Worth Data TriCoder t53 User Manual page 113

The BEGIN key takes you to the first statement in your program file.
Pressing END takes you to the END OF FILE - the last statement filled
out with an Entry Type. You may have unused statements in a
program; maybe you deleted a statement (remember that it reserves the
statement number even though you have cleared all prompts) or you
may have left gaps on purpose, to insert new statements later.
If you attempt to edit a program but can only see the Upload Prefix and
Upload Suffix, you have data collected in the TriCoder and need to upload
before you can edit other fields in your program.
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