Radio Shack TRS-80 Operation Manual page 79

Computer Graphics Operation Manual
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LINEB
Draws Box
LINEB is the same as LINE except LINEB draws a box between
the two sets of coordinates set by the SETXY or SETXYR
subroutines.
Example
CALL LINEB (1,-1)
Sample Program (see LINE)
LINEBF
Draws Painted Box
LINEBF is the same as LINEB except LINEBF fills the box
(colors in the box) and the argument style is not used.
Example
CALL LINEBF (1)
Sample Program (see LINE)
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