diff --git a/server/drivers/port.h b/server/drivers/port.h
index 1ed2605..f388263 100644
--- a/server/drivers/port.h
+++ b/server/drivers/port.h
@@ -7,27 +7,35 @@
  *
  * FreeBSD support by Guillaume Filion and Philip Pokorny, copyright 05/2001
  *
- * NetBSD port by Guillaume Filion, copyright 12/2001
+ * NetBSD port by Guillaume Filion, copyright 12/2001 and 02/2002
  */
 
 /*
-This file defines 4 static inline functions for port I/O:
+This file defines 6 static inline functions for port I/O:
 
-// Read a byte from port
-static inline int port_in (unsigned short int port);
-// Returns the content of the byte.
+Read a byte from port
+	static inline int port_in (unsigned short int port);
+Returns the content of the byte.
 
-// Write a char(byte) 'val' to port.
-static inline void port_out (unsigned short int port, unsigned char val);
-// Returns nothing.
+Write a char(byte) 'val' to port.
+	static inline void port_out (unsigned short int port, unsigned char val);
+Returns nothing.
 
-// Get access to a specific port
-static inline int port_access (unsigned short int port);
-// Returns 0 if successful, -1 if failed
+Get access to a specific port
+	static inline int port_access (unsigned short int port);
+Returns 0 if successful, -1 if failed
 
-// Get access 3 to ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
-static inline int port_access_full (unsigned short int port);
-// Returns 0 if successful, -1 if failed
+Close access to a specific port
+	static inline int port_deny (unsigned short int port);
+Returns 0 if successful, -1 if failed
+
+Get access 3 to ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
+	static inline int port_access_full (unsigned short int port);
+Returns 0 if successful, -1 if failed
+
+Close access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
+	static inline int port_deny_full (unsigned short int port);
+Returns 0 if successful, -1 if failed
 */
 
 #ifndef PORT_H
@@ -39,48 +47,54 @@ static inline int port_access_full (unsigned short int port);
 
 #include <stdio.h>
 
-// -------------------------------------------------------------
-// Use ioperm, inb and outb in <sys/io.h> (Linux)
+/*  ------------------------------------------------------------- */
+/*  Use ioperm, inb and outb in <sys/io.h> (Linux) */
 #if defined HAVE_IOPERM && HAVE_SYS_IO_H
 #include <sys/io.h>
 
-// Read a byte from port
+/*  Read a byte from port */
 static inline int port_in (unsigned short int port) {
 	return inb(port);
 }
 
-// Write a byte 'val' to port
+/*  Write a byte 'val' to port */
 static inline void port_out (unsigned short int port, unsigned char val) {
 	outb(val, port);
 }
 
-// Get access to a specific port
+/*  Get access to a specific port */
 static inline int port_access (unsigned short int port) {
 	return ioperm(port, 1, 255);
 }
 
-// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
+/*  Close access to a specific port */
+static inline int port_deny (unsigned short int port) {
+	return ioperm(port, 1, 0);
+}
+
+/*  Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
 static inline int port_access_full (unsigned short int port) {
 	return ioperm(port, 3, 255);
 }
 
+/*  Close access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
 static inline int port_deny_full (unsigned short int port) {
 	return ioperm(port, 3, 0);
 }
 
-// -------------------------------------------------------------
-// Use i386_get_ioperm, i386_set_ioperm, inb and outb from <machine/pio.h> (NetBSD)
+/*  ------------------------------------------------------------- */
+/*  Use i386_get_ioperm, i386_set_ioperm, inb and outb from <machine/pio.h> (NetBSD) */
 #elif defined HAVE_LIBI386 && defined HAVE_MACHINE_PIO_H && defined HAVE_MACHINE_SYSARCH_H
 #include <sys/types.h>
 #include <machine/pio.h>
 #include <machine/sysarch.h>
 
-// Read a byte from port
+/*  Read a byte from port */
 static inline int port_in (unsigned short int port) {
 	return inb(port);
 }
 
