diff --git a/lib/ac-api/src/test/java/com/webcodepro/applecommander/storage/DiskHelperTest.java b/lib/ac-api/src/test/java/com/webcodepro/applecommander/storage/DiskHelperTest.java
index 93ab10e..8b0e1c1 100644
--- a/lib/ac-api/src/test/java/com/webcodepro/applecommander/storage/DiskHelperTest.java
+++ b/lib/ac-api/src/test/java/com/webcodepro/applecommander/storage/DiskHelperTest.java
@@ -84,6 +84,13 @@ public class DiskHelperTest {
 		showDirectory(config.getDiskDir() + "/RDOSboot.dsk"); //$NON-NLS-1$
 	}
 
+	@Test
+	public void testRdos33Boot() throws IOException, DiskException {
+		FormattedDisk[] disks = showDirectory(config.getDiskDir() + "/RDOS_33_boot.dsk"); //$NON-NLS-1$
+		assertApplesoftFile(disks[0], "START"); //$NON-NLS-1$
+		assertTextFile(disks[0], "SYSTEMBOOT"); //$NON-NLS-1$
+	}
+
 	@Test
 	public void testSsiSave() throws IOException, DiskException {
 		showDirectory(config.getDiskDir() + "/SSIsave.dsk"); //$NON-NLS-1$
diff --git a/lib/ac-api/src/test/resources/disks/RDOS_33_boot.dsk b/lib/ac-api/src/test/resources/disks/RDOS_33_boot.dsk
new file mode 100644
index 0000000..51715ab
Binary files /dev/null and b/lib/ac-api/src/test/resources/disks/RDOS_33_boot.dsk differ