diff --git a/src/system/itsdev.974 b/src/system/itsdev.975
similarity index 99%
rename from src/system/itsdev.974
rename to src/system/itsdev.975
index 04615974..5cf5e701 100755
--- a/src/system/itsdev.974
+++ b/src/system/itsdev.975
@@ -2146,6 +2146,7 @@ UPTPGT:	BLOCK 8	;SAVE MAP
 POTCON:	-1	;<NUMBER OF POTS CONNECTED>-1
 
 PTNOIS:	3	;IGNORE ANY CHANGE < OR = THIS AS POT NOISE
+BBLK
 ]
 
 SUBTTL	340 DISPLAY
@@ -2154,6 +2155,7 @@ IFN 340P,[
 ;
 ; DISPLAY INTERRUPT ROUTINE
 ;
+EBLK
 DRECYC:	0
 ;
 BBLK