diff --git a/rom/extra.s b/rom/extra.s
index 39e5e6a..f370ef4 100644
--- a/rom/extra.s
+++ b/rom/extra.s
@@ -147,14 +147,6 @@ CLOSE:
 
 ; Default
 
-ISCNTC:
-        lda IO_KBD
-        cmp #$03
-        beq :+
-        rts
-:
-        jmp STOP
-
 SYS:
         jsr GTNUM
         lda LINNUM
diff --git a/rom/header.s b/rom/header.s
deleted file mode 100644
index d0ce47c..0000000
--- a/rom/header.s
+++ /dev/null
@@ -1,3 +0,0 @@
-.segment "HEADER"
-
-; Empty
\ No newline at end of file
diff --git a/rom/iscntc.s b/rom/iscntc.s
index abcf530..bbf9585 100644
--- a/rom/iscntc.s
+++ b/rom/iscntc.s
@@ -1 +1,9 @@
-;!!! runs into "STOP"
+.segment "CODE"
+
+ISCNTC:
+        lda IO_KBD
+        cmp #$03
+        beq :+
+        rts
+:
+        jmp STOP
\ No newline at end of file
diff --git a/rom/msbasic.s b/rom/msbasic.s
index 133ccae..bd50499 100644
--- a/rom/msbasic.s
+++ b/rom/msbasic.s
@@ -6,7 +6,6 @@
 .include "defines.s"
 .include "macros.s"
 .include "zeropage.s"
-.include "header.s"
 .include "token.s"
 .include "error.s"
 .include "message.s"