Specifications

How to Select an
Operating Mode
Each of the three operating modes of the Commodore 128—C128,
C64 and CP/M—takes advantage of particular hardware and soft
ware features. Two modes—C128 and CP/M—allow you to use both
40- and 80-column screen displays. In effect, then, the Commodore
128 lets you.select any of the following five operating options:
• C128—40 Columns
• C128—80 Columns
• C64—40 Columns
• CP/M—80 Columns
• CP/M—40 Columns
If you are using a composite monitor or a TV set for your display, you
can access only the 40- column options. If you are using an RGBI
monitor you can access only the 80-column options.
If you are using a dual monitor like the Commodore 1902, you can
access all five options. You can also use iwo separate monitors (one
composite, and one RGBI) to access all five options. With a dual
monitor or with separate composite and RGBI monitors, you can
switch from option to option as desired. This section briefly
describes each mode and shows you how to switch from one mode
to another.
T inc
NOTE: When you change modes, the information you are work
ing with in a given mode is not transferred to the mode you
change to. If you want to keep that information you should SAVE
it before changing modes. See page 29 for instructions on
SAVEing information.
C128 Mode
C128 mode is the default mode for your computer at power-up. This
means that if you don't specifically select C64 or CP/M mode, and if
all disk drive equipment is OFF, you wiil be in C128 mode when you
turn on the computer.
Entering C128 Mode—40 Columns—with the Computer
OFF
1. Make sure computer 40/80 key is not depressed.
2. Check that CP/M disk is not in the disk drive.
3. If you are using a 1902 dual monitor, make sure it is set to
separated chroma/luma.
4. Press computer ON/OFF switch.
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