Commodore Plus 4 - PROGRAMMABLE FUNCTION KEYS

BASIC Version 3.5 Commands, Functions, and System Variables
40 PRINT* 4:CL0SE 4 Turns off the CMD command
and closes access to the printer.
The following sequence can be used in immediate mode to LIST the current
program to the printer:
0PEH4,4:CMD4:LIST
PRINT#4:CL0SE4
COLLECT Abbr. colL
COLLECT Ddrive, ON Uunit
Cleans up a disk by clearing files that were improperly closed and are inacces
sible. COLLECT removes improperly closed files from a disk and its directory so
you can store files in disk space that was rendered unusable.
Note: Never use the COLLECT command on disks that contain information
written with direct-access commands (see Chapter 6).
Parameters: drive number, U unit number
1. Drive numbers are either 0 or 1. No other numbers are allowed.
2. Unit number is an optional parameter. Use it only if you have more than one
disk drive connected to your computer, and you are using a device other than unit
8 in the COLLECT procedure. You must precede the unit number with U, and the
unit
number must be between 8 and 11. You can type ON before U, but ON is not
required.
Note: The drive and unit number parameters can be specified with a variable
or expression in parentheses.
Example: COLLECT DO Gets rid of all inaccessible files on drive 0.
COLOR Abbr. coL
COLOR color source, color, luminance
Lets you change the color of the screen, the characters, the border, and the
multicolor sources. You can choose any of the 16 basic colors, and one of 8 shades
of any color except black, which has no shades.
The COLOR command lets you indirectly choose the color to be used in
drawing commands. Drawing commands such as CIRCLE do not have parame
ters for selecting color. You must first change the color with a COLOR command.
You can change character color with the color keys on the keyboard, which are
pressed with the Q or CONTROL keys. This method of selecting a character
color has two shortcomings: you cannot select a luminance level, and the color
change does not affect the value in the foreground-color source (source 1). This