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IOPORT(8)		  BSD System Manager's Manual		     IOPORT(8)

NAME
     ioport - enable, disable, or display user level access to I/O ports

SYNOPSIS
     ioport -a [iobase [count]]
     ioport -d [iobase [count]]
     ioport -e [iobase [count]]
     ioport [-v] -m iobase count
     ioport [-v] -u iobase count

DESCRIPTION
     The ioport program displays or modifies the I/O port protection map.
     This map can allow or disallow user level programs access to specific I/O
     port address ranges.  It is primarily useful in allowing the DOS compati-
     bility system to access devices like the game port (joystick).

     The three display modes, specified with the -a, -d, and -e flags, are es-
     sentially identical; they show enabled and/or disabled ports as a range.
     For instance, the output might look like this:

	   0x0000 - 0x03af : Disabled
	   0x03b0 - 0x03e7 : Enabled
	   0x03e8 - 0xffff : Disabled

     In this case, all I/O ports except those in the middle range are inacces-
     sible to user code.  With the -a flag, all ports are displayed; the -d
     and -e flags show only disabled or enabled ports, respectively.  If no
     iobase is given, scanning starts from port 0; if no count is given, scan-
     ning continues to the end of the valid range (0xffff).

     The map and unmap modes, specified with the -m (map) and -u (unmap)
     flags, require the iobase and count arguments, and enable (-m) or disable
     (-u) user level access to those ports.  If the -v argument is supplied,
     ioport will print a message stating the action it is about to perform.

     In all cases, iobase and count can be specified in decimal, hexadecimal,
     or octal.

HISTORY
     The ioport command first appeared in BSD/OS and is currently under devel-
     opment.  It may not be present in future releases.	 The display modes are
     modelled on code supplied by Jeff Kellem <composer@Beyond.Dreams.ORG>.

BSDI BSD/OS			January 5, 1994				     1

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