Radio Shack TRS-80 Model 100 Basic Manual page 35

Also, you should be aware that a file cannot be deleted if the same file is also in
working memory. That is, if you LOAD a program from RAM into working memory
and then attempt to KILL this file, you will get an error message. You should first
delete the program in working memory with the NEW command and then proceed to
KILL the file in RAM.
What you have learned:
You have learned how to SAVE BASIC programs in RAM and on cassette tape. You
learned how to LOAD a program from RAM or from tape and how to verify that a
program has been saved correctly. You also learned how to MERGE a SAVEd .
program with a program in working memory. You found out that in MERGE
operations, if line numbers in RAM are in common with line numbers in working
memory, the line numbers of the RAM file take precedence over those in working
memory. Finally, you learned how to delete files from working memory and from
RAM.
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