Fix TRAP restore PC, but better

core/cpu.c

@@ -1637,6 +1637,7 @@ static void cpuSUBF_S(VB *sim) {
 /* TRAP */
 static void cpuTRAP(VB *sim) {
     sim->cpu.clocks += cpuClocks(15);
+    sim->cpu.pc     += 2;
     cpuThrow(sim, 0xFFA0 + cpuGetImm5U(sim));
 }
 

core/timer.c

@@ -117,7 +117,7 @@ static void tmrWriteControl(VB *sim, uint8_t value) {
     if (
         !sim->tmr.t_clk_sel &&
         (value & 0x10)      && /* T-Clk-Sel */
-        sim->tmr.tick20 != 4
+        sim->tmr.tick20 != 0
     ) {
         tmrUpdate(sim, sim->tmr.counter == 0 ?
             sim->tmr.reload : sim->tmr.counter - 1);

web/Core.js

@@ -87,10 +87,7 @@ new class Core {
             this.sims.set(sim.pointer, sim);
 
             // Video
-            sim.pixels = this.#noalloc(
+            sim.pixels = this.#getPixels(sim);
-                this.GetExtPixels(sim.pointer),
-                384*224*4, sim, "pixels", Uint8ClampedArray
-            );
             sim.image  = new ImageData(sim.pixels, 384, 224);
 
             // Audio
@@ -364,9 +361,11 @@ new class Core {
             this.mallocs.set(buffer.pointer, buffer);
             this.#updateTarget(buffer);
         }
-        for (let sim of this.sims)
+        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(