HP 35s HP 35s scientific calculator - User Guide - Page 347

F 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. Messages F-1