broken-neees/CPUMemory.js

A really broken NEEES emulator that introduces glitches and random bugs on purpose!

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _byte = _interopRequireDefault(require("./lib/byte"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const RAM_SIZE = 2048;
class CPUMemory {
  constructor() {
    this.ram = new Uint8Array(RAM_SIZE);
  }
  onLoad(ppu, apu, mapper, controllers) {
    this.ppu = ppu;
    this.apu = apu;
    this.mapper = mapper;
    this.controllers = controllers;
  }
  read(address) {
    // 2 KiB internal RAM
    if (address <= 0x07ff) return this.ram[address];

    // Mirrors of $0000-$07FF
    if (address >= 0x0800 && address <= 0x1fff) return this.read(0x0000 + (address - 0x0800) % 0x0800);

    /* 🐒 The rest of the components are mapped in `NEEES` */

    return 0;
  }
  write(address, value) {
    // 2 KiB internal RAM
    if (address <= 0x07ff) return this.ram[address] = value;

    // Mirrors of $0000-$07FF
    if (address >= 0x0800 && address <= 0x1fff) return this.write(0x0000 + (address - 0x0800) % 0x0800, value);

    /* 🐒 The rest of the components are mapped in `NEEES` */
  }
  read16(address) {
    return _byte.default.buildU16(this.read(address + 1), this.read(address));
  }
}
exports.default = CPUMemory;