Tandy 1000 Basic Reference Manual page 293

Chapter 10 I
BASIC Ke-ywords
RESET Statement
RESET
Closes all open files on all drives.
If a disk contains any open files, RESET writes all blocks in
memory to disk.
RESET ensures that all files on all diskettes are closed before
you remove them from the drives. RESET is the same as a
CLOSE statement for each open file.
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