diff --git a/classes/example/JavaCubeMemory.java b/classes/example/JavaCubeMemory.java
index 304bd25..97a010b 100644
--- a/classes/example/JavaCubeMemory.java
+++ b/classes/example/JavaCubeMemory.java
@@ -215,6 +215,8 @@ public class JavaCubeMemory {
         int core = 0;
         int ta = 0;
         System.out.println("main");
+        int framebuffer_tiles_width = framebuffer_width / 32;
+        int framebuffer_tiles_height = framebuffer_height / 32;
         while (true) {
             // unpipelined render loop
             TAFIFOPolygonConverter.init(TextureMemoryAllocation.isp_tsp_parameters_start[ta],
@@ -223,8 +225,8 @@ public class JavaCubeMemory {
                                         TextureMemoryAllocation.object_list_end[ta],
                                         opb_size_total,
                                         ta_alloc,
-                                        framebuffer_width / 32,
-                                        framebuffer_height / 32);
+                                        framebuffer_tiles_width,
+                                        framebuffer_tiles_height);
             transfer_cube_scene();
             TAFIFOPolygonConverter.wait_translucent_list();
 
@@ -239,7 +241,7 @@ public class JavaCubeMemory {
             Memory.putU4(Holly.FB_R_SOF1, TextureMemoryAllocation.framebuffer_start[core]);
             while ((CoreBits.spg_status__vsync(Memory.getU4(Holly.SPG_STATUS)) != 0));
 
-            core = (core + 1) % 1;
+            core = (core + 1) & 1;
 
             theta += Math.DEGREES_TO_RADIANS;
         }