diff --git a/applecorn.po b/applecorn.po
index cad9bc6..516b14f 100644
Binary files a/applecorn.po and b/applecorn.po differ
diff --git a/auxmem.gfx.s b/auxmem.gfx.s
index 62e0726..14f98cd 100644
--- a/auxmem.gfx.s
+++ b/auxmem.gfx.s
@@ -57,9 +57,11 @@ CVTCOORD
             LSR   A
             ROR   ZP2+0
             LSR   A
-            STA   VDUQ+8        ; ZP2 -> Y-coord
-            LDA   ZP2+0
-            ROR
+            ROR   ZP2+0
+            STZ   VDUQ+8        ; MSB always zero
+            SEC
+            LDA   #191          ; 191 - ZP2 -> Y-coord
+            SBC   ZP2+0
             STA   VDUQ+7
             RTS
 
diff --git a/auxmem.vdu.s b/auxmem.vdu.s
index f1a5200..f9baccd 100644
--- a/auxmem.vdu.s
+++ b/auxmem.vdu.s
@@ -585,7 +585,8 @@ VDU16        >>>   XF2MAIN,CLRHGR
 VDU16RET     >>>   ENTAUX
              STZ   XPIXEL+0
              STZ   XPIXEL+1
-             STZ   YPIXEL
+             LDA   #191
+             STA   YPIXEL
              RTS
 
 * VDU 17 - COLOUR n - select text or border colour