diff --git a/src/cpu.ts b/src/cpu.ts
index bfb9ffd..e7f4872 100644
--- a/src/cpu.ts
+++ b/src/cpu.ts
@@ -327,11 +327,15 @@ class CPU {
 			case 0xD: {
 				// DXYN
 				// draw(Vx, Vy, N)
+				// Draws a sprite at coordinate (VX, VY) that has a width of 8 pixels and a height of N pixels
 				this.regs[0xF] = 0; // Reset register VF
 
 				let regX = this.regs[nib2];
 				let regY = this.regs[nib3];
 				
+				regX = regX % 64;
+				regY = regY % 32;
+				
 				for(let y = 0; y < nib4; y++) {
 					// A sprite is always 8 bits horizontal
 					let pixel = this.memory[this.indexReg + y]; // Fetch pixel from memory starting at I reg
@@ -340,7 +344,14 @@ class CPU {
 						const MSB = 0x80; // 0b10000000
 						
 						if((pixel & (MSB >> x)) != 0) {
-							let mem = x + regX + ((y + regY) * SCREEN_WIDTH);
+							let r = x + regX;
+							let c = ((y + regY) * SCREEN_WIDTH);
+							let mem = r + c;
+							
+							if(r+c > 64*32) {
+								mem = mem % (64*32);
+							}
+							
 							if(this.displayMemory[mem] == 1) {
 								this.regs[0xF] = 1;
 							}