For correct operation of Broderbund products on the PCjr, DOS 2.1 must be
patched. An explanation of the patches and the problems that they correct
can be found in the file DOS21.DOC. The necessary patch files are available
through most IBM dealers. As a convenience, Broderbund has been authorized
to distribute these files with our product. The files are:

DOS21.DOC:    An explanation of the patch and the problems that it corrects.
UPDATE21.BAT: The batch file to perform the update.
PATCH.COM:    The program that performs the update.
DOS21:        Input file for PATCH.COM.

To perform the patch:
1: Make a copy of your DOS 2.1 disk.
2: Run UPDATE21.BAT and follow the prompts, using your copy of DOS 2.1.