HP -225 Owner's Manual page 181

ALL VARS=8
All variables equal 0.
CALCULATING
The HP-22S is calculating a result.
DIVIDE BY ©
Attempt to divide by zero.
INPUT 2 NUMS
Attempt to execute a function that requires two arguments without
keying in both arguments.
INTERRUPTED
An or calculation has been interrupted.
INVALID DATA
Data error:
B Attempt to calculate combinations or permutations with r>n, or
with non-integer r or n.
B Attempt to use a trigonometric or hyperbolic function with an
unallowed argument.
u has generated a value greater than +1E500.
INVALID EQN
A syntax error has occurred during equation entry. (See "The Syntax
of Equations" on page 78.)
Messages 173