If
you
have the MZ-731
(or
a separate plotter-printer), now
try
appending the characters
1/PJ
to
the
end
of
the word PRINT.
This time nothing appears on the display screen,
but
the same result
is
printed
out
on
the
plotter-printer.
In
other
words, the I
/PJ
symbols switch
output
from
the
display to the plotter-printer:
This completes
our
explanation
of
procedures for using the MZ-700
as
you
would a
pocket
calculator.
Note: PRINT
11
5 + 8 =
11
; 5 + 8 displays 5 + 8 = 13, while PRINT
11
5 - 8 =
11
;
5-
8 displays
5-
8 =
-3
.
The reason for this
is
that
o·ne space
is
always reserved for a symbol indicating whether
the
result
is
positive
or
negative,
but
the
symbol
is
only displayed in
that
space when the result
is
negative.
2.1.2 Programming
Let's
try
making a simple program. However, first let's make sure
that
the area in the computer's
memory which
is
used for storing programs
is
completely empty. Do this by typing in
NEW
and pressing
theiCRikey. (This instruction will be explained in more detail later; see page 32.)
Type in the following program exactly
as
shown.
1
0
A=31CRI
...
..
....
.
...
.
.......
Assigns the value 3
to
A.
20
8=61
CRI
....
. .
...
. . .
...
. . .
...
Assigns the value 6
to
B.
30
C=A+BICRI
. . . .
.....
...
. .
....
Assigns
the
result
of
A+
B to
C.
40
9 CICRI
............
.
..
.
...
. . Displays the value assigned
to
C.
· 5 0
END
le
RI
. . . . . . . . . . . . . . . . . . . . . Instruction indicating the end
of
the program.
The numbers
10, 20, 30, and so forth at the left end
of
each line are referred
to
as
program line numbers,
or
simply line numbers; these numbers indicate the order in which instructions are
to
be executed
by
the
computer. Instructions
on
the lowest numbered line are executed first, followed
by
those
on
the
next
lowest numbered line, and so forth. Line numbers must be integers in the range from 1
to
65535.
The line numbers
1,
2,
3, and
so
forth could have been used in this program instead
of
10, 20, 30.
However,
it
is
common practice
to
assign line numbers in increments
of
10
to
provide room for later
insertion
of
other
lines.
Now let's check whether the lines have been correctly entered. Type in LIST and press the
I
CRI
key;
this causes a list
of
the program lines
to
be displayed. Notice
that
the question mark entered at the beginn-
ing
of
line
40
has been converted to PRINT, the full form
of
the command for displaying
data
on the
display screen.
18--------------------
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