diff --git a/src/mess/drivers/victor9k.c b/src/mess/drivers/victor9k.c
index c489ca874cc..9c1dc48e441 100644
--- a/src/mess/drivers/victor9k.c
+++ b/src/mess/drivers/victor9k.c
@@ -395,6 +395,15 @@ void victor9k_state::machine_start()
 	// memory banking
 	address_space &program = m_maincpu->space(AS_PROGRAM);
 	program.install_ram(0x00000, m_ram->size() - 1, m_ram->pointer());
+
+	// patch out SCP self test
+	m_rom->base()[0x11ab] = 0xc3;
+
+	// patch out ROM checksum error
+	m_rom->base()[0x1d51] = 0x90;
+	m_rom->base()[0x1d52] = 0x90;
+	m_rom->base()[0x1d53] = 0x90;
+	m_rom->base()[0x1d54] = 0x90;
 }
 
 void victor9k_state::machine_reset()
diff --git a/src/mess/includes/victor9k.h b/src/mess/includes/victor9k.h
index 08030027cdc..11344f75704 100644
--- a/src/mess/includes/victor9k.h
+++ b/src/mess/includes/victor9k.h
@@ -71,6 +71,7 @@ public:
 		m_rs232a(*this, RS232_A_TAG),
 		m_rs232b(*this, RS232_B_TAG),
 		m_palette(*this, "palette"),
+		m_rom(*this, I8088_TAG),
 		m_video_ram(*this, "video_ram"),
 		m_brt(0),
 		m_cont(0),
@@ -97,6 +98,7 @@ public:
 	required_device<rs232_port_device> m_rs232a;
 	required_device<rs232_port_device> m_rs232b;
 	required_device<palette_device> m_palette;
+	required_memory_region m_rom;
 	required_shared_ptr<UINT8> m_video_ram;
 
 	virtual void machine_start();