diff --git a/README.md b/README.md
index 2f9ef6a..8662896 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ A ROM patcher made in HTML5.
 * Supported formats:
    * IPS
    * UPS
-   * APS
+   * APS (N64/GBA)
    * BPS
    * RUP
    * PPF
diff --git a/_cache_service_worker.js b/_cache_service_worker.js
index cf9e35c..7b26362 100644
--- a/_cache_service_worker.js
+++ b/_cache_service_worker.js
@@ -14,7 +14,7 @@
 */
 
 var PRECACHE_ID='rom-patcher-js';
-var PRECACHE_VERSION='v27b';
+var PRECACHE_VERSION='v28';
 var PRECACHE_URLS=[
 	'/RomPatcher.js/','/RomPatcher.js/index.html',
 	'/RomPatcher.js/manifest.json',
@@ -41,7 +41,8 @@ var PRECACHE_URLS=[
 	'/RomPatcher.js/js/zip.js/inflate.js',
 	'/RomPatcher.js/js/formats/ips.js',
 	'/RomPatcher.js/js/formats/ups.js',
-	'/RomPatcher.js/js/formats/aps.js',
+	'/RomPatcher.js/js/formats/aps_n64.js',
+	'/RomPatcher.js/js/formats/aps_gba.js',
 	'/RomPatcher.js/js/formats/bps.js',
 	'/RomPatcher.js/js/formats/rup.js',
 	'/RomPatcher.js/js/formats/ppf.js',
diff --git a/index.html b/index.html
index a342ebe..a08b149 100644
--- a/index.html
+++ b/index.html
@@ -40,7 +40,8 @@
 	<script type="text/javascript" src="./js/formats/zip.js"></script>
 	<script type="text/javascript" src="./js/formats/ips.js"></script>
 	<script type="text/javascript" src="./js/formats/ups.js"></script>
-	<script type="text/javascript" src="./js/formats/aps.js"></script>
+	<script type="text/javascript" src="./js/formats/aps_n64.js"></script>
+	<script type="text/javascript" src="./js/formats/aps_gba.js"></script>
 	<script type="text/javascript" src="./js/formats/bps.js"></script>
 	<script type="text/javascript" src="./js/formats/rup.js"></script>
 	<script type="text/javascript" src="./js/formats/ppf.js"></script>
@@ -179,7 +180,7 @@
 		<button id="button-settings" class="button-outer"><img src="style/icon_settings.svg" class="icon settings" /> <span data-localize="settings">Settings</span></button>
 	</div>
 
-	Rom Patcher JS <small>v2.7.1</small> by <a href="/">Marc Robledo</a>
+	Rom Patcher JS <small>v2.8</small> by <a href="/">Marc Robledo</a>
 	<br />
 	<img src="style/icon_github.svg" class="icon github" /> <a href="https://github.com/marcrobledo/RomPatcher.js/" target="_blank">See on GitHub</a>
 	<img src="style/icon_heart.svg" class="icon heart" /> <a href="https://www.paypal.me/marcrobledo/5" target="_blank" rel="nofollow">Donate</a>
diff --git a/js/RomPatcher.js b/js/RomPatcher.js
index de5070c..66652a0 100644
--- a/js/RomPatcher.js
+++ b/js/RomPatcher.js
@@ -1,4 +1,4 @@
-/* Rom Patcher JS v20230202 - Marc Robledo 2016-2023 - http://www.marcrobledo.com/license */
+/* Rom Patcher JS v20230331 - Marc Robledo 2016-2023 - http://www.marcrobledo.com/license */
 
 const TOO_BIG_ROM_SIZE=67108863;
 const HEADERS_INFO=[
@@ -663,8 +663,10 @@ function _readPatchFile(){
 			patch=parseIPSFile(patchFile);
 		}else if(header.startsWith(UPS_MAGIC)){
 			patch=parseUPSFile(patchFile);
-		}else if(header.startsWith(APS_MAGIC)){
+		}else if(header.startsWith(APS_N64_MAGIC)){
 			patch=parseAPSFile(patchFile);
+		}else if(header.startsWith(APS_GBA_MAGIC)){
+			patch=APSGBA.fromFile(patchFile);
 		}else if(header.startsWith(BPS_MAGIC)){
 			patch=parseBPSFile(patchFile);
 		}else if(header.startsWith(RUP_MAGIC)){
diff --git a/js/crc.js b/js/crc.js
index 4187570..4c8240d 100644
--- a/js/crc.js
+++ b/js/crc.js
@@ -108,126 +108,19 @@ function adler32(marcFile, offset, len){
 
 
 
