HP 33s - Manual (Page 349)

Messages F–1
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 b
clears the message; pressing any other key clears the message and executes that
key's function.
³  !# A running program attempted to select a program
label (/label) while an integration calculation was
running.
³ 1 ³ 2 A running program attempted to integrate a program (
³  G variable) while another integration calculation
was running.
³ 1 #2 A running program attempted to solve a program while
an integration calculation was running.
 # /
The catalog of variables ( { Y {# } )
indicates no values stored.
"! The calculator is executing a function that might take a
while.
  @ &  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 T if
Y–register contains zero.)
" !) Attempted to enter a program label that already exists
for another program routine.
   ! ! Indicates the "top" of equation memory. The memory
scheme is circular, so    ! ! is also the
"equation" after the last equation in equation memory.