diff --git a/libsrc/sym1/bitio.s b/libsrc/sym1/bitio.s
index 94cd9c5ad..a61dd4800 100644
--- a/libsrc/sym1/bitio.s
+++ b/libsrc/sym1/bitio.s
@@ -48,7 +48,7 @@
 .proc _get_DDR1A: near
 
         lda     DDR1A            ;  Read data direction register for port 1A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR1A
 
 .endproc
@@ -63,7 +63,7 @@
 .proc _get_IOR1A: near
 
         lda     OR1A             ;  Read I/O register for port 1A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR1A
 
 .endproc
@@ -78,7 +78,7 @@
 .proc _get_DDR1B: near
 
         lda     DDR1B            ;  Read data direction register for port 1B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR1B
 
 .endproc
@@ -93,7 +93,7 @@
 .proc _get_IOR1B: near
 
         lda     OR1B             ;  Read I/O register for port 1B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR1B
 
 .endproc
@@ -108,7 +108,7 @@
 .proc _get_DDR2A: near
 
         lda     DDR2A            ;  Read data direction register for port 2A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR2A
 
 .endproc
@@ -123,7 +123,7 @@
 .proc _get_IOR2A: near
 
         lda     OR2A             ;  Read I/O register for port 2A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR2A
 
 .endproc
@@ -138,7 +138,7 @@
 .proc _get_DDR2B: near
 
         lda     DDR2B            ;  Read data direction register for port 2B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR2B
 
 .endproc
@@ -153,7 +153,7 @@
 .proc _get_IOR2B: near
 
         lda     OR2B             ;  Read I/O register for port 2B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR2B
 
 .endproc
@@ -168,7 +168,7 @@
 .proc _get_DDR3A: near
 
         lda     DDR3A            ;  Read data direction register for port 3A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR3A
 
 .endproc
@@ -183,7 +183,7 @@
 .proc _get_IOR3A: near
 
         lda     OR3A             ;  Read I/O register for port 3A
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR3A
 
 .endproc
@@ -198,7 +198,7 @@
 .proc _get_DDR3B: near
 
         lda     DDR3B            ;  Read data direction register for port 3B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DDR3B
 
 .endproc
@@ -213,7 +213,7 @@
 .proc _get_IOR3B: near
 
         lda     OR3B             ;  Read I/O register for port 3B
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return OR3B
 
 .endproc
diff --git a/libsrc/sym1/display.s b/libsrc/sym1/display.s
index a8572f1b0..9bef30c01 100644
--- a/libsrc/sym1/display.s
+++ b/libsrc/sym1/display.s
@@ -44,7 +44,7 @@
 .proc _get_D0:  near
 
         lda     DISBUF0          ;  Read Digit 0
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF0
 
 .endproc
@@ -59,7 +59,7 @@
 .proc _get_D1:  near
 
         lda     DISBUF1          ;  Read Digit 1
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts
 
 .endproc
@@ -74,7 +74,7 @@
 .proc _get_D2:  near
 
         lda     DISBUF2          ;  Read Digit 2
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF2
 
 .endproc
@@ -89,7 +89,7 @@
 .proc _get_D3:  near
 
         lda     DISBUF3          ;  Read Digit 3
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF3
 
 .endproc
@@ -104,7 +104,7 @@
 .proc _get_D4:  near
 
         lda     DISBUF4          ;  Read Digit 4
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF4
 
 .endproc
@@ -119,7 +119,7 @@
 .proc _get_D5:  near
 
         lda     DISBUF5          ;  Read Digit 5
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF5
 
 .endproc
@@ -134,7 +134,7 @@
 .proc _get_D6:  near
 
         lda     DISBUF6          ;  Read byte to the right of display
-        ldx     #$00             ;
+        ldx     #>$0000          ;
         rts                      ;  Return DISBUF6
 
 .endproc
diff --git a/libsrc/sym1/tapeio.s b/libsrc/sym1/tapeio.s
index 85c9c6fcc..e956b6eee 100644
--- a/libsrc/sym1/tapeio.s
+++ b/libsrc/sym1/tapeio.s
@@ -24,7 +24,7 @@
         lda     #$00
         ldx     #$00             ; Return 0000 if successful
         jmp     done
-error:  ldx     #$00
+error:  ldx     #>$0000
         lda     #$FF             ; or 00FF if not
 done:   rts
 
@@ -47,7 +47,7 @@ done:   rts
         lda     #$00
         ldx     #$00             ; Return 0000 if successful
         jmp     done
-error:  ldx     #$00
+error:  ldx     #>$0000
         lda     #$FF             ; or 00FF if not
 done:   rts