All and more about Sharp
PC
-1500 at http
:/l
www.PC-1500.info
A. ON
AND
OFF
KEY
S
Obviously these
key
s
turn
the
power
on
and
off.
SHARP, to conserve
it.s
ba11ery, will auto·
matically
shut
off
ii nothing
is
keyed in for a
per
i
od
of
about
seven minutes. unless a program
is
being executed. Observe inscribed above the l
oN
I k
ey
the
phrase BREAK. The I ONI key can be
used
lo
BREAK.
or
interrupt, the execution of a program. This function is described in more detail
later
in
th
is manual .
B. ALPHABETllC KEYS
The Alphabetic keys allow tho computer user (you) to
gi
ve instructions and
enter
data
.
In
add
i·
tion. these
keys
may
be
us
ed
to
designate "storage areas" v1ithin
the
co
mp
ute
r"s memory into
and
from
which
you
\•1
ill be
abl
e
to
save
or
retrieve
data.
Th
is
use
will
be
covered
in
the
sec
tion
on
variables. Lower case letters a
rc
available through the
u~
of
the
f
SHon
f
and
~
Q
(S
MA
LL)
keys (described
below).
C. NUMERIC KEYS
and
ARITHMETIC OPERATION KEYS
With these you enter numbers for
ca
lculation.
Th
e
CEJ
,
l-1
.
00
,
and
f7J keys tell
SHARP to add,
subtr
act, multiply and divide. respectively. The
[]]
key allows the entry
of
numbers
in
"scientific
notation".
The
use
of
th
is
notati
on
and o
th
er
sophi
st
icated functions are
described in
the
cha
pter
on
Advanced Calculations.
D.
SH
IFT
This key delivers
the
secondary
fu
nction.s i
ns
cribed above many non·alpha
be
tic keys. F
or
instance,
to
type a colon, press '
'"
'"
' and then
th
e
00
(asterisk I key. When
th
e
SH
I
FT
key
is
followed by an
alp
habetic key, the lower-case
letter
is
displayed. (NOTE: In the SMALL mode,
the SHIFT proceedi
ng
the alphabetic key will
produc
e
an
upper.case l
ette
r)
.
When
the
SHIFT
key
is
ac
tiv
ate
d.
the word SHIFT appears in
th
e upper left corner of the
display.
Th
e shi
ft
mode is
only
active for
one
keyst roke
at
a
ti
me
.
The
si
x keys at tho
top
of
the keyboa
rd
, directly below the display win
dow,
a
re
called
RESERVABLE KEYS. Using
the
shift in a mann
er
we
wi
ll
decribe l
ate
r
on
,
you
can assign
frequently typed
comma
n
ds
or
other
operations
to
these keys.
NOTE:
II
you
press
the
I
SMonl
k
ey
by
mista
ke
, press it again
to
cancel.
E. LOWER-CASE LETTERS
and
the
SMALL
KEY
The
~
key nllows you
to
speci
fy
lower case for
all
alphabetic keys.
If
you
do
not
specify
the S
MAL
L mode, SHARP will sel
ect
upp
er·case
for
you each time you prnss an alphabetic key.
(Wn
ca
ll
th
is
the
"d
efa
ul
t"
mode, moaning
the
way
in which the machine operates unless you tell
it o
therwise
.)
You
can
type
i
ndi
vidual
lower-
c
ase
letters by
press
ing
the
l
5't•n
l key
before
the
le
tter
.
The
~
key may
be
used
to
effect
the
SMALL mode.
In
SMALL mode lowercase letters
result
from pressing
an
alphabetic
key
and
indivi
dua
l
up
per-case letters are displayed by pressing
the '
'"'"
'
key
first. When
the
computer
is in SMALL mode, tho word SMALL
will
appear
on
the
top
port
i
on
of the display window. Once
you
have placed the computer in SMALL mode, it will
remain in this
mode
u
nt
il you press
the
~
k
ey
again.
NOTE:
We
recommend t
hat
you restri
ct
your use of lower.case f
or
the
moment. Th
is
is
because
SHARP
on
ly recognizes instructions in upper-case letters. When you learn to program. y
ou
wil
l find lower-case letters handy.
12
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