diff --git a/apple2js.html b/apple2js.html
index b7406b8..c0721dc 100644
--- a/apple2js.html
+++ b/apple2js.html
@@ -167,6 +167,7 @@
               <select id="computer_type2" value="apple2plus" onchange="Apple2.updateCPU()">
                 <option value="apple2plus">Apple ][+</option>
                 <option value="apple2">Autostart Apple ][</option>
+                <option value="apple213">13 Sector Apple ][</option>
                 <option value="original">Apple ][</option>
                 <option value="apple2j">Apple ][j+</option>
                 <option value="apple2lc">Apple ][+ (lowercase font)</option>
diff --git a/js/main2.js b/js/main2.js
index bfd2897..215b310 100644
--- a/js/main2.js
+++ b/js/main2.js
@@ -29,11 +29,16 @@ var prefs = new Prefs();
 var romVersion = prefs.readPref('computer_type2');
 var rom;
 var characterRom = apple2_charset;
+var sectors = 16;
 
 switch (romVersion) {
 case 'apple2':
     rom = new IntBASIC();
     break;
+case 'apple213':
+    rom = new IntBASIC();
+    sectors = 13;
+    break;
 case 'original':
     rom = new OriginalROM();
     break;
@@ -96,7 +101,7 @@ var lc = new LanguageCard(io, rom);
 var parallel = new Parallel(io, printer);
 var videoTerm = new VideoTerm(io, options.screen[0]);
 var slinky = new RAMFactor(io, 1024 * 1024);
-var disk2 = new DiskII(io, driveLights);
+var disk2 = new DiskII(io, driveLights, sectors);
 var clock = new Thunderclock(io);
 var cffa = new CFFA(io);
 
diff --git a/test/roms/6502_functional_test.bin b/test/roms/6502_functional_test.bin
index c9a35e1..962ab40 100644
Binary files a/test/roms/6502_functional_test.bin and b/test/roms/6502_functional_test.bin differ