4100 MT  (250-5160)             Addendum               Faxback Doc. # 2905

     The information in this addendum reflects the latest changes to the
     system BIOS.

Setup

     Page 18       To install the supplied mouse drivers, put the Mouse
                   Driver disk in Drive A.  Then type a:<Enter> followed
                   by Install<Enter>.

     Page 34       This system does not support a serial device configured
                   as COM 4.

     Page 46       The 20 MB and 40 MB memory configurations are not
                   currently supported.

Video Update

     Energy Star   This system does not support all Energy Star and Energy
                   Saver monitors.  Contact Radio Shack Customer Service
                   for compatibility information if you own an Energy Star
                   or Energy Saver monitor.

     MS Windows    If your monitor is not at least SVGA compatible,
                   Microsoft Windows might incorrectly detect and set
                   the video mode.  If this occurs, the monitor displays
                   horizontal bars or interference patterns during setup.
                   To correct this problem, reset the computer and
                   restart Windows Setup.  than manually select VGA as
                   your display type.  See the Microsoft Windows manual
                   for more information about customizing Windows for your
                   hardware.

Software Compatibility

     Microsoft Windows and some other applications that automatically
     sense your hardware type might incorrectly report that your
     computer has only a 80386/33 MHz processor.  Disregard these
     references.  Your computer has a 80486DX2/66 MHz processor.

(ALL/all-06/16/94)