diff --git a/src/mame/pc/pc.cpp b/src/mame/pc/pc.cpp
index f94e729c06d..a762e971746 100644
--- a/src/mame/pc/pc.cpp
+++ b/src/mame/pc/pc.cpp
@@ -651,8 +651,8 @@ ROM_END
 
 ROM_START( mc1702 )
 	ROM_REGION16_LE(0x10000,"bios", 0)
-	ROM_LOAD16_BYTE("2764_2,573rf4.rom", 0xc000,  0x2000, CRC(34a0c8fb) SHA1(88dc247f2e417c2848a2fd3e9b52258ad22a2c07))
-	ROM_LOAD16_BYTE("2764_3,573rf4.rom", 0xc001, 0x2000, CRC(68ab212b) SHA1(f3313f77392877d28ce290ffa3432f0a32fc4619))
+	ROM_LOAD16_BYTE("2764_2,573rf4.rom", 0xc000,  0x2000, BAD_DUMP CRC(34a0c8fb) SHA1(88dc247f2e417c2848a2fd3e9b52258ad22a2c07))
+	ROM_LOAD16_BYTE("2764_3,573rf4.rom", 0xc001, 0x2000, BAD_DUMP CRC(68ab212b) SHA1(f3313f77392877d28ce290ffa3432f0a32fc4619))
 	ROM_LOAD("ba1m,573rf5.rom", 0x0000, 0x0800, CRC(08d938e8) SHA1(957b6c691dbef75c1c735e8e4e81669d056971e4))
 ROM_END