diff --git a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.Render.cs b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.Render.cs
index 88982c7c1c..b84c4f8edd 100644
--- a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.Render.cs
+++ b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.Render.cs
@@ -196,7 +196,7 @@
 				
 				_sprOwner = -1;
 				_sprSense = false;
-				for (_sprIndex = 0; _sprIndex < 8; _sprIndex++)
+				for (_sprIndex = 7; _sprIndex >= 0; _sprIndex--)
 				{
 					_spr = _sprites[_sprIndex];
 					_sprData = 0;
@@ -246,34 +246,35 @@
 							// sprite-sprite collision
 							if (_sprSense)
 							{
+								// "One any collision bit within a register is set high, subsequent
+								// collisions will not set the interrupt latch until that collision register
+								// has been cleared to all "0"s by a read."
+								_intSpriteCollision |= !_intSpriteCollisionTriggered;
 								_spr.CollideSprite = true;
 								_sprites[_sprOwner].CollideSprite = true;
-								_intSpriteCollision = true;
 							}
-							else
+
+							_sprSense = true;
+							_sprOwner = _sprIndex;
+							_sprPriority = _spr.Priority;
+							switch (_sprData)
 							{
-								_sprSense = true;
-								_sprOwner = _sprIndex;
-								_sprPriority = _spr.Priority;
-								switch (_sprData)
-								{
-									case SrSpriteMask1:
-										_sprDecode = ColorRegisterSelect.SpriteMc0;
-										break;
-									case SrSpriteMask2:
-										_sprDecode = ColorRegisterSelect.Sprite0 + _sprOwner;
-										break;
-									case SrSpriteMask3:
-										_sprDecode = ColorRegisterSelect.SpriteMc1;
-										break;
-								}
+								case SrSpriteMask1:
+									_sprDecode = ColorRegisterSelect.SpriteMc0;
+									break;
+								case SrSpriteMask2:
+									_sprDecode = ColorRegisterSelect.Sprite0 + _sprOwner;
+									break;
+								case SrSpriteMask3:
+									_sprDecode = ColorRegisterSelect.SpriteMc1;
+									break;
 							}
 
 							// sprite-data collision
 							if (_gfxSense)
 							{
 								_spr.CollideData = true;
-								_intSpriteDataCollision = true;
+								_intSpriteDataCollision = !_intSpriteDataCollisionTriggered;
 							}
 						}
 					}
diff --git a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.State.cs b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.State.cs
index d56e742769..420ce16d92 100644
--- a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.State.cs
+++ b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.State.cs
@@ -39,7 +39,9 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
 		private bool _intLightPen;
 		private bool _intRaster;
 		private bool _intSpriteCollision;
+		private bool _intSpriteCollisionTriggered;
 		private bool _intSpriteDataCollision;
+		private bool _intSpriteDataCollisionTriggered;
 		private int _lightPenX;
 		private int _lightPenY;
 		private bool _multicolorMode;
@@ -112,7 +114,9 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
 			_intLightPen = false;
 			_intRaster = false;
 			_intSpriteCollision = false;
+			_intSpriteCollisionTriggered = false;
 			_intSpriteDataCollision = false;
+			_intSpriteDataCollisionTriggered = false;
 			_irqBuffer = 0;
 			_lightPenX = 0;
 			_lightPenY = 0;
@@ -189,7 +193,9 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
 			ser.Sync(nameof(_intLightPen), ref _intLightPen);
 			ser.Sync(nameof(_intRaster), ref _intRaster);
 			ser.Sync(nameof(_intSpriteCollision), ref _intSpriteCollision);
+			ser.Sync(nameof(_intSpriteCollisionTriggered), ref _intSpriteCollision);
 			ser.Sync(nameof(_intSpriteDataCollision), ref _intSpriteDataCollision);
+			ser.Sync(nameof(_intSpriteDataCollisionTriggered), ref _intSpriteDataCollision);
 			ser.Sync(nameof(_irqBuffer), ref _irqBuffer);
 			ser.Sync(nameof(_lightPenX), ref _lightPenX);
 			ser.Sync(nameof(_lightPenY), ref _lightPenY);
diff --git a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.cs b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.cs
index 01acdb852c..d71d0ae28d 100644
--- a/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.cs
+++ b/BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.cs
@@ -233,16 +233,16 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
 					spr.CollideData = false;
 				}
 				_spriteBackgroundCollisionClearPending = false;
+				_intSpriteDataCollisionTriggered = false;
 			}
 
 			// sprite collision clear
 			if (_spriteSpriteCollisionClearPending)
 			{
 				foreach (var spr in _sprites)
-				{
 					spr.CollideSprite = false;
-				}
 				_spriteSpriteCollisionClearPending = false;
+				_intSpriteCollisionTriggered = false;
 			}
 
 			// raster IRQ is edge triggered