-/* CRC16 */
-/*
-const CRC16_TABLE=(function(){
-	var c,crcTable=[];
-	for(var n=0;n<256;n++){
-		c=n;
-		for(var k=0;k<8;k++)
-			c=((c&1)?(0x8408^(c>>>1)):(c>>>1));
-		crcTable[n]=c;
+/* CRC16/CCITT-FALSE */
+function crc16(marcFile, offset, len){
+	var crc=0xffff;
+
+	offset=offset? offset : 0;
+	len=len && len>0? len : marcFile.fileSize;
+
+	for(var i=0; i<len; i++){
+		crc ^= marcFile._u8array[offset++] << 8;
+        for (j=0; j<8; ++j) {
+            crc = (crc & 0x8000) >>> 0 ? (crc << 1) ^ 0x1021 : crc << 1;
+        }
 	}
-	return crcTable;
-}());
-function crc16(marcFile){
-	var crc=0^(-1);
 
-	for(var i=0;i<marcFile._u8array.length;i++)
-		crc=((crc>>>8)&0x0ff)^CRC16_TABLE[(crc^marcFile._u8array[i])&0xff];
-
-	return ((crc^(-1))>>>0) & 0xffff;
+	return crc & 0xffff;
 }
-*/
-
-
-
-		
-		
-		
-
-/* specific ROM checksums */
-/* this is unused code, might be used in a future so ROM checksums can be fixed after patching */
-const CONSOLES=[
-	{
-		title:'Sega Mega Drive/Genesis',
-		MEGADRIVE_LOGO:[0x53, 0x45, 0x47, 0x41, 0x20, 0x4d, 0x45, 0x47, 0x41, 0x20, 0x44, 0x52],
-		GENESIS_LOGO:[0x53, 0x45, 0x47, 0x41, 0x20, 0x47, 0x45, 0x4e, 0x45, 0x53, 0x49, 0x53],
-		checkHeader:function(marcFile){
-			var megadrive=true;
-			var genesis=true;
-			for(var i=0; i<12 && (megadrive || genesis); i++){
-				if(marcFile._u8array[0x100+i]!==this.MEGADRIVE_LOGO[i])
-					megadrive=false;
-				if(marcFile._u8array[0x100+i]!==this.GENESIS_LOGO[i])
-					genesis=false;
-			}
-			return megadrive || genesis;
-		},
-		getChecksum:function(marcFile){
-			return (marcFile._u8array[0x018e]<<8) + marcFile._u8array[0x018f];
-		},
-		recalculateChecksum:function(marcFile){
-			var checksum=0;
-
-			for(var i=0x200; i<marcFile.fileSize; i+=2)
-				checksum=(checksum + (((marcFile._u8array[i]<<8) + marcFile._u8array[i+1])>>>0)) & 0xffff;
-
-			return checksum
-		},
-		updateChecksum:function(marcFile, newChecksum){
-			marcFile._u8array[0x18e]=newChecksum>>8;
-			marcFile._u8array[0x18f]=newChecksum & 0xff;
-		}
-	},{
-		title:'Game Boy',
-		NINTENDO_LOGO:[0xce, 0xed, 0x66, 0x66, 0xcc, 0x0d, 0x00, 0x0b, 0x03, 0x73, 0x00, 0x83, 0x00, 0x0c, 0x00, 0x0d],
-		checkHeader:function(marcFile){
-			for(var i=0; i<this.NINTENDO_LOGO.length; i++){
-				if(marcFile._u8array[0x104+i]!==this.NINTENDO_LOGO[i])
-					return false;
-			}
-			return true;
-		},
-		getChecksum:function(marcFile){
-			return marcFile._u8array[0x14d]
-		},
-		recalculateChecksum:function(marcFile){
-			var checksum=0;
-
-			for(var i=0x134; i<0x014d; i++){
-				checksum=(checksum - marcFile._u8array[i] - 1) & 0xff;
-			}
-
-			return checksum
-		},
-		updateChecksum:function(marcFile, newChecksum){
-			marcFile._u8array[0x014d]=newChecksum;
-
-
-			/* global checksum isn't checked by real hw, but fix it anyway */
-			var globalChecksumOld=(marcFile._u8array[0x014e]<<8) + marcFile._u8array[0x014f];
-			var globalChecksumNew=0;
-			for(var i=0x0000; i<0x014e; i++)
-				globalChecksumNew=((globalChecksumNew + marcFile._u8array[i]) >>> 0) & 0xffff;
-			for(i=0x0150;i<marcFile.fileSize; i++)
-				globalChecksumNew=((globalChecksumNew + marcFile._u8array[i]) >>> 0) & 0xffff;
-			if(globalChecksumOld!==globalChecksumNew){
-				marcFile._u8array[0x014e]=globalChecksumNew>>8;
-				marcFile._u8array[0x014f]=globalChecksumNew & 0xff;
-			}
-		}
-	}
-];
-function checkConsole(marcFile){
-	return false;
-}
-function fixConsoleChecksum(marcFile){
-	var system=false;
-	for(var i=0; i<CONSOLES.length && !system; i++)
-		if(CONSOLES[i].checkHeader(marcFile))
-			system=CONSOLES[i];
-	if(!system)
-		return false;
-	
-	var oldChecksum=console.getChecksum(marcFile);
-	var newChecksum=console.recalculateChecksum(marcFile);
-	
-	if(oldChecksum!==newChecksum)
-		if(alert('Fix '+console.title+' checksum?')){
-			console.updateChecksum(marcFile, newChecksum);
-			return true;
-		}
-	
-	return false;
-}
\ No newline at end of file
