On And Off Keys; Alphabetic Keys; Numeri C Keys And Arithmetic Operation Keys; Shift - Sharp PC-1500 Instruction Manual

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A. ON AND OFF KEYS
Obviously these keys turn the power on and off. SHARP, to conserve it.s ba11ery, will auto·
matically shut off ii nothing is keyed in for a period of about seven minutes. unless a program is
being executed. Observe inscribed above the loN I key the phrase BREAK. The I ONI key can
be
used
lo
BREAK. or interrupt, the execution of a program. This function is descr ibed in more detail
lat er in th is manual .
B. ALPHABET l l C KEYS
The Alphabetic keys allow tho computer user (you) to give instructions and enter data. In addi·
tion. these keys may be used to designate "storage areas" v1ithin the
computer"s
memory into
and from which y ou \•1ill be able to save or retrieve data. This use will
be
covered in the section
on variables. Lower case letters arc available through the
u~
of the fSHon f and
~Q
(SMALL)
keys (described below).
C. NUMERIC KEYS and ARITHMETIC OPERATION KEYS
With these you enter numbers for calculation. The
CEJ ,
l-1 . 00 ,
and
f7J
keys tell
SHARP to add, subtract, multiply and divide. respectively. The []] key allows the entry of
numbers in "scientific notation". The use of this notation and o ther sophisticated functio ns are
described in the chapter on Advanced Calculations.
D. SHI FT
This key delivers the secondary fu nction. s inscribed above many non·alphabetic keys. For
instance, to type a colon, press ' '"'" ' and then the
00
(asterisk
I
key. When the SH IFT key is
followed by an alphabetic key, the lower-case letter is displayed. (NOTE: In the SMAL L mode,
the SHIFT proceeding the alphabetic key will produce
an
upper.case letter) .
When the SHIFT key is activated. the word SH IFT appears in the upper left corner
of
the
display. The shift mode is only active for one keyst roke at
a
ti me.
The six keys a t tho top of the keyboard, directly below the display window, are called
RESERVABLE KEYS. Using the shift in a manner we wi ll decribe later on, you can assign
frequently typed commands
or
other operations to these keys.
NOTE: II you press the ISMonl key by mistake, 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 SMALL mode, SHARP will select upper·case for you each time you prnss an alphabetic key.
(Wn call this the "defaul t" mode, moaning the way in which the machine operates unless you tell
it
otherwise.) You can type individual lower-case
letters by
pressing the l 5't•n l
key
before
the
letter.
The
~
key may
be
used to effect the SMALL mode. In SMALL mode lowercase letters
result from pressing an alphabetic key and individual upper-case letters are displayed by pressing
the ' '"'" ' key first. When the computer is in SMALL mode, tho word SMALL
will
appear on the
top portion of the display window. Once you have placed the computer in SMALL mode, it will
remain in this mode until yo u press the
~
key again.
NOTE: We recommend that you restr ict your use of lower.case for the moment. This is because
SHARP only recognizes instructions in upper-case letters. When you learn t o program. you
wil l find lower-case letters handy.
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