1 files changed, 26 insertions, 23 deletions

diff --git a/nes.js b/nes.js
index c606368..5ef45bd 100644
--- a/nes.js
+++ b/nes.js
@@ -66,54 +66,57 @@ function NES() {
         this.ppu.startFrame();
         var cycles = 0;
         var emulateSound = Globals.emulateSound;
+        var cpu = this.cpu;
+        var ppu = this.ppu;
+        var papu = this.papu;
         FRAMELOOP: for (;;) {
-            if (this.cpu.cyclesToHalt == 0) {
+            if (cpu.cyclesToHalt == 0) {
                 // Execute a CPU instruction
-                cycles = this.cpu.emulate();
-                if(emulateSound) {
-    				this.papu.clockFrameCounter(cycles);
+                cycles = cpu.emulate();
+                if (emulateSound) {
+    				papu.clockFrameCounter(cycles);
     			}
                 cycles *= 3;
             }
             else {
-                if (this.cpu.cyclesToHalt > 8) {
+                if (cpu.cyclesToHalt > 8) {
                     cycles = 24;
                     if (emulateSound) {
-                        this.papu.clockFrameCounter(8);
+                        papu.clockFrameCounter(8);
                     }
-                    this.cpu.cyclesToHalt -= 8;
+                    cpu.cyclesToHalt -= 8;
                 }
                 else {
-                    cycles = this.cpu.cyclesToHalt * 3;
+                    cycles = cpu.cyclesToHalt * 3;
                     if (emulateSound) {
-                        this.papu.clockFrameCounter(this.cpu.cyclesToHalt);
+                        papu.clockFrameCounter(cpu.cyclesToHalt);
                     }
-                    this.cpu.cyclesToHalt = 0;
+                    cpu.cyclesToHalt = 0;
                 }
             }
             
             for(;cycles>0;cycles--){
 
-                if(this.ppu.curX == this.ppu.spr0HitX 
-                        && this.ppu.f_spVisibility==1 
-                        && this.ppu.scanline-21 == this.ppu.spr0HitY){
+                if(ppu.curX == ppu.spr0HitX 
+                        && ppu.f_spVisibility==1 
+                        && ppu.scanline-21 == ppu.spr0HitY){
                     // Set sprite 0 hit flag:
-                    this.ppu.setStatusFlag(this.ppu.STATUS_SPRITE0HIT,true);
+                    ppu.setStatusFlag(ppu.STATUS_SPRITE0HIT,true);
                 }
 
-                if(this.ppu.requestEndFrame){
-                    this.ppu.nmiCounter--;
-                    if(this.ppu.nmiCounter == 0){
-                        this.ppu.requestEndFrame = false;
-                        this.ppu.startVBlank();
+                if(ppu.requestEndFrame){
+                    ppu.nmiCounter--;
+                    if(ppu.nmiCounter == 0){
+                        ppu.requestEndFrame = false;
+                        ppu.startVBlank();
                         break FRAMELOOP;
                     }
                 }
 
-                this.ppu.curX++;
-                if(this.ppu.curX==341){
-                    this.ppu.curX = 0;
-                    this.ppu.endScanline();
+                ppu.curX++;
+                if(ppu.curX==341){
+                    ppu.curX = 0;
+                    ppu.endScanline();
                 }
 
             }