-// Write a byte 'val' to port
+/*  Write a byte 'val' to port */
 static inline void port_out (unsigned short int port, unsigned char val) {
 	outb(port, val);
 }
@@ -100,7 +114,7 @@ static inline void setaccess(u_long * map, u_int bit, int allow) {
 		map[word] |= mask;
 }
 
-// Get access to a specific port
+/*  Get access to a specific port */
 static inline int port_access (unsigned short int port) {
 	u_long          iomap[32];
 
@@ -113,7 +127,20 @@ static inline int port_access (unsigned short int port) {
 	return 0;
 }
 
-// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
+/*  Close access to a specific port */
+static inline int port_deny (unsigned short int port) {
+	u_long          iomap[32];
+
+	if (i386_get_ioperm(iomap) == -1) return -1;
+
+	setaccess(iomap, port, 0);
+
+	if (i386_set_ioperm(iomap) == -1) return -1;
+
+	return 0;
+}
+
+/*  Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
 static inline int port_access_full (unsigned short int port) {
 	u_long          iomap[32];
 
@@ -128,13 +155,28 @@ static inline int port_access_full (unsigned short int port) {
 	return 0;
 }
 
-//#endif // defined HAVE_LIBI386 && defined HAVE_SYS_TYPES_H && defined HAVE_MACHINE_PIO_H
+/*  Close access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
+static inline int port_deny_full (unsigned short int port) {
+	u_long          iomap[32];
 
-// -------------------------------------------------------------
-// Last chance! Use /dev/io and i386 ASM code (BSD4.3 ?)
+	if (i386_get_ioperm(iomap) == -1) return -1;
+
+	setaccess(iomap, port  , 0);
+	setaccess(iomap, port+1, 0);
+	setaccess(iomap, port+2, 0);
+
+	if (i386_set_ioperm(iomap) == -1) return -1;
+
+	return 0;
+}
+
+/* #endif // defined HAVE_LIBI386 && defined HAVE_SYS_TYPES_H && defined HAVE_MACHINE_PIO_H */
+
+/*  ------------------------------------------------------------- */
+/*  Last chance! Use /dev/io and i386 ASM code (BSD4.3 ?) */
 #else
 
-// Read a byte from port
+/*  Read a byte from port */
 static inline int port_in (unsigned short int port) {
 	unsigned char value;
 	__asm__ volatile ("inb %1,%0":"=a" (value)
@@ -142,29 +184,39 @@ static inline int port_in (unsigned short int port) {
 	return value;
 }
 
-// Write a byte 'val' to port
+/*  Write a byte 'val' to port */
 static inline void port_out (unsigned short int port, unsigned char val) {
 	__asm__ volatile ("outb %0,%1\n"::"a" (val), "d" (port)
 		 );
 }
 
-// Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA)
+/*  Get access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
 static inline int port_access_full (unsigned short int port) {
 	static FILE *  port_access_handle = NULL ;
 
 	if( port_access_handle
 	    || (port_access_handle = fopen("/dev/io", "rw")) != NULL ) {
-		return( 0 );  // Success
+		return( 0 );  /*  Success */
 	} else {
-		return( -1 );  // Failure
+		return( -1 );  /*  Failure */
 	};
 
 	return -1;
 }
 
-// Get access to a specific port
+/*  Get access to a specific port */
 static inline int port_access (unsigned short int port) {
-	return port_access_full(port); // /dev/io gives you access to all ports.
+	return port_access_full(port); /*  /dev/io gives you access to all ports. */
+}
+
+/*  Close access to 3 ports: port (CONTROL), port+1 (STATUS) and port+2 (DATA) */
+static inline int port_deny_full (unsigned short int port) {
+	/*  Can't close /dev/io... */
+}
+
+/* Close access to a specific port */
+static inline int port_deny (unsigned short int port) {
+	/* Can't close /dev/io... */
 }
 
 #endif
@@ -189,4 +241,4 @@ port_out (unsigned int port, unsigned char val)
 #endif
 */
 
-#endif // PORT_H
+#endif /*  PORT_H */