AT&T 6300 Programmer's Manual page 201

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Erases all or part of the screen.

is an integer expression in the range 0 to 2.

CLS without a parameter clears the entire

screen to the current text background color,

unless a graphics viewport has been defined,

and resets the function key line (if the function

key display is enabled). If a viewport has been

defined, the current viewport only will be

cleared to the graphics background color.

Outputting a formfeed character (typing

CTRL L or PRINT CHR$(12);, will have the

same effect).

CLS 0 clears the entire screen, resetting the

function key display.

CLS 1 clears the graphics viewport to the

graphics background color (in one of the

graphics modes). If no viewport has been

defined, this will have no effect.

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