All instructions done

src/chip8Emulator.ts

@@ -3,16 +3,14 @@ import Keyboard from './keyboard'
 import RNG from './RNG'
 
 class Chip8Emulator {
-	
 	cpu: CPU;
 	keyboard: Keyboard;
-
 	rom: Uint8Array;
 
 	constructor() {
-		
-		this.cpu = new CPU();
 		this.keyboard = new Keyboard();
+		this.cpu = new CPU(this.keyboard);
+		
 		this.rom = new Uint8Array();
 	}
 

src/cpu.ts

@@ -1,4 +1,5 @@
 import RNG from './RNG'
+import Keyboard from './keyboard';
 
 const SCREEN_WIDTH = 64;
 const SCREEN_HEIGHT = 32;
@@ -22,9 +23,12 @@ class CPU {
 	memory: Uint8Array;
 	displayMemory: Uint8Array;
 	
+	keyboard: Keyboard;
+
 	rng: RNG;
 	
-	constructor() {
+
+	constructor(keyboard: Keyboard) {
 		this.memory = new Uint8Array(MEMORY_SIZE);
 		this.displayMemory = new Uint8Array(SCREEN_WIDTH*SCREEN_HEIGHT);
 		this.pc = 0x200;
@@ -34,6 +38,7 @@ class CPU {
 		this.delayTimer = 0;
 		this.soundTimer = 0;
 		this.regs = new Uint8Array(REGISTERS);
+		this.keyboard = keyboard;
 		
 		this.rng = new RNG(0);
 
@@ -268,29 +273,128 @@ class CPU {
 			case 0xD: {
 				// DXYN
 				// draw(Vx, Vy, N)
-				this.regs[0xF] = 0;
+				this.regs[0xF] = 0; // Reset register VF
 
 				let regX = this.regs[nib2];
 				let regY = this.regs[nib3];
 				
-				let y = 0;
-				while(y < nib4) {
+				for(let y = 0; y < nib4; y++) {
 					// A sprite is always 8 bits horizontal
-					let pixel = this.memory[this.indexReg + y];
-					let x = 0;
-					while(x < 8) {
-						const msb = 0x80;
+					let pixel = this.memory[this.indexReg + y]; // Fetch pixel from memory starting at I reg
 					
+					for(let x = 0; x < 8; x++) {
+						const MSB = 0x80; // 0b10000000
 						
-						x++;
+						if((pixel & (MSB >> x)) != 0) {
+							let mem = x + regX + ((y + regY) * SCREEN_WIDTH);
+							if(this.displayMemory[mem] == 1) {
+								this.regs[0xF] = 1;
+							}
+							this.displayMemory[mem] ^= 1;
+						}
 					}
-
-					y++;
 				}
 
 				this.incrementPC();
 				}
 				break;
+			case 0xE: {
+				if(secondOpcode == 0x9E) {
+					// EX9E
+					// if (key() == Vx)
+					// Skips the next instruction if the key stored at VX is pressed
+					if(this.keyboard.keys[this.regs[nib2]] == 1) {
+						this.incrementPC();
+					}
+				}else if(secondOpcode == 0xA1) {
+					// EXA1
+					// if (key() != Vx)
+					// Skips the next instruction if the key stored at VX is NOT pressed
+					if(this.keyboard.keys[this.regs[nib2]] != 1) {
+						this.incrementPC();
+					}
+				}
+				this.incrementPC();
+				}
+				break;
+			case 0xF: {
+				if(secondOpcode == 0x07) {
+					// FX07
+					// Vx = delayTimer
+					this.regs[nib2] = this.delayTimer;
+					this.incrementPC();
+				}else if(secondOpcode == 0x0A) {
+					// FX0A
+					// A key pressed is awaited and then stored at VX. 
+					// [BLOCKING OPERATION], all instructions are halted until next key event
+					// Vx = get_key()
+					let keyPressed = false;
+
+					for(let i = 0; i < this.keyboard.keys.length; i++) {
+						if(this.keyboard.keys[i] != 0) {
+							keyPressed = true;
+							this.regs[nib2] = i;
+							break;
+						}
+					}
+
+					if(!keyPressed)
+						return; // NOT INCREMENT PC SO WE ARE STUCK IN THIS WAITING
+
+					this.incrementPC();
+				}else if(secondOpcode == 0x15) {
+					// FX15
+					// delayTimer = Vx
+					this.delayTimer = this.regs[nib2];
+					this.incrementPC();
+				}else if(secondOpcode == 0x18) {
+					// FX18
+					// soundTimer = Vx
+					this.soundTimer = this.regs[nib2];
+					this.incrementPC();
+				}else if(secondOpcode == 0x1E) {
+					// FX1E
+					// I += Vx
+					// Adds VX to I. VF is not affected
+					this.indexReg += this.regs[nib2];
+					this.incrementPC();
+				}else if(secondOpcode == 0x29) {
+					// FX29
+					// I = sprite_addr[Vx]
+					// Sets I to the location of the sprite for the character in VX
+					this.indexReg = this.regs[nib2] * 0x5; // ??
+					this.incrementPC();
+				}else if(secondOpcode == 0x33) {
+					// FX33
+					// set_BCD(Vx)
+					// *(I+0) = BCD(3);
+					// *(I+1) = BCD(2);
+					// *(I+2) = BCD(1);
+					// Stores the binary-coded decimal representation of Vx, with the hundreds digit memory at location in I,
+					// 
+					this.memory[this.indexReg] = this.regs[nib2] / 100;
+					this.memory[this.indexReg + 1] = (this.regs[nib2] / 10) % 10;
+					this.memory[this.indexReg + 2] = this.regs[nib2] % 10;
+					this.incrementPC();
+				}else if(secondOpcode == 0x55) {
+					// FX55
+					// reg_dump(Vx, &I)
+					// Stores from V0 to VX in memory starting at address I.
+					for(let i = 0; i < nib2; i++) {
+						this.memory[this.indexReg + i] = this.regs[i];
+					}
+					this.incrementPC();
+				}else if(secondOpcode == 0x65) {
+					// FX65
+					// reg_load(Vx, &I)
+					// Fills fomr V0 to VX with values from memory staring at address I.
+					for(let i = 0; i < nib2; i++) {
+						this.regs[i] = this.memory[this.indexReg + i];
+					}
+					this.incrementPC();
+				}
+				}
+				break;
 		}
 	}