Casio TE-1500 User Manual page 16

Getting Started
9. Select watermark on receipt.
Turn the mode switch to "PGM", enter <0> or <1>, and press the <CH>, <ST>
Example: no watermark
with watermark
NOTE:
After completion of register programming, enter
(PGM mode ⇒ 7s) to backup the program data into the internal non-volatile memory.
(This opration takes about 30 seconds.)
16
E
2
0hs
2
1hs
6200 and s in the PGM 7 mode