diff --git a/src/mame/drivers/dec8.cpp b/src/mame/drivers/dec8.cpp
index 295f25423c2..3912641269c 100644
--- a/src/mame/drivers/dec8.cpp
+++ b/src/mame/drivers/dec8.cpp
@@ -3210,7 +3210,8 @@ ROM_START( csilver )
 	ROM_CONTINUE(   0x08000, 0x08000 )
 
 	ROM_REGION( 0x1000, "mcu", 0 )    /* ID8751H MCU */
-	ROM_LOAD( "id8751h.mcu", 0x0000, 0x1000, NO_DUMP ) // dx-8.19a ?
+	// 017F: B4 4C 0D : cjne  a,#$4C,$018F   (ID code 0x4c = World version)
+	ROM_LOAD( "id8751h.mcu", 0x0000, 0x1000, CRC(ca663965) SHA1(a5fb7afdfd324761bde4bb90ba12efc9954627af) ) // dx-8.19a ?
 
 	ROM_REGION( 0x08000, "gfx1", 0 )    /* characters */
 	ROM_LOAD( "dx00.3d",  0x00000, 0x08000, CRC(f01ef985) SHA1(d5b823bd7c0efcf3137f8643c5d99a260bed5675) )
@@ -3410,7 +3411,8 @@ ROM_START( srdarwin )
 	ROM_LOAD( "dy04.d7", 0x8000, 0x8000, CRC(2ae3591c) SHA1(f21b06d84e2c3d3895be0812024641fd006e45cf) )
 
 	ROM_REGION( 0x1000, "mcu", 0 )    /* ID8751H MCU */
-	ROM_LOAD( "id8751h.mcu", 0x0000, 0x1000, NO_DUMP )
+	// 0160: B4 6B 0D : cjne  a,#$6B,$0170   (ID code 0x6b = World version)
+	ROM_LOAD( "id8751h.mcu", 0x0000, 0x1000, CRC(11cd6ca4) SHA1(ec70f84228e37f9fc1bda85fa52a009f61c500b2) )
 
 	ROM_REGION( 0x08000, "gfx1", 0 )    /* characters */
 	ROM_LOAD( "dy05.b6", 0x00000, 0x4000, CRC(8780e8a3) SHA1(03ea91fdc5aba8e139201604fb3bf9b69f71f056) )