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[ ON selector ] { GOSUB | GOTO } lineNumber [ , lineNumber ] ... ~ or ~ KEY [ { ON | OFF | key_number [ , definition ] } ] ~ or ~ { APPEND | BACKUP | BOOT | BLOAD | BSAVE | CATALOG | COLLECT | CONCAT | COPY | DIRECTORY | DLOAD | DSAVE | DVERIFY | HEADER | RENAME | RUN | SCRATCH } [ parameter ]... [ { , | ON } U device_number ] [ parameter ]...
Influence the behavior of other statements/commands.
It's main use is to select one of many program lines (a switch statement in other languages) using either GOTO or GOSUB. Example:
With the disk-related commands (DLOAD and friends), the ON preposition appears to perform the same task as a comma:
to seperate items in a list. However the ON keyword may be used where a comma would generate a SYNTAX ERROR.
Very hard to describe, so here are some examples!
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