                            ZAPDEBUG
                     (c) 1983 Tony Domigan
                          P.O. Box 150
                   Thomastown, Victoria, 3074
                           Australia

        ZAPDEBUG evolved from the need to modify TRSDOS 1.3B
sectors when there was no satisfactory utility available.  The
program patches the RST function so that DEBUG can be loaded
without executing.  Once loaded, DEBUG's 'F' command is
patched, the RST function is fixed and DEBUG is executed.
        When the 'F'ilespec option is selected, if a drivespec
is entered in place of a filespec then ZAPDEBUG takes over.  To
use ZAPDEBUG, therefore, you need to enter 'F' and answer the
filespec prompt with the drivespec of your choice e.g. '0'.
You will then be prompted for the sector number you require (in
Hexadecimal) e.g. 132, and it will be read into the buffer at
4300H.  Once in the buffer you can modify the sector as in
normal DEBUG, and when the ENTER key is hit the buffer will be
written to the disk.
        Hitting the BREAK key returns you to the FILESPEC
prompt. You can then enter a drivespec or filespec or if you
wish, hit the BREAK key again and you will return to normal
DEBUG (in place of DOS).
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