Commodore Plus 4 - CHAPTER 2 Using the Keyboard and Screen

BASIC Version 3.5 Commands, Functions, and System Variables 17
BACKUP DO TO Dl, U9 Copies the disk in drive 0 of unit 9 onto the disk
in drive 1 of unit 9.
BOX Abbr.bO
BOX color source, corner coordinate, corner coordinate, angle, fill
Draws a rectangular shape in any of the four graphic drawing modes. You
supply the column, row coordinates of two opposite corners. You can include a
parameter to draw the rectangle at a tilted angle, and you can draw the box as an
outline or as a solid shape.
BOX can be executed only in a graphic mode. For more information on the
graphic modes and on the coordinates for the BOX command, see Chapter 4.
Parameter
Values
Default
Color source
First corner coordinate
Column coordinate
Row coordinate
Second corner coordinate
Column Coordinate
Row coordinate
Angle
Fill
0-3
0-319 (high-res modes)
0-159 (multicolor modes)
0-199
0-319 (high-res modes)
0-159 (multicolor modes)
0-199
0-360
0 (outline) or 1 (solid)
1
pixel cursor
0 (no angle)
0
1. The color source indirectly selects the color for the drawing. There are five
color sources, but color source 4 (the border color) cannot be used in drawing
commands. Color sources 2 and 3 can be used only in multicolor modes.
0 screen background color
1 foreground color
2 multicolor mode extra color 1
3 multicolor mode extra color 2
The color source number you include in the BOX command tells the computer
to draw in the current color for that source. For example, if you select 1, the
computer draws the box in the current foreground color. If you want to use a
color other than one of the current source values, you must first use the COLOR
command to change one of the source values. Only sources 1 and 2 can be used to