diff --git a/js/formats/aps_gba.js b/js/formats/aps_gba.js
new file mode 100644
index 0000000..6cc5017
--- /dev/null
+++ b/js/formats/aps_gba.js
@@ -0,0 +1,114 @@
+/* APS (GBA) module for Rom Patcher JS v20230331 - Marc Robledo 2017-2023 - http://www.marcrobledo.com/license */
+/* File format specification: https://github.com/btimofeev/UniPatcher/wiki/APS-(GBA) */
+
+const APS_GBA_MAGIC='APS1';
+const APS_GBA_BLOCK_SIZE=0x010000; //64Kb
+const APS_GBA_RECORD_SIZE=4 + 2 + 2 + APS_GBA_BLOCK_SIZE;
+
+function APSGBA(){
+	this.sourceSize=0;
+	this.targetSize=0;
+	this.records=[];
+}
+APSGBA.prototype.addRecord=function(offset, sourceCrc16, targetCrc16, xorBytes){
+	this.records.push({
+		offset:offset,
+		sourceCrc16:sourceCrc16,
+		targetCrc16:targetCrc16,
+		xorBytes:xorBytes}
+	);
+}
+APSGBA.prototype.toString=function(){
+	var s='Total records: '+this.records.length;
+	s+='\nInput file size: '+this.sourceSize;
+	s+='\nOutput file size: '+this.targetSize;
+	return s
+}
+APSGBA.prototype.validateSource=function(sourceFile){
+	if(sourceFile.fileSize!==this.sourceSize)
+		return false;
+
+	var originalEndianness=sourceFile.littleEndian;
+	sourceFile.littleEndian=true;
+	for(var i=0; i<this.records.length; i++){
+		sourceFile.seek(this.records[i].offset);
+		var bytes=sourceFile.readBytes(APS_GBA_BLOCK_SIZE);
+		if(crc16(sourceFile, this.records[i].offset, APS_GBA_BLOCK_SIZE) !== this.records[i].sourceCrc16)
+			return false
+	}
+	sourceFile.littleEndian=originalEndianness;
+
+	return true
+}
+APSGBA.prototype.export=function(fileName){
+	var patchFileSize=12 + (this.records.length * APS_GBA_RECORD_SIZE);
+
+	tempFile=new MarcFile(patchFileSize);
+	tempFile.littleEndian=true;
+	tempFile.fileName=fileName+'.aps';
+	tempFile.writeString(APS_GBA_MAGIC, APS_GBA_MAGIC.length);
+	tempFile.writeU32(this.sourceSize);
+	tempFile.writeU32(this.targetSize);
+
+	for(var i=0; i<this.records.length; i++){
+		tempFile.writeU32(this.records[i].offset);
+		tempFile.writeU16(this.records[i].sourceCrc16);
+		tempFile.writeU16(this.records[i].targetCrc16);
+		tempFile.writeBytes(this.records[i].xorBytes);
+	}
+
+	return tempFile
+}
+
+APSGBA.prototype.apply=function(romFile, validate){
+	if(validate && !this.validateSource(romFile)){
+		throw new Error('error_crc_input');
+	}
+
+	tempFile=new MarcFile(this.targetSize);
+	romFile.copyToFile(tempFile, 0, romFile.fileSize);
+
+	for(var i=0; i<this.records.length; i++){
+		romFile.seek(this.records[i].offset);
+		tempFile.seek(this.records[i].offset);
+		for(var j=0; j<APS_GBA_RECORD_SIZE; j++){
+			tempFile.writeU8(romFile.readU8() ^ this.records[i].xorBytes[j]);
+		}
+
+		if(validate && crc16(tempFile, this.records[i].offset, APS_GBA_BLOCK_SIZE)!==this.records[i].targetCrc16){
+			throw new Error('error_crc_output');
+		}
+	}
+
+
+
+	return tempFile
+}
+
+
+APSGBA.fromFile=function(patchFile){
+	patchFile.seek(0);
+	patchFile.littleEndian=true;
+
+	if(
+		patchFile.readString(APS_GBA_MAGIC.length)!==APS_GBA_MAGIC ||
+		patchFile.fileSize < (12 + APS_GBA_RECORD_SIZE) ||
+		(patchFile.fileSize-12)%APS_GBA_RECORD_SIZE!==0
+	)
+		return null;
+
+	var patch=new APSGBA();
+
+	patch.sourceSize=patchFile.readU32();
+	patch.targetSize=patchFile.readU32();
+
+	while(!patchFile.isEOF()){
+		var offset=patchFile.readU32();
+		var sourceCrc16=patchFile.readU16();
+		var targetCrc16=patchFile.readU16();
+		var xorBytes=patchFile.readBytes(APS_GBA_BLOCK_SIZE);
+		
+		patch.addRecord(offset, sourceCrc16, targetCrc16, xorBytes);
+	}
+	return patch;
+}
diff --git a/js/formats/aps.js b/js/formats/aps_n64.js
similarity index 98%
rename from js/formats/aps.js
rename to js/formats/aps_n64.js
index c7f837a..b51efc2 100644
--- a/js/formats/aps.js
+++ b/js/formats/aps_n64.js
@@ -1,7 +1,7 @@
 /* APS (N64) module for Rom Patcher JS v20180930 - Marc Robledo 2017-2018 - http://www.marcrobledo.com/license */
 /* File format specification: https://github.com/btimofeev/UniPatcher/wiki/APS-(N64) */
 
