I believe we should mask here on external bus access

mamehaze · Dec 13, 2024 · 64613bb · 64613bb
1 parent 6169926
commit 64613bb
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Showing 2 changed files with 5 additions and 6 deletions.
diff --git a/src/devices/cpu/m6502/xavix.cpp b/src/devices/cpu/m6502/xavix.cpp
@@ -152,12 +152,12 @@ inline uint8_t xavix_device::read_full_data(uint8_t databank, uint16_t adr)
 		}
 		else
 		{
-			return m_extbus_space->read_byte((databank << 16) | adr);
+			return m_extbus_space->read_byte(((databank << 16) | adr) & 0x7fffff);
 		}
 	}
 	else
 	{
-		return m_extbus_space->read_byte((databank << 16) | adr);
+		return m_extbus_space->read_byte(((databank << 16) | adr) & 0x7fffff);
 	}
 }
 
@@ -257,12 +257,12 @@ inline void xavix_device::write_full_data(uint8_t databank, uint16_t adr, uint8_
 		}
 		else
 		{
-			m_extbus_space->write_byte((databank << 16) | adr, val);
+			m_extbus_space->write_byte(((databank << 16) | adr) & 0x7fffff, val);
 		}
 	}
 	else
 	{
-		m_extbus_space->write_byte((databank << 16) | adr, val);
+		m_extbus_space->write_byte(((databank << 16) | adr) & 0x7fffff, val);
 	}
 }
 

diff --git a/src/mame/tvgames/xavix_2002.cpp b/src/mame/tvgames/xavix_2002.cpp
@@ -399,10 +399,9 @@ DEVICE_IMAGE_LOAD_MEMBER(xavix2002_super_tv_pc_state::cart_load)
 void xavix2002_super_tv_pc_state::xavix_extbus_map(address_map &map)
 {
 	map(0x000000, 0x7fffff).rom().region("bios", 0x00000).mirror(0x800000);
-	map(0xe00000, 0xe7ffff).ram(); // writes here
+	map(0x600000, 0x67ffff).ram(); // writes here
 }
 
-
 void xavix2002_super_tv_pc_state::xavix2002_super_tv_pc(machine_config& config)
 {
 	xavix2002(config);