Scrolling, Homing the cursor – Epson HX-20 User Manual

Page 44

Thus,

enable two cursor keys to move the cursor in

any of four different directions: left, right, up, and down. To select

horizontal movement, do not use

To select vertical

movement, you must use

Something special happens when you try to move the cursor beyond
the edge of the LCD screen. The cursor doesn’t move off the screen;
instead, the cursor stays in place and the text on the screen moves in

the opposite direction.

To see how this works, move the cursor down to the bottom row

of the screen. When you try to move the cursor down one more time,
the cursor doesn’t move-instead, all the text on the screen scrolls
up. In a similar manner, trying to move the cursor off the top or

right edge of the screen will cause the text to scroll appropriately.

This scrolling demonstrates that the LCD screen is acting as a

window onto the virtual screen. You can move the cursor anywhere

you like within the virtual screen, and the text will scroll automat-

ically, whenever necessary, to keep the cursor in view.

You can also scroll text with the

key. Press the

key and

text moves down the screen. Hold down

key and press

and text scrolls up the screen. Whether you use

you will note that the cursor remains in its position on the LCD

screen. (However, because

and

scroll the text

vertically, they each move the cursor to a new line in the virtual
screen.)

If you keep pressing the

key, you will discover at some point

that it has no effect. This occurs when the LCD screen is displaying
the top of the virtual screen.

Similarly, if you press

enough times, at some point the

LCD screen will display the bottom of the virtual screen.
Pressing

will then have no effect.

At any point you can move the cursor to the upper left corner of the

virtual screen, by homing the cursor. To home the cursor, hold
down

and press this key:

The LCD window will display the upper left portion of the

virtual screen, and in the upper left corner of the window you will

see the cursor. Bear in mind that homing the cursor does not change

any of the text in the virtual screen, although it may cause a different

portion of the virtual screen to appear in the window.