Sharp MZ-800 User Manual

3.4 Editing Programs
The BASIC interpreter makes it possible for you to edit a program which is in memory. Therefore,
if you type in any incorrect character during programming, you can correct it easily.
You can edit any portion of a program when that part of the program is displayed on the screen. The
program can be displayed by the LIST command. The cursor can be moved in any direction by the
cursor control keys (marked with arrows) you can change or delete the character in the same location
as the cursor, or insert characters before the character in the same location as the cursor.
The keys which allow you to edit programs are as follows.
: Moves the cursor one character position right.
Moves the cursor one character position left.
t Moves the cursor one line up.
+__| : Moves the cursor one line down.
INST | : Moves the character on which the cursor is located and all characters following it on the same
line to the right by one character position, and inserts a space at the cursor position. This
makes it possible to insert any character at the cursor position. To insert more than one charac-
ter, press the |INST | key the required number of times.
If the end of a program line reaches the right end of the display while inserting blanks with
the [INST] key, you cannot insert any more blanks. In this case, press the [CR] key and
execute the LIST command. The new program listing will include a row of blanks following
the line, allowing you to insert more blanks.
DEL | : Deletes the character at the location to the left of the cursor position and moves all characters
following it on the same line to the left by one character position.
(CLR)
lears the screen. (‘*|SHIFT| + |INST|’’ is another way of saying ‘‘press and hold the
key, then press the | INST key’’.)
SHIFT (HOME)
: Moves the cursor to the upper left corner of the screen.
Type in again the program shown in Section 3.3, but with the following intentional mistakes:
10 CLS
20 PRINT “‘SIMPLE PROGRAM"
30 PINTT ‘‘MZ-800"
40 END
To edit and correct the above program, the program must be listed on the screen. To do this, execute
the LIST command.
(1) Replacing a letter
SIMPLE on line 20 should read SAMPLE. Move the cursor to the position of character I by using
the cursor control keys, then press the |A| key. After changing I to A, press the key, and the
cursor will be returned to the beginning of line 30.
(2) Inserting a letter
Move the cursor to I in PINTT and press the | INST | key. Press the [R] key to insert R between the
characters P and I.
(3) Deleting a letter
Move the cursor to the second T in PRINTT and press the [DEL] key to delete it.
Press the |CR| key, and the cursor will move to the beginning of line 40.
3-7

Sharp MZ-800 Specifications

General

Brand	Sharp
Model	MZ-800
Category	Desktop
Language	English