diff --git a/drivers/serial/dz.h b/drivers/serial/dz.h
index 86ef417..9674d4e 100644
--- a/drivers/serial/dz.h
+++ b/drivers/serial/dz.h
@@ -1,20 +1,22 @@
 /*
- * dz.h: Serial port driver for DECStations equiped 
+ * dz.h: Serial port driver for DECstations equipped
  *       with the DZ chipset.
  *
  * Copyright (C) 1998 Olivier A. D. Lebaillif 
  *             
  * Email: olivier.lebaillif@ifrsys.com
  *
+ * Copyright (C) 2004, 2006  Maciej W. Rozycki
  */
 #ifndef DZ_SERIAL_H
 #define DZ_SERIAL_H
 
 /*
- * Definitions for the Control and Status Received.
+ * Definitions for the Control and Status Register.
  */
 #define DZ_TRDY        0x8000                 /* Transmitter empty */
-#define DZ_TIE         0x4000                 /* Transmitter Interrupt Enable */
+#define DZ_TIE         0x4000                 /* Transmitter Interrupt Enbl */
+#define DZ_TLINE       0x0300                 /* Transmitter Line Number */
 #define DZ_RDONE       0x0080                 /* Receiver data ready */
 #define DZ_RIE         0x0040                 /* Receive Interrupt Enable */
 #define DZ_MSE         0x0020                 /* Master Scan Enable */
@@ -22,32 +24,44 @@
 #define DZ_MAINT       0x0008                 /* Loop Back Mode */
 
 /*
- * Definitions for the Received buffer. 
+ * Definitions for the Receiver Buffer Register.
  */
-#define DZ_RBUF_MASK   0x00FF                 /* Data Mask in the Receive Buffer */
-#define DZ_LINE_MASK   0x0300                 /* Line Mask in the Receive Buffer */
+#define DZ_RBUF_MASK   0x00FF                 /* Data Mask */
+#define DZ_LINE_MASK   0x0300                 /* Line Mask */
 #define DZ_DVAL        0x8000                 /* Valid Data indicator */
 #define DZ_OERR        0x4000                 /* Overrun error indicator */
 #define DZ_FERR        0x2000                 /* Frame error indicator */
 #define DZ_PERR        0x1000                 /* Parity error indicator */
 
-#define LINE(x) (x & DZ_LINE_MASK) >> 8       /* Get the line number from the input buffer */
-#define UCHAR(x) (unsigned char)(x & DZ_RBUF_MASK)
+#define LINE(x) ((x & DZ_LINE_MASK) >> 8)     /* Get the line number
+                                                 from the input buffer */
+#define UCHAR(x) ((unsigned char)(x & DZ_RBUF_MASK))
 
 /*
- * Definitions for the Transmit Register.
+ * Definitions for the Transmit Control Register.
  */
 #define DZ_LINE_KEYBOARD 0x0001
 #define DZ_LINE_MOUSE    0x0002
 #define DZ_LINE_MODEM    0x0004
 #define DZ_LINE_PRINTER  0x0008
 
+#define DZ_MODEM_RTS     0x0800               /* RTS for the modem line (2) */
 #define DZ_MODEM_DTR     0x0400               /* DTR for the modem line (2) */
+#define DZ_PRINT_RTS     0x0200               /* RTS for the prntr line (3) */
+#define DZ_PRINT_DTR     0x0100               /* DTR for the prntr line (3) */
+#define DZ_LNENB         0x000f               /* Transmitter Line Enable */
 
 /*
  * Definitions for the Modem Status Register.
  */
+#define DZ_MODEM_RI      0x0800               /* RI for the modem line (2) */
+#define DZ_MODEM_CD      0x0400               /* CD for the modem line (2) */
 #define DZ_MODEM_DSR     0x0200               /* DSR for the modem line (2) */
+#define DZ_MODEM_CTS     0x0100               /* CTS for the modem line (2) */
+#define DZ_PRINT_RI      0x0008               /* RI for the printer line (3) */
+#define DZ_PRINT_CD      0x0004               /* CD for the printer line (3) */
+#define DZ_PRINT_DSR     0x0002               /* DSR for the prntr line (3) */
+#define DZ_PRINT_CTS     0x0001               /* CTS for the prntr line (3) */
 
 /*
  * Definitions for the Transmit Data Register.