diff --git a/src/mame/drivers/ksys573.cpp b/src/mame/drivers/ksys573.cpp
index c7dc6ccd9b6..781b8f4ba36 100644
--- a/src/mame/drivers/ksys573.cpp
+++ b/src/mame/drivers/ksys573.cpp
@@ -2876,6 +2876,8 @@ INPUT_PORTS_END
 	ROMX_LOAD( "700a01(gchgchmp).22g",  0x000000,  0x080000, CRC(39ebb0ca) SHA1(9aab8c637dd2be84d79007e52f108abe92bf29dd), ROM_BIOS(2) ) \
 	ROM_SYSTEM_BIOS( 2, "dsem2",      "Found on Dancing Stage Euro Mix 2" ) \
 	ROMX_LOAD( "700b01.22g",   0x0000000, 0x080000, CRC(6cf852af) SHA1(a2421d0a494892c0e71003c96995ce8f945064dd), ROM_BIOS(3) ) \
+	ROM_REGION( 0x8000, "mcu", 0 ) \
+	ROM_LOAD( "hd6473644h.18e", 0, 0x8000, NO_DUMP) \
 	ROM_REGION( 0x40, "h8_response", 0 ) \
 	ROMX_LOAD( "h8a01.bin",    0x000000, 0x000040, CRC(131e0359) SHA1(967f66578ebc0cf6b044d71af09b59bce1f4a1d0), ROM_BIOS(1) ) \
 	ROMX_LOAD( "h8a01.bin",    0x000000, 0x000040, CRC(131e0359) SHA1(967f66578ebc0cf6b044d71af09b59bce1f4a1d0), ROM_BIOS(2) ) \