OPERATiON
Reverse field
characters
Many
ot the reverse
fieid
characters,
by their
structure, have
an open
top. For characters
which
have
a bar at the
top
e.g.
E.F.T
this is
panicuiarly
noticeable.
A
more
pleasing appearance
may
be
given
to
such
a
character
by printing
a reverse
fieid
top character (ASCII
59}
directly
above
it.
ForexamplethereversefieldEsentby:-
'*WRlG.I5e“'
is improved
by adding:-
•’VVR2U.!4“:CHRS(59)
Worksheet
Fig.
3”
1 8 is
provided
as a worksheet
for
defining
the
screen
addresses and plotting the
screen
layout.
Graticule
characters
,,
Some
caution is
required in
the
use of characters
128 to 191
since
these are
used
to
form the
oscilloscope
graticule.
When
the
instrument
recognizes
a graticule
character it
also
switches
on the
oscilloscope
trace
for the
duration
of that character.
This
may
cause
strange
affects
when these
characters
arc
used
to form
a
user-defined
display.
Because of the
method of triggering, no trace
will
be observed
as long
a.s
these
characters
are not
used
in a
vertical
sequence (the screen is scanned
Irom
top to
‘bottom
).
This
means
that,
for instance, horizontal lines of these characters may be
drawn
as long
as they
arc
staggered
l.e.
chequerboard or alternate lines.
To
detect
the
presence,
or otherwise,
of
the trace
in a user-defined display,
check
for
any
movement
in
the display while
adjusting
the
oscilloscope
POSITION
controls.
46831
-622N
Apr.
83 3-55
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