Commodore 128D - Introduction; The 40;80 Key

Introduction
— The 40180 Key
In C128 and CP/M modes, you can choose between a 40- and 80-
column screen display. You can even use both in a single program.
Each screen size has special uses. The 40-column screen is the
same size screen the Commodore 64 uses. With the 40-column
screen you can use the Commodore 128's full graphics capabilities.
You can draw circles, graphs, sprite characters, boxes and other
shapes in high-resolution or multicolor graphic modes. You can also
use sprites.
If you are using an 80-column display, you get twice the number of
characters per screen line. In 80-column mode, you can use the
standard graphic characters and colors available through the
keyboard.
You can also write programs using two monitors to take advantage
of both screen display formats with each monitor screen performing
different aspects of the program. For example, text output could be
displayed on the 80-column monitor while graphics output could be
seen on the 40-column monitor.
You can use the 40/80 key to set the screen width as either 40 or 80
columns. Pressing this key will only have an effect when one of the
following actions is taken:
1. Power is turned ON.
2. The RESET button is pressed.
3. The RUN/STOP and RESTORE keys are pressed simultane
ously.
The 40/80 key acts like a SHIFT/LOCK key: it locks when you press it,
and does not release until you press it again. If this key is up (not
pressed) when one of the three conditions above occurs, the screen
is set to 40 columns. If before power-up you press the key down,
causing it to lock, and one of the three conditions listed-above then
occurs, the screen is set to 80 columns. Once the computer is run
ning in one screen format (40 or 80 columns), you cannot switch to
the other format using the 40/80 key. In this case you must press and
release the ESC key and then press the X key.
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USING C128 MODE-Using 80 Columns