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sys_attrs_gpc_input(5)


NAME

  sys_attrs_gpc_input - gpc_input subsystem attributes


DESCRIPTION

  This reference page lists and describes attributes for the GPC Input
  (gpc_input) kernel subsystem. This subsystem handles mouse and keyboard
  input for both old style LK* keyboards and serial mice, and the newer PC-
  style (PS/2) keyboards and mice. In all supported scan codesets, unique
  single-byte scan codes differentiate the standalone Insert, Home, Page Up,
  Page Down, Delete, and End keys from the same keys on the numeric keypad
  (with Num Lock toggled to off).

  Refer to the sys_attrs(5) reference page for an introduction to the topic
  of kernel subsystem attributes.

  The gpc subsystem has a number of visible attributes.	 Of these, only the
  following should ever be modified:

  kbd_scancode
      A value that identifies the scan codeset generated by the keyboard.
      Only two values are supported for this attribute. The scan codesets
      that these values identify differ in how internal keyboard hardware
      distinguishes between the numeric keypad's Up Arrow (entered with with
      Num Lock toggled off) and the standalone Up Arrow key.

      3 (default)
	      Keyboard hardware sends different single-byte scan codes to
	      distinguish the standalone Up Arrow and the Up Arrow entered
	      through the numeric keyboard (with Num Lock toggled off).

      2	      Keyboard hardware sends two bytes for the standalone Up Arrow
	      and a single-byte scan code for the Up Arrow entered through
	      the numeric keyboard.

      These values are intended to be set by system software, not users.
      Although both values (scan codesets) work with most of the HP keyboards
      (both LK* and PC-style) used with Tru64 UNIX systems, 3 identifies the
      scan codeset that is most efficient for these keyboards. The keyboard
      of the AlphaBook (laptop) computer is the only supported keyboard that
      requires the 2 setting.  The scan codesets identified by these values
      may work with other (third-party) keyboards; however, we do not test or
      support other keyboards for use with Tru64 UNIX systems.

      It is possible to set kbd_scancode to a 0 or 1 value.  These values are
      currently undefined and will result in one of the following console
      errors:

      gpc_input_configure: scan code not supported

      ps2_input_configure: scan code not supported

      These errors are displayed independently of the setting for the
      gpc_developer_debug attribute.

  gpc_developer_debug
      Enables (1) or disables (0) boot- and run-time console messages used by
      systems programmers to debug device driver configuration problems.

      Default value: 0 (disabled)


SEE ALSO

  sys_attrs(5)

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