Casio FX-890P Owner's Manual page 30

Again, the . . key must be pressed to store the corrected line into memory after
changes are made.
Changes within a program already input
The LIST command displays the program stored in the current program area form
beginning to end.
Shift LIST . .
The last line of the program is displayed when the LIST operation is complete.
.. .. .. .. .. ..
The 8-line virtual screen of the computer now makes it possible to use the cursor
keys to scroll to preceding lines not shown on the display.
When a program greater than eight lines is stored in memory, the LIST operation
should be performed by specifying the line numbers to be displayed.
EXAMPLE:
Displaying from line 110 to line 160 on the virtual screen.
Shift LIST 110 - 160 .
Note: The BRK key can be used to terminate the LIST operation. The Shift STOP
key suspends the operation, and listing can be resumed by pressing .
Changes within a program following the EDIT command
The EDIT command makes it easier to edit or review programs already stored in
memory.
Shift EDIT . .
From the display,
returns to the previous line.
.
CAPS .
S
BASIC . 
DEG .
RAD
GRA
.. (or . .) advances to the following line, while
10 REM CYLINDER
20 R=15
30 INPUT "H=";H
40 V=PI*R^2*H
40 V=PI*R^2*H
50 PRINT "V=";V
60 END
Ready P0_
10 REM CYLINDER
20 R=15
30 INPUT "H=";H
40 V=PI*R^2*H
10 REM CYLINDER
.
20 R=15
30 INPUT "H=";H
.
40 V=PI+R^2*H
.
30
...
. .
.. (or Shift . .)