I KEEP GETTING FATAL ERROR WHEN I TYPE A51 AT MY COMMAND LINE.
I GET TERMINATED.
WHY?
HOW DO I GET ULTRAEDIT TO DO IT?
Your shift key seems to be stuck. But I digress.
When you type only "A51" at the command line, you run the A51 assembler - without telling it which file to process. Since there is nothing meaningful for it to do, it prints an error message and exits.
What exactly are you trying to accomplish by running the A51 assembler from the command line ? Usually, the assembler is called by the IDE. Except for experimentation, there are very few reasons to actually run the assembler "by hand".
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