again. Finally line 110 sends a form feed to advance the paper
to the top of a new page, and then uses the master reset to restore
SG-lo/15 to the power-on condition.
You can also set SG-IO/l5 to print in one direction for one
line only by using the command < ESC > “ < “. This command
immediately moves the printhead to the left margin and then
prints the remainder of the line from left to right.
n The seven bit dilemma
Certain computers (most notably the Apple II) don’t have the
capability to send eight bits on their parallel interface. They can
only send seven bits. This would make it impossible for these
computers to use SG- lo/ 15’s block graphics characters and special
symbols if Star’s engineers hadn’t thought of a solution. (All of
these characters have ASCII codes greater than 127 which means
that the eighth bit must be on to use them.) The solution lies
in the three control codes given in the following table.
Table 84
Eight bit control commands
Accept the eighth bit “as is”
STAR 1 < ESC > “##”
from the computer
IBM 1
<ESC> “#f”
72
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