Radio Shack PC-2 TRS-80 Owner's Manual page 71

GPR INT can set or reset any dot (or pattern of dots) within the columns on the Display. For example, GPR INT
o
will turn all dots in a column off; GPRINT 127 (or GPRINT "7F") will turn all dots in a column on.
To specify which column, use GCURSOR. Then use GPR INT to turn any combination of dots in that column on
or off.
For instance, (in the RUN Mode) type:
This will tell the PC-2 to use column 75. Then type:
and a solid line will appear near the center of the Display.
Press
(ENTER)
and type:
and aga in ty pe :
This time the solid line will appear at the right side of the Display.
In both instances, the line pattern (all dots turned on) is the same but the lines are displayed in different positions.
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