Ricoh VT2250 Operator's Manual page 84

How to protect a program
If you want to prevent someone from writing over your program, do the
following procedure.
While pressing the Reset key
1
and Stop key simultaneously,
press the Program key.
Enter "1" using the Number key.
2
Press the Enter key.
3
The numbers of the programs which
are not protected will be displayed in
the guidance display.
If all the user programs have been
protected or no program is stored,
the machine returns to the ready
condition.
OPERATION
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