OSMKKEYB - OS/2 2.1 SESSION LOCKS UP WHEN KEYBOARDS ARE SWITCHED
02/07/96

=======================================================================
         OS/2 2.1 Session Locks Up when Keyboards Are Switched
=======================================================================

Please Read Entire Document for Full Explanation of Procedures
--------------------------------------------------------------

DESCRIPTION

OS/2 sessions lock up when keyboards are switched through a switchbox. 
"Hot plugging" works in WIN-OS/2 sessions, but is not supported in 
OS/2 2.1

RESOLUTION

If you are switching keyboards, consider:

* Keyboard BIOS revisions should be AMI version F, G, or H. Version F
  is specified in OS/2 documentation, and AMI has revisions G and H to
  update keyboard BIOS.

* The OS/2 keyboard device driver is very timing-sensitive. Cabling
  should be kept to short lengths to limit timing issues. Maximum cable
  length, from computer to keyboard, should be 10 feet.

* The keyboard scan code should be 100% IBM 101-key compatible.

* If the problem is intermittent, check the plug and socket. Eliminate
  adapters to ensure a good connection at the system.

* For PS/2 models, use Misco Inc. and Ruthers Inc. switchboxes.

______________________________________________________________________
IBM disclaims all warranties, whether express or implied, including 
without limitation, warranties of fitness and merchantability with 
respect to the information in this document. By furnishing this 
document, IBM grants no licenses to any related patents or copyrights.  
Copyright (c) 1994, 1996 IBM Corporation. Any trademarks and product 
or brand names referenced in this document are the property of their 
respective owners. Consult your product manuals for complete trademark 
information.