mame/drivers/enmirage.cpp
index 3aff190371d..5684c66d0fe 100644
--- a/src/mame/drivers/enmirage.cpp
+++ b/src/mame/drivers/enmirage.cpp
@@ -171,7 +171,7 @@ static void ensoniq_floppies(device_slot_interface &device)
 
 uint8_t enmirage_state::mirage_adc_read()
 {
-	uint8_t value;
+	uint8_t value = 0;
 	switch(m_mux_value & 0x03)
 	{
 		case 0:
diff --git a/src/mame/drivers/royalmah.cpp b/src/mame/drivers/royalmah.cpp
index abd99d8190b..c4ae4be0222 100644
--- a/src/mame/drivers/royalmah.cpp
+++ b/src/mame/drivers/royalmah.cpp
@@ -5519,7 +5519,7 @@ void royalmah_state::init_mjsenka()
 		rom[i] = bitswap<8>(rom[i], 0, 6, 5, 4, 3, 1, 2, 7);
 	}
 
-	m_mainopbank->configure_entries(0, 8, m_decrypted_opcodes + 0x8000, 0x400);
+	m_mainopbank->configure_entries(0, 8, &m_decrypted_opcodes[0x8000], 0x400);
 
 	init_chalgirl();
 }
diff --git a/src/mame/drivers/stv.cpp b/src/mame/drivers/stv.cpp
index 61f259ccf11..68f70050581 100644
--- a/src/mame/drivers/stv.cpp
+++ b/src/mame/drivers/stv.cpp
@@ -191,10 +191,10 @@ uint8_t stv_state::critcrsh_ioga_r(offs_t offset)
 
 void stv_state::critcrsh_ioga_w(offs_t offset, uint8_t data)
 {
+	static uint8_t const bcd2hex[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x07, 0x7f, 0x67, 0x58, 0x4c, 0x62, 0x49, 0x78, 0x00 }; // TODO: chip type unknown
 	switch (offset * 2 + 1)
 	{
 		case 0x0b:
-			static uint8_t bcd2hex[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7c, 0x07, 0x7f, 0x67, 0x58, 0x4c, 0x62, 0x49, 0x78, 0x00 }; // TODO: chip type unknown
 			m_cc_digits[0] = bcd2hex[(data & 0xf0) >> 4];
 			m_cc_digits[1] = bcd2hex[data & 0x0f];
 			break;