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(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
var RAM_SIZE = 2048;
var CPUMemory = /*#__PURE__*/function () {
  function CPUMemory() {
    _classCallCheck(this, CPUMemory);
    this.ram = new Uint8Array(RAM_SIZE);
  }
  _createClass(CPUMemory, [{
    key: "onLoad",
    value: function onLoad(ppu, apu, mapper, controllers) {
      this.ppu = ppu;
      this.apu = apu;
      this.mapper = mapper;
      this.controllers = controllers;
    }
  }, {
    key: "read",
    value: function 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;
    }
  }, {
    key: "write",
    value: function 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` */
    }
  }, {
    key: "read16",
    value: function read16(address) {
      return _byte.default.buildU16(this.read(address + 1), this.read(address));
    }
  }]);
  return CPUMemory;
}();
exports.default = CPUMemory;