HP (Hewlett-Packard) F2215AA#ABA ユーザーズマニュアル

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F-1
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Messages
The calculator responds to certain conditions or keystrokes by displaying a 
message. The 
 symbol comes on to call your attention to the message. For 
significant conditions, the message remains until you clear it. Pressing 
 or 
 
clears the message and the previous display content will be shown. Pressing any 
other key clears the message but the function of the key will not be executed
.
∫  
A running program attempted to select a program label 
(label) while an integration calculation was running.
∫ ∫ 
A running program attempted to integrate a program 
(∫
   variable) while another integration calculation 
was running.
∫ 
A running program attempted to solve a program while 
an integration calculation was running.
 
The catalog of variables ( 
 

 () ) 
indicates no values stored.
 
You set a wrong guess number (like a complex number 
or vector) when SOLVING equation for a variable.

The calculator is executing a function that might take a 
while.
   
Allow you to verify clearing everything in memory.
   
Allows you to verily clearing the equation you are 
editing. (Occurs only in Equation–entry mode.)
   
Allows you to verify clearing all programs in memory. 
(Occurs only in Program–entry mode.)
  
Attempted to divide by zero. (Includes 

 if Y–
register contains zero.)

Attempted to enter a program label that already exists 
for another program routine.