diff --git a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/README.txt b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/README.txt
index 3867bc20..8a75aefd 100644
--- a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/README.txt	
+++ b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/README.txt	
@@ -1,4 +1,11 @@
-WIP Missing "Turbo Cheap Squeak" Board
+Demolition Derby MiST port
+
+- support for 3/4 players
+- DDERBY.ROM is needed on the SD Card. Can be created from MAME ROM filewith:
+
+# cat demo_drby_pro_0 demo_drby_pro_1 demo_drby_pro_2 demo_drby_pro_3 tcs_u5.bin tcs_u4.bin \
+demo_derby_fg0_a4.a4 demo_derby_fg4_a3.a3 demo_derby_fg1_a6.a6 demo_derby_fg5_a5.a5 \
+demo_derby_fg2_a8.a8 demo_derby_fg6_a7.a7 demo_derby_fg3_a10.a10 demo_derby_fg7_a9.a9 > DDERBY.ROM
 
 
 ---------------------------------------------------------------------------------
diff --git a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDERBY.ROM b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDERBY.ROM
similarity index 61%
rename from Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDERBY.ROM
rename to Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDERBY.ROM
index 940c234a..2b96ac0f 100644
Binary files a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDERBY.ROM and b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDERBY.ROM differ
diff --git a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDerby.rbf b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDerby.rbf
new file mode 100644
index 00000000..1ab08213
Binary files /dev/null and b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Release/DDerby.rbf differ
diff --git a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDerby.rbf b/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDerby.rbf
deleted file mode 100644
index cbadd1a7..00000000
Binary files a/Arcade_MiST/Midway MCR 3/Demolition Derby_MiST/Snapshot/DDerby.rbf and /dev/null differ