Radio Shack TRS-80 - Chapter 8: Calculator Mode; The Calculator Mode

Computer Graphics Operation Manual
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8 x 8 grid
~
~ ~
1 1
~ ~ ~
~
~ ~
1
1
~
~
~
~ ~ ~
1 1
~
~
~
1
1 1 1
1 1 1 1
1 1 1 1
1
1 1 1
~
~ ~
1
1
~ ~
~
~
~
~
1
1
~
~ ~
~
~ ~
1
1
~ ~ ~
Binary
Hex
~~~l l~~~
18
~~~l l~~~
18
~~~l l~~~
18
1111 1111
FF
1111 1111
FF
~~~l l~~~
18
~~~l 1~~~
18
~~~l l~~~
18
Figure 15
Tile string:
A$=CHR$(&H18)+CHR$(&H1S)+CHR$(&H1S)+CHR$(&HFF)+CHR$(&HFF)
+CHR$(&H1S)+CHR$(&H1S)+CHR$(&H1S)
b
Border
Border is the OFF/ON color of the border of a graphics
design where painting is to stop and is a numeric expression
of either ~ or 1. If omitted, 1 (ON) is used and all the
pixels on the border are set (solid white).
background
Background Area
Background is a l-byte character which describes the
background of the area you are painting. CHR$(&H~~)
specifies a black background and CHR$(&HFF) is a totally
white background. If background is not specified, BASICG
uses CHR$(&H~~).
Painting continues until a border is reached or until PAINT
does not alter the state of any pixels in a row. However, if
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