diff --git a/yc.txt b/yc.txt
index c88812e..825c606 100644
--- a/yc.txt
+++ b/yc.txt
@@ -290,4 +290,11 @@ A.SEGASYS1+2_60.1=98394396200
 JTALIENS_59.2=81994830210
 KICKANDRUN_59.2=54663220000
 A.TAITO SYSTEM SJ_59.2=81994830148
-JTSIMSON_59.2=81994830210
+JTSIMSON_59.2=81993830210
+JTTMNT_59.2=81993474800
+MEGADRIVE_59.9=36650387593
+MEGADRIVE_59.8i=36650387593
+MEGADRIVE_60.0i=36650387593
+MEGADRIVE_49.7=45812984490
+MEGADRIVE_49.6i=45812984490
+MEGADRIVE_49.8i=45812984490
\ No newline at end of file