diff --git a/src/mame/sinclair/scorpion.cpp b/src/mame/sinclair/scorpion.cpp
index 83988c636f2..97f37fdaa2d 100644
--- a/src/mame/sinclair/scorpion.cpp
+++ b/src/mame/sinclair/scorpion.cpp
@@ -934,7 +934,7 @@ ROM_END
 
 ROM_START(scorpiontb)
 	ROM_REGION(0x90000, "maincpu", 0)
-	ROM_DEFAULT_BIOS("v4.41lg_uni")
+	ROM_DEFAULT_BIOS("v4.43su")
 
 	ROM_SYSTEM_BIOS(0, "v3.9f", "ProfROM V.3.9f")
 	ROMX_LOAD( "prof_39f.rom", 0x010000, 0x20000, CRC(c55e64da) SHA1(cec7770fe26350f57f6c325a29db78787dc4521e), ROM_BIOS(0))
@@ -990,8 +990,10 @@ ROM_START(scorpiontb)
 	ROMX_LOAD( "prof4xx041.8689lg_3d2f.rom", 0x010000, 0x40000, CRC(01c7390a) SHA1(84d4518d751979722fde834c568fa652058e55fa), ROM_BIOS(25))
 	ROM_SYSTEM_BIOS(26, "v4.41lg_uni", "ProfROM V.4.xx.041.8689 (Basic Looking Glass) (UNI)")
 	ROMX_LOAD( "prof4xx041.8689lg_uni.rom", 0x010000, 0x40000, CRC(62df1e38) SHA1(6df006eb8429464c54097f10b6ef2731c52f91b9), ROM_BIOS(26))
-	ROM_SYSTEM_BIOS(27, "scorp_test", "Scorpion Test")
-	ROMX_LOAD( "scorp_test.rom", 0x010000, 0x10000, CRC(e0230ca7) SHA1(f38e4d23cb29b4ae3fe8b00a52d7b0f9bb845407), ROM_BIOS(27))
+	ROM_SYSTEM_BIOS(27, "v4.43su", "ProfROM V.4.xx.043.9226su (1024) (1FFD)")
+	ROMX_LOAD( "prof4xx043.9226su_1024_1ffd.rom", 0x010000, 0x40000, CRC(2d13296d) SHA1(02b94e78f0c058ca5762d67401946892df43b49c), ROM_BIOS(27))
+	ROM_SYSTEM_BIOS(28, "scorp_test", "Scorpion Test")
+	ROMX_LOAD( "scorp_test.rom", 0x010000, 0x10000, CRC(e0230ca7) SHA1(f38e4d23cb29b4ae3fe8b00a52d7b0f9bb845407), ROM_BIOS(28))
 ROM_END
 
 ROM_START(scorpiongmx)