Epson LX-90 User Manual - Apple IIc 8699 PIC for LX-90 - Page 52

lines. For the arrow design, the grid was divided into three lines, each

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In this figure you can see the main rules for graphic design in the three densities. In single density no dots can be placed on vertical lines. In high-speed double density, dots can be placed on vertical lines, but no dots can overlap. In low-speed double density, dots can be placed on vertical lines and they can overlap. Now look at the figure designed for high-speed double density. It should point you in the right direction for your own designs. Figure 7-4. Arrow design After plotting all the dots as in Figure 7-4, you calculate the numbers for each pin pattern by dividing the design grid into separate print lines. For the arrow design, the grid was divided into three lines, each seven dots high. Then each column was examined and the sums of the pin values determined. This process for the first line is shown in Figure 7-5. The pin values are on the left side and the sums are at the bottom of each column. 50

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In this figure you can see the main rules for graphic design in the
three densities. In single density no dots can be placed on vertical
lines. In high-speed double density, dots can be placed on vertical
lines, but no dots can overlap. In low-speed double density, dots can
be placed on vertical lines and they can overlap.
Now look at the figure designed for high-speed double density. It
should point you in the right direction for your own designs.
Figure 7-4. Arrow design
After plotting all the dots as in Figure 7-4, you calculate the num-
bers for each pin pattern by dividing the design grid into separate print
lines. For the arrow design, the grid was divided into three lines, each
seven dots high. Then each column was examined and the sums of the
pin values determined. This process for the first line is shown in Figure
7-5. The pin values are on the left side and the sums are at the bottom
of each column.
50