diff --git a/src/mame/drivers/cdi.cpp b/src/mame/drivers/cdi.cpp
index aadc3752fad..0cdcea594ee 100644
--- a/src/mame/drivers/cdi.cpp
+++ b/src/mame/drivers/cdi.cpp
@@ -1084,7 +1084,7 @@ ROM_START( quizard ) /* CD-ROM printed ??/?? */
 	DISK_IMAGE_READONLY( "quizard18", 0, BAD_DUMP SHA1(ede873b22957f2a707bbd3039e962ef2ca5aedbd) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) )
+	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) ) // confirmed good on original hardware
 ROM_END
 
 
@@ -1102,7 +1102,7 @@ ROM_START( quizard_17 )
 	DISK_IMAGE_READONLY( "quizard17", 0, BAD_DUMP SHA1(4bd698f076505b4e17be978481bce027eb47123b) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) )
+	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) ) // confirmed good on original hardware
 ROM_END
 
 ROM_START( quizard_12 ) /* CD-ROM printed 01/95 */
@@ -1119,7 +1119,7 @@ ROM_START( quizard_12 ) /* CD-ROM printed 01/95 */
 	DISK_IMAGE_READONLY( "quizard12", 0, BAD_DUMP SHA1(6e41683b96b74e903040842aeb18437ad7813c82) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) )
+	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) ) // confirmed good on original hardware
 ROM_END
 
 ROM_START( quizard_10 )
@@ -1139,7 +1139,7 @@ ROM_START( quizard_10 )
 	DISK_IMAGE_READONLY( "quizard10", 0, SHA1(5715db50f0d5ffe06f47c0943f4bf0481ab6048e) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) )
+	ROM_LOAD( "quizard1_german_d8751.bin", 0x0000, 0x1000, CRC(95f45b6b) SHA1(51b34956539b1e2cf0306f243a970750f1e18d01) ) // confirmed good on original hardware
 ROM_END
 
 
@@ -1230,7 +1230,7 @@ ROM_START( quizard4 ) /* CD-ROM printed 09/98 */
 	DISK_IMAGE_READONLY( "quizard4r42", 0, BAD_DUMP SHA1(a5d5c8950b4650b8753f9119dc7f1ccaa2aa5442) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) )
+	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) ) // confirmed good on original hardware
 ROM_END
 
 ROM_START( quizard4_41 )
@@ -1247,7 +1247,7 @@ ROM_START( quizard4_41 )
 	DISK_IMAGE_READONLY( "quizard4r41", 0, BAD_DUMP SHA1(2c0484c6545aac8e00b318328c6edce6f5dde43d) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) )
+	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) ) // confirmed good on original hardware
 ROM_END
 
 ROM_START( quizard4_40 ) /* CD-ROM printed 07/97 */
@@ -1264,7 +1264,7 @@ ROM_START( quizard4_40 ) /* CD-ROM printed 07/97 */
 	DISK_IMAGE_READONLY( "quizard4r40", 0, BAD_DUMP SHA1(288cc37a994e4f1cbd47aa8c92342879c6fc0b87) )
 
 	ROM_REGION(0x1000, "mcu", 0)
-	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) )
+	ROM_LOAD( "quizard4_german_d8751.bin", 0x0000, 0x1000, CRC(77be0b40) SHA1(113b5c239480a2259f55e411ba8fb3972e6d4301) ) // confirmed good on original hardware
 ROM_END