diff --git a/web/Core.js b/web/Core.js
index bd1b13b..92b75b9 100644
--- a/web/Core.js
+++ b/web/Core.js
@@ -87,11 +87,8 @@ new class Core {
             this.sims.set(sim.pointer, sim);
 
             // Video
-            sim.pixels = this.#noalloc(
-                this.GetExtPixels(sim.pointer),
-                384*224*4, sim, "pixels", Uint8ClampedArray
-            );
-            sim.image = new ImageData(sim.pixels, 384, 224);
+            sim.pixels = this.#getPixels(sim);
+            sim.image  = new ImageData(sim.pixels, 384, 224);
 
             // Audio
             sim.samples = this.#noalloc(
@@ -364,8 +361,10 @@ new class Core {
             this.mallocs.set(buffer.pointer, buffer);
             this.#updateTarget(buffer);
         }
-        for (let sim of this.sims)
-            sim.image = new ImageData(sim.pixels, 384, 224);
+        for (let sim of this.sims.values()) {
+            sim.pixels = this.#getPixels(sim);
+            sim.image  = new ImageData(sim.pixels, 384, 224);
+        }
     }
 
 
@@ -436,6 +435,14 @@ new class Core {
         this.Realloc(buffer.pointer, 0);
     }
 
+    // Register a sim's pixel buffer
+    #getPixels(sim) {
+        return this.#noalloc(
+            this.GetExtPixels(sim.pointer),
+            384*224*4, sim, "pixels", Uint8ClampedArray
+        );
+    }
+
     // Allocate memory in WebAssembly and register the buffer
     #malloc(count, target = null, assign = null, type = Uint8ClampedArray) {
         return this.#noalloc(