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-rw-r--r--src/emu/bus/megadrive/rom.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/bus/megadrive/rom.c b/src/emu/bus/megadrive/rom.c
index c5c5b93c49f..a2c08860134 100644
--- a/src/emu/bus/megadrive/rom.c
+++ b/src/emu/bus/megadrive/rom.c
@@ -531,7 +531,7 @@ WRITE16_MEMBER(md_rom_ssf2_device::write_a13)
CODEMASTERS 2 IN 1 (RESET BASED)
-------------------------------------------------*/
-#define MD_ADDR_CM2IN1(a) (m_base == 0 ? ((a << 1) & 0x1fffff)/2 : (((a << 1) & 0x7ffff) + 0x200000)/2)
+#define MD_ADDR_CM2IN1(a) (m_base == 0 ? ((a << 1) & 0x1fffff)/2 : (((a << 1) & 0x1fffff) + 0x200000)/2)
READ16_MEMBER(md_rom_cm2in1_device::read)
{