Graphics

In the figure on the previous page, you can see the main rules for graphics design in the three densities:

•In single-density, no dots can be placed on vertical lines.

•In double-density, dots can be placed on vertical lines, and they c a n o v e r l a p .

•In high-speed double-density, dots can be placed on vertical lines, but no dots can overlap.

After choosing the desired density, you design your fiie by plotting dots on graph paper.

The high-speed double-density design shown below should point you in the right direction for your own work.

After plotting the <dots on a g&l, you calculate thenumbers for each pin pattern by dividing the design grid into separate print lines. For the arrow design, the grid was divided into two lines, each seven dots high. Then each column was examined to calculate the graphics data. The results for the first line are shown in the figure on the next page. The pin values are on the left and the sums at the bottom of each column.

4-18Software and Graphics