diff --git a/src/mame/drivers/8080bw.cpp b/src/mame/drivers/8080bw.cpp
index 63f69dabdf5..fce3ba4df08 100644
--- a/src/mame/drivers/8080bw.cpp
+++ b/src/mame/drivers/8080bw.cpp
@@ -5310,6 +5310,7 @@ ROM_END
 ROM_START( polariso )
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "ps01.ic71",    0x0000, 0x0800, CRC(c04ce5a9) SHA1(62cc9b3b682ebecfb7600393862c65e26ff5263f) )
+	ROM_LOAD( "ps02.ic70",    0x0800, 0x0800, CRC(18648e4f) SHA1(9f672e108177d5d9bc004b41eec00dc4d19269ff) )
 	ROM_LOAD( "ps03.ic69",    0x1000, 0x0800, CRC(8680d7ea) SHA1(7fd4b8a415666c36842fed80d2798b48f8b29d0d) )
 	ROM_LOAD( "ps04.ic62",    0x1800, 0x0800, CRC(65694948) SHA1(de92a7f3e3ef732b573254baa60df60f8e068a5d) )
 	ROM_LOAD( "ps05.ic61",    0x4000, 0x0800, CRC(772e31f3) SHA1(fa0b866b6df1a9217e286ca880b3bb3fb0644bf3) )