HP -16C Owner's Handbook Manual page 99

Appendix A: Errors and Flags 97
Error 2: Improper Bit Number
or [MASKR], where | x| > current word size.
or [RRn], where|x|> current word size.
or [RRCn], where | x| > (current word size + 1).
(SB], [CB], or [B?], where| x| = current word size.
[WSIZE], where|x|> 64.
Error 3: Improper Register Number
Storage register named is nonexistent.
Error 4: Improper Label or Line Number Call
Label or line number called is nonexistent. Attempted to load more
than 203 program lines.
Error 5: Subroutine Level Too Deep
Subroutine nested more than four deep.
Error 6: Invalid Register Contents
In Floating-Point Decimal mode, an attempt was made to recall the
contents of a storage register (including R;) whose contents are not
in floating-point decimal format.
In Floating-Point Decimal mode, or was used when the
contents of R; were not in floating-point format.
Error 9: Service
Self-test discovered circuitry problem, or wrong key pressed during
key test. Refer to appendix C.
Pr Error (Power Error)
Continuous Memory interrupted and reset because of power failure.