diff --git a/BIN/DU.S.txt b/BIN/DU.S.txt
index e8abb29d..855d07a0 100644
--- a/BIN/DU.S.txt
+++ b/BIN/DU.S.txt
@@ -1,8 +1,5 @@
 NEW
   AUTO 3,1
-*---------------------------------------
-* DU: Disk Usage - Bobbi - June 15, 2021
-*---------------------------------------
                          .LIST OFF
                          .OP 65C02
                          .OR $2000
@@ -30,6 +27,7 @@ hLineBuf                 .BS 1
 ZPLineBuf                .BS 2
 bPass2                   .BS 1
 bDirLevel                .BS 1
+bIsTTY                   .BS 1
 ZS.END
                          .ED
 *--------------------------------------
@@ -74,7 +72,9 @@ CS.INIT                  clc
                          rts
 *--------------------------------------
 CS.RUN              
-.1                       stz bDirLevel
+.1                       stz bIsTTY
+                         jsr CS.RUN.ISATTY
+                         stz bDirLevel
                          >INC.G ArgCount
                          >SYSCALL ArgV
                          bcs .6
@@ -391,10 +391,24 @@ CS.RUN.PrintCwd          >PUSHW L.MSG.CWD
 *--------------------------------------
 CS.RUN.NewLine           lda #C.CR
                          >SYSCALL PutChar
+                         lda bIsTTY
+                         beq .9
                          lda #C.LF
                          >SYSCALL PutChar
-                         clc
-                         rts
+.9                       rts
+*--------------------------------------
+CS.RUN.ISATTY           ldy #S.PS.hStdOut
+                        lda (pPS),y
+                        tax
+                        lsr
+                        bcc .9
+                        lda Nod.Table.hFD-2,x
+                        >SYSCALL GetMemPtr
+                        >STYA ZPPtr1
+                        lda (ZPPtr1)
+                        beq .9
+                        inc bIsTTY
+.9                      rts
 *--------------------------------------
 CS.DOEVENT               sec
                          rts