diff --git a/src/system/itsdev.975 b/src/system/itsdev.976
similarity index 99%
rename from src/system/itsdev.975
rename to src/system/itsdev.976
index 1ad60326..23cf122a 100755
--- a/src/system/itsdev.975
+++ b/src/system/itsdev.976
@@ -5254,7 +5254,7 @@ BBLK
 PDPRST:	PUSHJ P,MP6LD
 	MOVE C,[400020,,400021]
 	XCTR XW,[CLEARM 400020]
-	XCTR XBRW,[BLT C,437777]
+	XCTR XBRW,[BLT C,400000+LPDP6M*2000-1]
 	MOVE C,[PDPCLR,,400020]
 	XCTR XBW,[BLT C,400000+PDPCLE-1]
 	MOVE C,[JRST 20]