MichaelValwin/Chipvuelto8
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Fix some comments. Some instructions are still failing

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This commit is contained in:
Miguel Angel 2024-09-06 13:20:10 +02:00
parent 6535ef4dc3
commit a1cedd91ef
1 changed files with 12 additions and 14 deletions
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24
src/cpu.ts
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@ -11,15 +11,15 @@ const STACK_SIZE = 16;
const REGISTERS = 16;
class CPU {
pc: number; // 16b
indexReg: number; // 16b
pc: number; // 16b
indexReg: number; // 16b
regs: Uint8Array;
delayTimer: number; // 8b
soundTimer: number; // 8b
delayTimer: number; // 8b
soundTimer: number; // 8b
stackPointer: number; // 16b
stack: Uint16Array;
stackPointer: number; // 16b
stack: Uint16Array; // 16b
memory: Uint8Array;
displayMemory: Uint8Array;
@ -27,10 +27,8 @@ class CPU {
keyboard: Keyboard;
audio: Chip8Audio;
rng: RNG;
constructor(keyboard: Keyboard, audio: Chip8Audio) {
this.memory = new Uint8Array(MEMORY_SIZE);
this.displayMemory = new Uint8Array(SCREEN_WIDTH*SCREEN_HEIGHT);
@ -77,7 +75,7 @@ class CPU {
private setupFont() {
// Using address from 050 - 09F ??
// Using address from 050 - 09F
let addressFont = 0x050;
// Every character has 5 Bytes
@ -104,7 +102,7 @@ class CPU {
}
public loadRom(rom: Uint8Array) {
// Loads a ROM into starting PC addres??
// Loads a ROM into starting PC address
console.log(rom);
for(let i = 0; i < rom.length; i++) {
this.memory[this.pc+i] = rom[i];
@ -283,8 +281,8 @@ class CPU {
// Vx <<= 1
// Set VF to 1 if the most significant bit of VX.
// Then shift to the left Vx
this.regs[0xF] = (this.regs[nib2]) >> 7;
this.regs[nib2] = (this.regs[nib2] << 1);
this.regs[0xF] = (this.regs[nib2]) >> 7; // Get msb
this.regs[nib2] = (this.regs[nib2] << 1) & 0xFF;
this.incrementPC();
}
@ -391,7 +389,7 @@ class CPU {
}
if(!keyPressed)
return; // NOT INCREMENT PC SO WE ARE STUCK IN THIS WAITING
return; // NOT INCREMENT PC SO WE ARE STUCK IN THIS WAITING (also don't decrement timers???)
this.incrementPC();
}else if(secondOpcode == 0x15) {