HP 35s Scientific F-4, number, F-4 Messages, you press a key, instruction  variable), a SOLVE operation was running, root. This might take a while

  	SOLVE (include EQN and PGM mode)cannot find the
	root of the equation using the current initial guesses (see
	page ). These conditions include: bad guess, solution
	not found, point of interest, left unequal to right. A
	SOLVE operation executed in a program does not
	produce this error; the same condition causes it instead
	to skip the next program line (the line following the
	instruction  variable).
	Warning (displayed momentarily); the magnitude of a
	result is too large for the calculator to handle. The
	calculator returns ±9.99999999999E499 in the current
	display format. (See "Range of Numbers and Overflow"
	on page .) This condition sets flag 6. If flag 5 is set,
	overflow has the added effect of halting a running
	program and leaving the message in the display until
	you press a key.
 	Indicates the "top" of program memory. The memory
	scheme is circular, so   is also the "line" after
	the last line in program memory.

 

 

The calculator is running an equation or program (other than a SOLVE or ∫FN routine).

Attempted to execute  variable or ∫  d variable without a selected program label. This can happen the first time that you use SOLVE or ∫ FN after the message  , or it can happen if the current label no longer exists.

 	A running program attempted to select a program label
	(label) while a SOLVE operation was running.
	A running program attempted to solve a program while
	a SOLVE operation was running.
∫ 	A running program attempted to integrate a program
	while a SOLVE operation was running.
	The calculator is solving an equation or program for its
	root. This might take a while.
	Attempted to calculate the square root of a negative
	number.

F-4Messages