diff --git a/src/mame/drivers/mitchell.cpp b/src/mame/drivers/mitchell.cpp
index 6189495485d..000f478c043 100644
--- a/src/mame/drivers/mitchell.cpp
+++ b/src/mame/drivers/mitchell.cpp
@@ -2303,27 +2303,27 @@ DRIVER_INIT_MEMBER(mitchell_state,hatena)
 DRIVER_INIT_MEMBER(mitchell_state,spang)
 {
 	m_input_type = 3;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xe000], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	configure_banks(spang_decode);
 }
 
 DRIVER_INIT_MEMBER(mitchell_state,spangbl)
 {
 	m_input_type = 3;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xe000], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	bootleg_decode();
 }
 
 DRIVER_INIT_MEMBER(mitchell_state,spangj)
 {
 	m_input_type = 3;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xe000], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	configure_banks(spangj_decode);
 }
 DRIVER_INIT_MEMBER(mitchell_state,sbbros)
 {
 	m_input_type = 3;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xe000], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	configure_banks(sbbros_decode);
 }
 DRIVER_INIT_MEMBER(mitchell_state,qtono1)
@@ -2367,13 +2367,13 @@ DRIVER_INIT_MEMBER(mitchell_state,marukin)
 DRIVER_INIT_MEMBER(mitchell_state,block)
 {
 	m_input_type = 2;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xff80], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	configure_banks(block_decode);
 }
 DRIVER_INIT_MEMBER(mitchell_state,blockbl)
 {
 	m_input_type = 2;
-	m_nvram->set_base(&memregion("maincpu")->base()[0xff80], 0x80); /* NVRAM */
+	m_nvram->set_base(m_mainram, m_mainram.bytes());
 	bootleg_decode();
 }
 
diff --git a/src/mame/includes/mitchell.h b/src/mame/includes/mitchell.h
index 01ccf76b793..7b85ad26240 100644
--- a/src/mame/includes/mitchell.h
+++ b/src/mame/includes/mitchell.h
@@ -30,6 +30,7 @@ public:
 		m_soundlatch(*this, "soundlatch"),
 		m_colorram(*this, "colorram"),
 		m_videoram(*this, "videoram"),
+		m_mainram(*this, "ram"),
 		m_bank1(*this, "bank1"),
 		m_bank0d(*this, "bank0d"),
 		m_bank1d(*this, "bank1d"),
@@ -50,6 +51,7 @@ public:
 	/* memory pointers */
 	required_shared_ptr<uint8_t> m_colorram;
 	required_shared_ptr<uint8_t> m_videoram;
+	optional_shared_ptr<uint8_t> m_mainram;
 	required_memory_bank m_bank1;
 	optional_memory_bank m_bank0d;
 	optional_memory_bank m_bank1d;