Radio Shack 26-1190A Hardware Manual page 13

Plotter printer. trs-80 micro computer system
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Plotter
Mode
(P
Mode)
In
the
Plotter
mode,
the printing position
is
determined
by
a
system of
coordinate
values.
If
a
command
tells
the
pen
to
move
to
a
point off the
paper, the
pen
will
remain
stationary
at
the paper's edge,
but
the
pen's
imaginary
position off the
paper
will
be kept
internally
and
the
next
move
or
print
will start
at
that
imaginary
position.
Absolute Coordinate
System
The
coordinate axes
are
defined
with
respect to the
paper
as
follows:
Paper feeding
direction
O
O
O
O
O
O
O
O
+Y
i
•+X
When
the
mode
is
set
to
P
Mode
the reference point for the absolute coordinate
system
is
as
follows
if
the
POSITION
switch
is
not
used.
Current
position of
pen>
Approx.
21
mm
+Y
O
<0,0)
-+X
Effective
paper width
O
O
o
o
The
zero-point
of
the
X
axis
(X=0)
is
defined
as
the
left
margin.
The
zero-point
of
the
Y
axis
(Y=0)
is
defined
as
the current
pen
position.
-12-

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