diff --git a/src/mame/drivers/wy85.cpp b/src/mame/drivers/wy85.cpp
index 5e7288068f9..1c4038d41b4 100644
--- a/src/mame/drivers/wy85.cpp
+++ b/src/mame/drivers/wy85.cpp
@@ -171,7 +171,10 @@ void wy85_state::wy85(machine_config &config)
 
 ROM_START(wy85)
 	ROM_REGION(0x4000, "maincpu", 0)
-	ROM_LOAD("250151-04_reva.5e", 0x0000, 0x4000, CRC(8fcb9f43) SHA1(6c7e1d27fa6014870c29ab2b8b856ae412bfc411)) // 27128
+	ROM_SYSTEM_BIOS(0, "revd", "Rev. D")
+	ROMX_LOAD("23-121-r7d.5e", 0x0000, 0x4000, CRC(76203960) SHA1(ea58c7337435edb06d2d5434886a67045e96bf1f), ROM_BIOS(0))
+	ROM_SYSTEM_BIOS(1, "reva", "Rev. A")
+	ROMX_LOAD("250151-04_reva.5e", 0x0000, 0x4000, CRC(8fcb9f43) SHA1(6c7e1d27fa6014870c29ab2b8b856ae412bfc411), ROM_BIOS(1)) // 27128
 
 	ROM_REGION(0x2000, "chargen", 0)
 	ROM_LOAD("am9265.1h", 0x0000, 0x2000, CRC(5ee65b55) SHA1(a0b38a38838f262aaea22d212351e7441e4b07e8)) // AM9265EPC