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                        ²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²
                        ²                              ²
                        ²     PCjrXTRA Version 1.0     ²
                        ²      (C) Copyright 1988      ²
                        ²              by              ²
                        ²        Randy Van Dyke        ²
                        ²                              ²
                        ²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²


        Purpose:

             PCJRXTRA.SYS is a Device Driver which gives the IBM PCjr a 
        high degree of compatibility with the PC.  Many of the hardware
        differences between the two computers are emulated with this
        program to allow many more programs written for the PC to run
        correctly on the PCjr.  Borland's Turbo C 1.0 and Microsoft's
        QuickBASIC versions 3.0 and 4.0 are examples.  Future programs
        written with Turbo C 1.0, such as games or applications, should
        run properly with this driver installed.  Also, many memory 
        resident programs which use keyboard interrupt 09h written 
        specifically for the PC will no longer lock-up your computer.  
        This driver also sets memory to the actual memory installed.  
        If there is memory above 128KB, then user memory begins in that 
        area to allow the PCjr to run at a fast pace.  Cartridge BASIC 
        will now run properly with memory expansion above 128KB.  This 
        also allows the SHELL command to work properly as long as there 
        is 16K used for video memory. This means that if you use 
        CLEAR,,,v where v is not equal to 16384 then this command must 
        be used with v equal to 16384 before SHELL can be used.  BASIC's 
        default is 16K.  Cartridge BASIC will work best if PCJRXTRA.SYS 
        is the only file in your CONFIG.SYS file.

        Installation:

            To use this Device Driver, simply copy the file PCJRXTRA.SYS
        to your boot disk.  Then add this filename to your CONFIG.SYS
        file in the form DEVICE = PCJRXTRA.SYS on the same disk.  If you
        are unfamiliar with a CONFIG.SYS file, consult your DOS manual
        on how to create one.  If you have other device drivers that you 
        wish to use such as a RAMDISK, merely include these drivers in 
        the CONFIG.SYS file along with PCJRXTRA.SYS.  It is best if  
        PCJRXTRA.SYS is the last driver in the file.  Once you have 
        these files on your boot disk, you can install the driver by 
        pressing CTRL+ALT+DEL simultaneously for a warm start or when you 
        turn the computer on.  Be sure that the PCJRXTRA.SYS file is on
        the disk with your CONFIG.SYS file or you will receive an error.

        Closing:

            If you find this program of value, a contribution of $10
        would be greatly appreciated.  Questions or Comments are also
        welcome.  Please mail to the following address.

                             Randy Van Dyke
                             134 N. Blackburn
                             Elk City, OK  73644