diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/BoardView.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/BoardView.java
index 7528b7907..521bdccc6 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/BoardView.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/BoardView.java
@@ -490,10 +490,38 @@ public class BoardView extends View implements DrawCtx, BoardHandler,
         arrow.draw( m_canvas );
     }
 
-    public boolean vertScrollBoard( Rect /*out*/ rect, int dist, int dfs )
+    public boolean vertScrollBoard( Rect /*in/out*/ rect, int dist, int dfs )
     {
-        Utils.logf( "vertScrollBoard" );
-        return false;
+        boolean doScroll = true; // set to false to disable and let
+                                 // common code scroll by redrawing.
+        if ( doScroll ) {
+            // negative dist means scrolling up
+            boolean down = dist < 0;
+            if ( down ) {
+                dist = -dist;
+            }
+            Rect src = new Rect( rect );
+            src.bottom -= dist;
+            Rect dest = new Rect( src );
+
+            if ( down ) {
+                dest.offset( 0, dist );
+            } else {
+                src.offset( 0, dist);
+            }
+
+            // drawBitmap doesn't work if src and dest *bitmaps* are the
+            // same and rects overlap.  So create (immutable) bitmap to
+            // serve as source.
+            m_canvas.drawBitmap( Bitmap.createBitmap( m_bitmap ),
+                                 src, dest, m_drawPaint );
+
+            if ( !down ) {
+                rect.top = rect.bottom - dist;
+            }
+            rect.bottom = rect.top + dist;
+        }
+        return doScroll;
     }
 
     public boolean trayBegin ( Rect rect, int owner, int dfs )