1. Refuses the let statement without any arguments
2. Ignore CTRL_A while the system is editing the memory.
The list of memory operation.
? delete a line
? substitutes a line
? DELETE a line
? RENUM br>
3. DELETE includes quitting all the tasks
4. Refuses the command consisting 8 bit letters
5. The letters received irregularly (FE,OVR) are stored as ~.
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2010-06-30
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