diff --git a/src/mame/drivers/alien.c b/src/mame/drivers/alien.c
index 4d7601134bd..1e764b9e371 100644
--- a/src/mame/drivers/alien.c
+++ b/src/mame/drivers/alien.c
@@ -97,11 +97,14 @@ ROM_START( alien )
 	ROM_LOAD32_WORD( "aln_s04.4.ic30", 0x000000, 0x400000, CRC(11777d3f) SHA1(8cc9fcae7911e6be273b4532d89b44a309687ead) )
     ROM_LOAD32_WORD( "aln_s05.5.ic33", 0x000002, 0x400000, CRC(71d2f22c) SHA1(16b25aa34f8b0d988565e7ab7cecc4df62ee8cf3) )
 
-	ROM_REGION( 0x800100, "unk", 0 ) //firmware?
+	ROM_REGION( 0x800100, "unk", 0 ) //flash firmware?
 	ROM_LOAD( "s29jl064hxxtfi00.u35", 0x000000, 0x800100, CRC(01890c61) SHA1(4fad321f42eab835351c6d5f73539bdbed80affe) )
 
 	ROM_REGION( 0x8000, "nvram", ROMREGION_ERASEFF) //timekeeper device
 	ROM_LOAD( "m48t35y.3.ic26", 0x000000, 0x007ff8, CRC(060b0a75) SHA1(7ddf380ee0e7b54533ef7e248405bfce1c5dbb4b) )
+
+	DISK_REGION( "card" ) //compact flash
+	DISK_IMAGE( "alien", 0, NO_DUMP)
 ROM_END