Appendix E
Messages and Errors
Following is a listing of all messages and errors that you might see in the HP-41C display.
Display Meaning
ALPHA DATA  The HP-41C attempted to perform a numeric operation, such as additon or subtraction, on non numeric data, or on an ALPHA string.
DATA ERROR  The HP-41C attempted to perform a meaningless operation. These errors are:
 
 ÷   where x = 0.
Yx  where y = 0 and x ≤ 0, or
  where y < 0 and x is non-integer.
   where x < 0.
1/X  where x = 0.
LOG  where x ≤ 0.
LN  where x ≤ 0.
LN1+X  where x ≤ –1.
COS–1  where | x | > 1.
SIN–1  where | x | > 1.
STO  ÷   where x = 0.
TONE  where | x | ≥ 10 or x < 0.
MEAN  where n = 0.
OCT  where | x | > 1073741823 (decimal), or x is non-integer.
DEC  where x contains an ALPHA, 8 of 9, or x is non-integer.
%CH  where y = 0.
FIX , SCI  
ENG  where absolute value of digits is ≥ 10 or is non-integer.
FACT  where x < 0 or x is non-integer.
MEMORY LOST  The continuous memory of the calculator has been cleared.
NON EXISTENT  The HP-41C has attempted to use a register that does not exist or is not currently allocated as a storage register.
  An attempt was made to ASN or XEQ a function that does not exist.
  An attempt was made to ASN , GTO , or XEQ and ALPHA or numeric label that does not exist.
  An attempt was made to GTO a line number that does not exist.
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