diff --git a/src/platform/galaxian.ts b/src/platform/galaxian.ts
index edffb41a..b7010cc3 100644
--- a/src/platform/galaxian.ts
+++ b/src/platform/galaxian.ts
@@ -201,6 +201,8 @@ const _GalaxianPlatform = function(mainElement, options) {
 	];
 
  class GalaxianPlatform extends BaseZ80Platform implements Platform {
+ 
+  scanline : number;
 
   getPresets() {
     return GALAXIAN_PRESETS;
@@ -305,6 +307,7 @@ const _GalaxianPlatform = function(mainElement, options) {
   
   advance(novideo : boolean) {
     for (var sl=0; sl<scanlinesPerFrame; sl++) {
+      this.scanline = sl;
       if (!novideo) {
         drawScanline(pixels, sl);
       }
@@ -322,6 +325,8 @@ const _GalaxianPlatform = function(mainElement, options) {
     // NMI interrupt @ 0x66
     if (interruptEnabled) { cpu.nonMaskableInterrupt(); }
   }
+  
+  getRasterScanline() { return this.scanline; }
 
   loadROM(title, data) {
     rom = padBytes(data, romSize);
diff --git a/src/platform/vicdual.ts b/src/platform/vicdual.ts
index 2ddb6fbc..f76df8a9 100644
--- a/src/platform/vicdual.ts
+++ b/src/platform/vicdual.ts
@@ -98,6 +98,8 @@ const _VicDualPlatform = function(mainElement) {
   ]);
 
  class VicDualPlatform extends BaseZ80Platform implements Platform {
+ 
+   scanline : number = 0;
 
   getPresets() {
     return VICDUAL_PRESETS;
@@ -153,6 +155,7 @@ const _VicDualPlatform = function(mainElement) {
   advance(novideo : boolean) {
     var targetTstates = cpu.getTstates();
     for (var sl=0; sl<scanlinesPerFrame; sl++) {
+      this.scanline = sl;
       inputs[2] &= ~0x8;
       inputs[2] |= ((cpu.getTstates() / cyclesPerTimerTick) & 1) << 3;
       if (!novideo) {
@@ -165,6 +168,10 @@ const _VicDualPlatform = function(mainElement) {
     }
     video.updateFrame();
   }
+  
+  getRasterScanline() {
+    return this.scanline;
+  }
 
   loadROM(title, data) {
     if (data.length >= 0x4020 && (data[0x4000] || data[0x401f])) {
diff --git a/src/platform/williams.ts b/src/platform/williams.ts
index 607996d5..149b4f86 100644
--- a/src/platform/williams.ts
+++ b/src/platform/williams.ts
@@ -308,6 +308,8 @@ var WilliamsPlatform = function(mainElement, proto) {
     pixels = video.getFrameData();
     timer = new AnimationTimer(60, this.nextFrame.bind(this));
   }
+  
+  this.getRasterScanline = function() { return video_counter; }
 
   this.advance = function(novideo:boolean) {
     var cpuCyclesPerSection = Math.round(cpuCyclesPerFrame / 65);