Unit installation

Uppercase/Graphic/Lowercase modes

As you know, the screen of your Commodore computer has two

modes for displaying letters of the alphabet and graphics characters.

They are the uppercase/graphic mode and the upper/lowercase

mode.

In the uppercase/graphic mode (also called the cursor up mode), all

letters are uppercase (capitalized) and many graphics characters are

available. In the upper/lowercase mode (also called the cursor down

mode), letters can be either upper or lowercase, but fewer graphics

characters are available.

To change from uppercase/graphic to upper/lowercase on the

screen, you press the

SHIFT

key and the

COMMODORE

key at the

same time. This command affects only the screen. For the

HomeWriter- to print in the upper/lowercase mode you must give

it the command to use that mode.

If you do not give the printer any special instructions, it always

prints in the uppercase/graphic mode. Therefore, all the examples so

far in this chapter have been printed in the uppercase/graphic mode.

Before you type any programs that use the upper/lowercase mode,

change the screen display to that mode by pressing the

COMMO-

DORE

key and the

SHIFT

key at the same time. That way the letters

will appear on your screen in the same mode that they are printed on

paper.

No matter whether you print in the uppercase/graphic mode or the

upper/lowercase mode, always have your screen display in the same

mode that you plan to print to avoid confusion. If your screen is in the

upper/lowercase mode and your printing is in the uppercase/graphic

mode, you will get graphics characters when you want uppercase

letters.

There are two ways to tell the HomeWriter- to use the upper/

lowercase mode:

Using an extra number (sometimes called a secondary address)

when you open a file

Using the code CHR$(17)