SB-10 USER'S MANUAL

590 DATA 64,64,128,128,0,0,0,0,~,~
600 DATA O,O,O,O,O,O,O,O,O,O
SMILE
Figure F-9. Picture of a smile.
The data lines of our program (lines 130-600) correspond to the
eight horizontal sections of the graph. In each line, we have entered
the pin firing values calculated from the information drawn on the
graph. The program used to create a picture from this data is actually
quite simple. Please follow along for a brief explanation of how it
works:
LINE 20
In this statement, we enter the codes to change line
spacing to 10/120ths of an inch. This causes the lines
to just slightly touch each other, but not to overlap.
You can experiment with line spacing in your
graphics, but in general, overlapping lines will cause
your picture to be distorted. On the other hand, if the
line spacing is too wide, your image will have unwanted
“gaps” in it. To adjust the line spacing in your
graphic image, just enter a different value in n/l20ths
of an inch: a higher value for wider spacing, or a lower
value for narrower spacing.
LINE 30
LINE 40
LINE 50
LINE 60
In this statement, we set up the number of rows to
print-in our example, eight-by using the BASIC
“for/next” loop.
Now we’re ready to enter the code to set up the
graphics mode we want to use. The < ESC > “Y” sets
up 8-bit graphics, and the “60” and “0” are thevalues
of n7 and n2, respectively.
This statement sets up the number of dot columns that
will be contained in the image, by using a BASIC
“nested” for/next loop.
Reads the data for a single column.
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