TM 5-6675-321-14
One function is indicated by the symbol on the flat surface of the key, a second by
the symbol on the slanted key face,
and a third by the symbol written above the key
on the calculator case.
Function printed on the flat face of the key is selected by
p r e s s i n g t h e k e y.
Function printed above the key is selected by first pressing
prefix key and then the function key.
The function printed on the slanted face
o f t h e k e y i s s e l e c t e d b y f i r s t p r e s s i n g p r e f i x k e y a n d t h e n t h e f u n c t i o n k e y .
DISPLAY.
The display is the X-register of the automatic memory stack and provides a
visual readout of latest numeric entry, operation result, or error messages.
MEMORY. Memory is divided into two parts;
storage registers and automatic memory
s t a c k.
a .
Storage registers.
S t o r a g e r e g i s t e r s a r e u s e d t o s e t a s i d e n u m b e r s f o r
recall in later calculations. N u m b e r s a r e s t o r e d b y f i r s t p r e s s i n g f o l l o w e d
by a number 0 thru 8 or a decimal point and a number 0 thru 5 . The number in
displayed X-register is then copied into the selected register. Recalling a number
is accomplished by first pressing followed by a number 0 thru 8 or a decimal
point and a number thru .
The number that is in the selected register will be
copied into the displayed X-register without any change to contents of that regi-
s t e r .
Storage
registers
R.Q
t h r o u g h R.5 a r e u s e d f o r a c c u m u l a t i o n o f s t a t i s t i c al
data.
Turning
calculator
off
will
clear
(place
zeros
in)
all
storage
registers.
b.
Automatic memory stack.
The automatic memory stack is used to store
i n t e r m e d i a t e r e s u l t s d u r i n g c a l c u l a t i o n s.
The stack consists of four registers
designated X, Y, Z and T.
The contents of X-register are constantly shown on the
c a l c u l a t o r d i s p l a y.
Numbers are manually entered into the memory stack by pressing
. D u r i n g c h a i n c a l c u l a t i o n s ( l o n g e q u a t i o n s ) , i n t e r m e d i a t e a n s w e r s a re
automatically entered in the memory stack.
Each new entry into the stack is first
entered in the X-register and, with each additional entry, the stack rolls up one
a n d t h e c o n t e n t s t h a t w e r e i n t h e T - r e g i s t e r b e f o r e r o l l - u p , a r e l o s t . T h e c o n t e n t s
of the stack can be viewed by pressing
key four times .
The contents of T
register are not lost because the stack forms a continuous loop, i.e., the contents
o f T - r e g i s t e r a r e s h i f t e d t o t h e Z - r e g i s t e r ; Z - r e g i s t e r t o Y - r e g i s t e r ; Y - r e g i s t e r t o
X - r e g i s t e r;
a n d X - r e g i s t e r t o T - r e g i s t e r.
With intermediate answers stored in the
stack, operations can be performed with these numbers by pressing the key of the
desired operation.
Example:
To calculate (3 x 5) + 2, press:
( 3 e n t e r s X - r e g i s t e r . )
( 3 i s c o p i e d t o Y - r e g i s t e r .)
(5 is entered in X-register; 3 stays in Y-register. )
( 5 i s m u l t i p l i e d b y 3 ; r e s u l t , 1 5 , i s p l a c e d i n X - r e g i s t e r ; Y - r e g i s t e r
becomes
(15
0 . )
moves to Y-register
(2 is added to 15; result, 17, is placed in X-register; Y-register
becomes 0)
2 e n t e r s X - r e g i s t e r . )
6-3
