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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 of changing 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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