diff --git a/src/mame/drivers/unk6502_st2xxx.cpp b/src/mame/drivers/unk6502_st2xxx.cpp
index 0573fb64299..24ddb72fd62 100644
--- a/src/mame/drivers/unk6502_st2xxx.cpp
+++ b/src/mame/drivers/unk6502_st2xxx.cpp
@@ -118,7 +118,9 @@ void bbl380_state::bbl380(machine_config &config)
 
 ROM_START( bbl380 )
 	ROM_REGION( 0x800000, "maincpu", ROMREGION_ERASEFF )
-	ROM_LOAD( "bbl380_st2205u.bin", 0x000000, 0x004000, NO_DUMP ) // internal OTPROM BIOS
+	ROM_LOAD( "bbl380_st2205u.bin", 0x000000, 0x004000, NO_DUMP ) // internal OTPROM BIOS (addresses are different from other sets)
+
+	ROM_REGION( 0x800000, "spi", ROMREGION_ERASEFF )
 	ROM_LOAD( "bbl 380 180 in 1.bin", 0x000000, 0x400000, CRC(146c88da) SHA1(7f18526a6d8cf991f86febce3418d35aac9f49ad) BAD_DUMP )
 	// 0x0022XX, 0x0026XX, 0x002AXX, 0x002CXX, 0x002DXX, 0x0031XX, 0x0036XX, etc. should not be FF fill
 ROM_END
@@ -126,19 +128,25 @@ ROM_END
 
 ROM_START( ragc153 )
 	ROM_REGION( 0x800000, "maincpu", ROMREGION_ERASEFF )
-	ROM_LOAD( "ragc153_st2205u.bin", 0x000000, 0x004000, NO_DUMP ) // internal OTPROM BIOS (addresses are different from bbl380)
+	ROM_LOAD( "st2x_internal.bin", 0x000000, 0x002000, BAD_DUMP CRC(f4dc1fc2) SHA1(bbc11539c48eb612ebae50da45e03b6fde440941) ) // internal OTPROM BIOS, dumped from dgun2953 PCB, 6000-7fff range
+
+	ROM_REGION( 0x800000, "spi", ROMREGION_ERASEFF )
 	ROM_LOAD( "25q32ams.bin", 0x000000, 0x400000, CRC(de328d73) SHA1(d17b97e9057be4add68b9f5a26e04c9f0a139673) ) // first 0x100 bytes would read as 0xff at regular speed, but give valid looking consistent data at a slower rate
 ROM_END
 
 ROM_START( dphh8630 )
 	ROM_REGION( 0x800000, "maincpu", ROMREGION_ERASEFF )
-	ROM_LOAD( "ragc153_st2205u.bin", 0x000000, 0x004000, NO_DUMP ) // internal OTPROM BIOS
+	ROM_LOAD( "st2x_internal.bin", 0x000000, 0x002000, BAD_DUMP CRC(f4dc1fc2) SHA1(bbc11539c48eb612ebae50da45e03b6fde440941) ) // internal OTPROM BIOS, dumped from dgun2953 PCB, 6000-7fff range
+
+	ROM_REGION( 0x800000, "spi", ROMREGION_ERASEFF )
 	ROM_LOAD( "bg25q16.bin", 0x000000, 0x200000, CRC(277850d5) SHA1(740087842e1e63bf99b4ca9c1b2053361f267269) )
 ROM_END
 
 ROM_START( dgun2953 )
 	ROM_REGION( 0x800000, "maincpu", ROMREGION_ERASEFF )
-	ROM_LOAD( "dgun2953_st2205u.bin", 0x000000, 0x004000, NO_DUMP ) // internal OTPROM BIOS
+	ROM_LOAD( "st2x_internal.bin", 0x000000, 0x002000, BAD_DUMP CRC(f4dc1fc2) SHA1(bbc11539c48eb612ebae50da45e03b6fde440941) ) // internal OTPROM BIOS, dumped from dgun2953 PCB, 6000-7fff range
+
+	ROM_REGION( 0x800000, "spi", ROMREGION_ERASEFF )
 	ROM_LOAD( "dg160_25x32v_ef3016.bin", 0x000000, 0x400000, CRC(2e993bac) SHA1(4b310e326a47df1980aeef38aa9a59018d7fe76f) )
 ROM_END
 
@@ -146,13 +154,15 @@ ROM_END
 
 void bbl380_state::init_ragc153()
 {
-	uint8_t *ROM = memregion("maincpu")->base();
-	int size = memregion("maincpu")->bytes();
+#if 0 // probably done in software or by hardware DMA
+	uint8_t *ROM = memregion("spi")->base();
+	int size = memregion("spi")->bytes();
 
 	for (int i = 0; i < size; i++)
 	{
 		ROM[i] = ROM[i] ^ 0xe4;
 	}
+#endif
 }
 
 CONS( 200?, bbl380,        0,       0,      bbl380,   bbl380, bbl380_state, empty_init, "BaoBaoLong", "BBL380 - 180 in 1", MACHINE_IS_SKELETON )