Terminal Control
Memory Lock Mode
Memory Lock mode provides two separate functions: overflow protect
and
display lock.
OVERFLOW
PROTECT.
If
you home
the
cursor
and
then
enable
Memory Lock mode,
the
workspace becomes ((protected"
so
that
no
data
can be lost off
the
top.
In
such a case,
when
you
have
used all available lines
in
the
workspace, any
attempt
to use more memory
is
rejected
with
an
audible «beep"
and
the
message
MEMORY
FULL is displayed.
You
may, however, use
the
cursor control keys to
go
back
and
alter
any
of
the
existing
data.
To
continue
entering
new
data,
merely disable Memory Lock mode and reposition
the
cursor
immediately
below
the
last
line. Before doing
so
you may wish to enable
((log
top"
data
logging (described
in
Section 6
and
Appendix
C)
so
that
data
that
is
then
forced off
the
top of
the
workspace will be
retained
in
printed
form.
DISPLAY LOCK.
If
you position
the
cursor below
the
top line of
the
screen
and
then
enable
Memory Lock mode,
the
lines above
the
cursor line become (locked" on
the
screen. As
the
screen becomes full,
the
locked lines
remain
on
the
screen while subsequent lines roll
past
the
locked rows. This allows you to
retain
column headings or
instructions
on
the
screen
as
you
continue to
enter
new
data.
It
also provides a useful
means
ofchanging
the
sequence of
text
blocks
as
follows:
a.
Press.,
.,
and
then
type
the
following data:
3. This is
paragraph
3.
It
should be
the
third
one.
1.
This
is
paragraph
1.
It
should be
the
first one.
2.
This
is
paragraph
2.
It
should be
the
second one.
4.
This
is
paragraph
4.
It
should be
the
last
one.
b. Position
the
cursor
in
the
first line of
paragraph
1.
c.
Enable
Memory Lock mode.
d. Use
the
_ key
until
the
first line of
paragraph
4 is
in
the
same
line
as
the
cursor.
2-6
'\
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