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ATKBDC(4)		     Kernel Interfaces Manual		       ATKBDC(4)

NAME
     atkbdc -- the AT keyboard controller interface

SYNOPSIS
     options KBD_RESETDELAY=N
     options KBD_MAXWAIT=N
     options KBDIO_DEBUG=N
     device atkbdc

     In /boot/device.hints:
     hint.atkbdc.0.at="isa"
     hint.atkbdc.0.port="0x060"

DESCRIPTION
     The  keyboard  controller	atkbdc provides I/O services for the AT keyboard
     and PS/2 mouse style pointing devices.  This controller is required for the
     keyboard driver atkbd and the PS/2 pointing device driver psm.

     There can be only one atkbdc device configured in the system.

DRIVER CONFIGURATION
   Kernel Configuration Options
     The following kernel configuration options  can  be  used	to  control  the
     atkbdc  driver.  They may be set in the kernel configuration file (see con-
     fig(8)).

     KBD_RESETDELAY=X, KBD_MAXWAIT=Y
	    The keyboard driver atkbd and the pointing device driver psm may ask
	    the atkbdc driver to reset these devices during  the  boot	process.
	    It	sometimes  takes a long time before these devices respond to the
	    reset command.  These options control how  long  the  atkbdc  driver
	    should  wait before eventually giving up -- the driver will wait X *
	    Y msecs at most.  If the drivers seem unable to detect devices,  you
	    may  want to increase these values.  The default values are 200 msec
	    for X and 5 for Y.

     KBDIO_DEBUG=N
	    Sets the debug level to N.	The default value is  zero,  which  sup-
	    presses all debugging output.

SEE ALSO
     atkbd(4), psm(4), config(8)

HISTORY
     The  atkbdc driver first appeared in FreeBSD 3.1.	It is based on the kbdio
     module in FreeBSD 2.2.

AUTHORS
     The kbdio module, the atkbdc driver and this manual page  were  written  by
     Kazutaka Yokota <yokota@FreeBSD.org>.

FreeBSD 11.1			February 9, 1999		       ATKBDC(4)
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