A test print will occur in the "Special" switch setting of a LaserWriter or
LaserWriter Plus, contrary to some sources, such as page 130 of the manual for
the LaserWriter and LaserWriter Plus.
The line graph on the test print shows two tick marks on the x-axis. These
tick marks indicate Special mode. The bar graph on the test print shows which
port is active at which baud rate. For example, if the 25-pin port is active
at 9600 baud, then above the number 25 on the graph's x-axis, there is a bar
extending up to the number 9600 on the y-axis.