Introduction; The 40 /8 0 Key - Commodore 128 System Manual

INTRODUCTION

ln C128 and CP/M modes, you can choose between a 40- and
80-column screen display. You could 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 80-columns, you get twice the number of
characters per program line, ln 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.
THE 4 0 /8 0 KEY
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
simultaneously.
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 running in one screen format (40 or 80 columns),
you cannot switch to the other format using the 40/80 key. ln this
case you must press and release the ESC key and then press the
X key.
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