1 files changed, 30 insertions, 0 deletions

diff --git a/v4.0/src/H/DPB.H b/v4.0/src/H/DPB.H
new file mode 100644
index 0000000..bfd28ac
--- /dev/null
+++ b/v4.0/src/H/DPB.H
@@ -0,0 +1,30 @@
+ struct DPBType {
+        char     drive ;        /* physical drive number                   */
+        char     unit ;         /* unit within device                      */
+        unsigned cbSector ;     /* bytes per sector                        */
+        char     mask ;         /* sectors/alloc unit - 1                  */
+        char     shift ;        /* bit to shift                            */
+        unsigned secFAT ;       /* sector number of first FAT              */
+        char     cFAT ;         /* count of FATs                           */
+        unsigned cDirEnt ;      /* count of root directory entries         */
+        unsigned secData ;      /* first data sector                       */
+        unsigned cCluster ;     /* max number of clusters on drive         */
+        unsigned csecFAT ;      /* sectors in each FAT                     */
+        unsigned secDir ;       /* first sector of root dir                */
+        long     pDevice ;      /* pointer to device header                */
+        char     media ;        /* last media in drive                     */
+        char     fFirst ;       /* TRUE => media check needed              */
+        long     nextDPB ;      /* pointer to next dpb                     */
+        unsigned clusFree ;     /* cluster number of last alloc            */
+        unsigned FreeCnt ;      /* count of free clusters, -1 if unk       */
+/*      char     SyncFlg ;      /* sync flags, (see below)                 */
+        } ;
+
+/*      Definitions of SyncFlg values from DPB.INC  */
+
+#define DPB_ABUSY  1        /* some process is allocating clusters */
+#define DPB_AWANT  2        /* some process waiting to allocate    */
+#define DPB_FBUSY  4        /* some process is reading FAT         */
+#define DPB_FWANT  8        /* some process waiting to read FAT    */
+
+
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