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THE LCD SCREEN
The PRECOMPUTER POWER PAD™ PLUS learning unit uses a Liquid Crystal
Display (LCD) screen. Each line will display 20 characters at a time. The Left Arrow
key and Right Arrow key are used to scroll the 20 character display window left or
right, respectively.
In BASIC, pressing the ENTER key allows you to see the next printed statement
that your program is displaying. You need to do this so the output doesn’t scroll
off the end of the line.
GETTING STARTED
This activity lets you type in your own programs and run them. Follow these simple steps:
1) Turn on PRECOMPUTER POWER PAD™ PLUS.
2) Choose the BASIC activity from the Membrane Activity Selector.
There are two modes available; Command and Run.
Type in this program:
10 PRINT “HI THERE” press ENTER
This is a simple way of writing a program. Type in the program lines and remember to
press the ENTER key. Each line starts with a number and is followed by a statement.
PRECOMPUTER POWER PAD™ PLUS stores the line with the other lines into memory.
Later you can execute the program by typing the command, RUN. Remember to press
the ENTER key after typing RUN. The results appearing on the LCD screen are: HI THERE.
There is a short cut.
Enter the following (no line number in front):
PRINT “HI THERE” press ENTER
This time PRINT was used as a command and the results appeared immediately on the
display after the ENTER key was pressed. The computer executes the command right
away, without waiting for you to type RUN. When you do this, the statements are not
saved for future re-use. They are executed immediately and discarded. This is not
recommended for creating programs but highly recommended for use as a calculator.
The following are some additional commands to be used:
NEW
This command clears the memory of any BASIC statements that have been previously
entered.
LIST
This command displays each line of your program starting with the lowest line number.
Each time you press ENTER, the next lines are displayed. You can stop this by pressing
the SHIFT and BREAK keys. If you enter the command with a line number after the word,
i.e., LIST 50, PRECOMPUTER POWER PAD™ PLUS will list the statement at line 50.