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/*
JSNES, based on Jamie Sanders' vNES
Copyright (C) 2010 Ben Firshman
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
JSNES.ROM = function(nes) {
this.nes = nes;
this.mapperName = new Array(92);
for (var i=0;i<92;i++) {
this.mapperName[i] = "Unknown Mapper";
}
this.mapperName[ 0] = "Direct Access";
this.mapperName[ 1] = "Nintendo MMC1";
this.mapperName[ 2] = "UNROM";
this.mapperName[ 3] = "CNROM";
this.mapperName[ 4] = "Nintendo MMC3";
this.mapperName[ 5] = "Nintendo MMC5";
this.mapperName[ 6] = "FFE F4xxx";
this.mapperName[ 7] = "AOROM";
this.mapperName[ 8] = "FFE F3xxx";
this.mapperName[ 9] = "Nintendo MMC2";
this.mapperName[10] = "Nintendo MMC4";
this.mapperName[11] = "Color Dreams Chip";
this.mapperName[12] = "FFE F6xxx";
this.mapperName[15] = "100-in-1 switch";
this.mapperName[16] = "Bandai chip";
this.mapperName[17] = "FFE F8xxx";
this.mapperName[18] = "Jaleco SS8806 chip";
this.mapperName[19] = "Namcot 106 chip";
this.mapperName[20] = "Famicom Disk System";
this.mapperName[21] = "Konami VRC4a";
this.mapperName[22] = "Konami VRC2a";
this.mapperName[23] = "Konami VRC2a";
this.mapperName[24] = "Konami VRC6";
this.mapperName[25] = "Konami VRC4b";
this.mapperName[32] = "Irem G-101 chip";
this.mapperName[33] = "Taito TC0190/TC0350";
this.mapperName[34] = "32kB ROM switch";
this.mapperName[64] = "Tengen RAMBO-1 chip";
this.mapperName[65] = "Irem H-3001 chip";
this.mapperName[66] = "GNROM switch";
this.mapperName[67] = "SunSoft3 chip";
this.mapperName[68] = "SunSoft4 chip";
this.mapperName[69] = "SunSoft5 FME-7 chip";
this.mapperName[71] = "Camerica chip";
this.mapperName[78] = "Irem 74HC161/32-based";
this.mapperName[91] = "Pirate HK-SF3 chip";
};
JSNES.ROM.prototype = {
// Mirroring types:
VERTICAL_MIRRORING: 0,
HORIZONTAL_MIRRORING: 1,
FOURSCREEN_MIRRORING: 2,
SINGLESCREEN_MIRRORING: 3,
SINGLESCREEN_MIRRORING2: 4,
SINGLESCREEN_MIRRORING3: 5,
SINGLESCREEN_MIRRORING4: 6,
CHRROM_MIRRORING: 7,
header: null,
rom: null,
vrom: null,
vromTile: null,
romCount: null,
vromCount: null,
mirroring: null,
batteryRam: null,
trainer: null,
fourScreen: null,
mapperType: null,
valid: false,
load: function(data) {
var i, j, v;
if (data.indexOf("NES\x1a") === -1) {
this.nes.ui.updateStatus("Not a valid NES ROM.");
return;
}
this.header = new Array(16);
for (i = 0; i < 16; i++) {
this.header[i] = data.charCodeAt(i) & 0xFF;
}
this.romCount = this.header[4];
this.vromCount = this.header[5]*2; // Get the number of 4kB banks, not 8kB
this.mirroring = ((this.header[6] & 1) !== 0 ? 1 : 0);
this.batteryRam = (this.header[6] & 2) !== 0;
this.trainer = (this.header[6] & 4) !== 0;
this.fourScreen = (this.header[6] & 8) !== 0;
this.mapperType = (this.header[6] >> 4) | (this.header[7] & 0xF0);
/* TODO
if (this.batteryRam)
this.loadBatteryRam();*/
// Check whether byte 8-15 are zero's:
var foundError = false;
for (i=8; i<16; i++) {
if (this.header[i] !== 0) {
foundError = true;
break;
}
}
if (foundError) {
this.mapperType &= 0xF; // Ignore byte 7
}
// Load PRG-ROM banks:
this.rom = new Array(this.romCount);
var offset = 16;
for (i=0; i < this.romCount; i++) {
this.rom[i] = new Array(16384);
for (j=0; j < 16384; j++) {
if (offset+j >= data.length) {
break;
}
this.rom[i][j] = data.charCodeAt(offset + j) & 0xFF;
}
offset += 16384;
}
// Load CHR-ROM banks:
this.vrom = new Array(this.vromCount);
for (i=0; i < this.vromCount; i++) {
this.vrom[i] = new Array(4096);
for (j=0; j < 4096; j++) {
if (offset+j >= data.length){
break;
}
this.vrom[i][j] = data.charCodeAt(offset + j) & 0xFF;
}
offset += 4096;
}
// Create VROM tiles:
this.vromTile = new Array(this.vromCount);
for (i=0; i < this.vromCount; i++) {
this.vromTile[i] = new Array(256);
for (j=0; j < 256; j++) {
this.vromTile[i][j] = new JSNES.PPU.Tile();
}
}
// Convert CHR-ROM banks to tiles:
var tileIndex;
var leftOver;
for (v=0; v < this.vromCount; v++) {
for (i=0; i < 4096; i++) {
tileIndex = i >> 4;
leftOver = i % 16;
if (leftOver < 8) {
this.vromTile[v][tileIndex].setScanline(
leftOver,
this.vrom[v][i],
this.vrom[v][i+8]
);
}
else {
this.vromTile[v][tileIndex].setScanline(
leftOver-8,
this.vrom[v][i-8],
this.vrom[v][i]
);
}
}
}
this.valid = true;
},
getMirroringType: function() {
if (this.fourScreen) {
return this.FOURSCREEN_MIRRORING;
}
if (this.mirroring === 0) {
return this.HORIZONTAL_MIRRORING;
}
return this.VERTICAL_MIRRORING;
},
getMapperName: function() {
if (this.mapperType >= 0 && this.mapperType < this.mapperName.length) {
return this.mapperName[this.mapperType];
}
return "Unknown Mapper, "+this.mapperType;
},
mapperSupported: function() {
return typeof JSNES.Mappers[this.mapperType] !== 'undefined';
},
createMapper: function() {
if (this.mapperSupported()) {
return new JSNES.Mappers[this.mapperType](this.nes);
}
else {
this.nes.ui.updateStatus("This ROM uses a mapper not supported by JSNES: "+this.getMapperName()+"("+this.mapperType+")");
return null;
}
}
};
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