Commodore Plus 4 - THE HELP KEY

BASIC Version 3.5 Commands, Functions, and System Variables 27
The luminance setting is optional. The default value is 7, which selects the
brightest shade of the color. When you use the color keys on the keyboard to
change the character color, a preset luminance value is automatically used.
Black has no luminance values, although it is not an error to include this
parameter when you are selecting black. The luminance settings 0 through 6 for
white are shades of gray.
Examples: COLOR 0,12, 3 Changes the screen background to medium pink.
COLOR 1, 3, 0 Changes the foreground color to dark red.
CONT Abbr. cO
Lets you restart a BASIC program after you have interrupted its execution
with the STOP key, the STOP command, or an END command in a program.
The program resumes at the point in the program where execution was inter
rupted, and all variables retain their most-recent values.
You cannot resume execution with CONT if any of the following events have
occurred between STOP and CONT:
• You change or add lines to the program.
• You move the cursor to a program line and press RETURN with or without
changing the line.
• The program stopped because of an error (in which case an error message
would have appeared on the screen).
• You do anything to cause an error after suspending the program.
• You execute a CLR command.
COPY Abbr.coP
COPY Ddrive, old file name TO Ddrive, new file name, ON Uunit
Makes a duplicate of a disk file or an entire disk. On a single disk drive, such as
the 1541, you can copy a file only onto the same disk. You must give a copy on the
same disk a different name from the original file. The COPY procedure does not
affect the master file. In addition, you can copy from one drive to another if you
have a dual disk drive. You cannot use the COPY command to copy from one
single disk drive to another with different unit (device) numbers.
Unlike the BACKUP command, COPY does not header the recipient disk
before duplicating the file(s). The advantage of this difference is that you can use
COPY to add files to a disk that already contains files you want to keep. The only
drawback is that you must take care not to COPY a group of files onto a disk that
does not have enough room. Avoid this problem by checking the directories of
both disks before you issue the COPY command. A 1541 disk can hold up to 664
blocks (256 bytes each) of information.