-const APS_MAGIC='APS10';
+const APS_N64_MAGIC='APS10';
 const APS_RECORD_RLE=0x0000;
 const APS_RECORD_SIMPLE=0x01;
 const APS_N64_MODE=0x01;
@@ -61,7 +61,7 @@ APS.prototype.export=function(fileName){
 	tempFile=new MarcFile(patchFileSize);
 	tempFile.littleEndian=true;
 	tempFile.fileName=fileName+'.aps';
-	tempFile.writeString(APS_MAGIC, APS_MAGIC.length);
+	tempFile.writeString(APS_N64_MAGIC, APS_N64_MAGIC.length);
 	tempFile.writeU8(this.headerType);
 	tempFile.writeU8(this.encodingMethod);
 	tempFile.writeString(this.description, 50);
diff --git a/js/worker_apply.js b/js/worker_apply.js
index 7044882..cc15664 100644
--- a/js/worker_apply.js
+++ b/js/worker_apply.js
@@ -1,10 +1,11 @@
-/* Rom Patcher JS v20200502 - Marc Robledo 2016-2020 - http://www.marcrobledo.com/license */
+/* Rom Patcher JS v20230331 - Marc Robledo 2016-2023 - http://www.marcrobledo.com/license */
 
 self.importScripts(
 	'./MarcFile.js',
 	'./crc.js',
 	'./formats/ips.js',
-	'./formats/aps.js',
+	'./formats/aps_n64.js',
+	'./formats/aps_gba.js',
 	'./formats/ups.js',
 	'./formats/bps.js',
 	'./formats/rup.js',
@@ -26,8 +27,10 @@ self.onmessage = event => { // listen for messages from the main thread
 		patch=parseIPSFile(patchFile);
 	}else if(header.startsWith(UPS_MAGIC)){
 		patch=parseUPSFile(patchFile);
-	}else if(header.startsWith(APS_MAGIC)){
+	}else if(header.startsWith(APS_N64_MAGIC)){
 		patch=parseAPSFile(patchFile);
+	}else if(header.startsWith(APS_GBA_MAGIC)){
+		patch=APSGBA.fromFile(patchFile);
 	}else if(header.startsWith(BPS_MAGIC)){
 		patch=parseBPSFile(patchFile);
 	}else if(header.startsWith(RUP_MAGIC)){
diff --git a/js/worker_create.js b/js/worker_create.js
index d023b70..2cbf47f 100644
--- a/js/worker_create.js
+++ b/js/worker_create.js
@@ -4,7 +4,7 @@ self.importScripts(
 	'./MarcFile.js',
 	'./crc.js',
 	'./formats/ips.js',
-	'./formats/aps.js',
+	'./formats/aps_n64.js',
 	'./formats/ups.js',
 	'./formats/bps.js',
 	'./formats/ppf.js',