Victor 1230-4 Series Instruction Manual page 6

E. DISPLAY SYMBOLS
M : A NUMBER HAS BEEN STORED IN MEMORY.
E : ERROR OR OVERFLOW OF CAPACITY.
- : THE DISPLAYED VALUE IS NEGATIVE.
WARNING
•
DO NOT PRESS ANY KEY WHEN THERE IS NO PAPER AND THE PRINTER IS ON.
(OTHER THAN THE PAPER FEED KEY ↑)
•
FAILURE TO OBSERVE THIS WARNING WILL DAMAGE THE PRINT HEAD.
E 5