First forget your DOS program and begin to learn to program in PBCC. You can do that by studying examples of PBCC programs, then setting yourself simple problems to program in PBCC.
Then look at your DOS program. Try to break it into smaller programs and work on them one at a time. Compile the program. It fails. Look at the error messages. Rewrite, using the help file. Compile again, and so on.
It can be done. Not long ago I converted about a 10,000 line program from PBDOS to PBCC.
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