Epson 500 Series - Manual (Page 34)

If necessary, press NumLock to turn Num Lock (and its LED) on.
Then, to change to low speed, press Ctrl Alt --. To change back to
high speed, make sure Num Lock is on, and press Ctrl Alt +.
Note
You must press -- or + on the embedded numeric keypad only.
Adjusting the LCD Screen
The screen on your ActionNote is a backlit monochrome or color
LCD. You can adjust the brightness and contrast with the two
controls on the top left side of the computer. Adjust the switches to
produce the best display for your viewing angle.
Slide the brightness switch to the right to lighten the screen, and to
the left to darken the screen. Slide the contrast switch to the right
to increase the contrast, and to the left to decrease the contrast.
Using Diskettes
Be sure to purchase high-quality diskettes to ensure
reliability. For
the 3.5-inch, 1.44MB diskette drive in your ActionNote, you can
use either of the following types of diskettes:
72OKB, double-sided, dauble-density (usually labelled 2DD)
1.44MB, double-sided, high-density (labelled 2HD).
Using Your Computer 2-9