-#define CBM_T_DEL 0
-#define CBM_T_SEQ 1
-#define CBM_T_PRG 2
-#define CBM_T_USR 3
-#define CBM_T_REL 4
-#define CBM_T_CBM 5 /* 1581 sub-partition */
-#define CBM_T_DIR 6 /* IDE64 and CMD sub-directory */
-#define CBM_T_VRP 8 /* Vorpal fast-loadable format */
-#define CBM_T_OTHER 5 /* Other file-types not yet defined */
+#define CBM_T_DEL 0
+#define CBM_T_SEQ 1
+#define CBM_T_PRG 2
+#define CBM_T_USR 3
+#define CBM_T_REL 4
+#define CBM_T_CBM 5 /* 1581 sub-partition */
+#define CBM_T_DIR 6 /* IDE64 and CMD sub-directory */
+#define CBM_T_RESERVED 7 /* Not used, but kept free for compatibility */
+#define CBM_T_VRP 8 /* Vorpal fast-loadable format */
+#define CBM_T_OTHER 9 /* Other file-types not yet defined */
+#define CBM_T_HEADER 10 /* Disk header / title */