Casio FX-7400GII - SOFTWARE VERSION 2-00 User Manual page 363

5. To change the real-time scroll setting, use the f and c cursor keys to move the
highlighting to "RealScroll". Next, press one of the function keys described below.
To specify this real-time scrolling setting:
Real-time scrolling on
Real-time scrolling off
6. Press w to finalize Graph Setup and return to the Advanced Setup menu.
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Using Advanced Setup
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Press this key:
1(On)
2(Off)