TM 5-6675-322-14
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
of the key is selected by first pressing prefix key and then the function key.
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 .
S t o r a g e r e g i s t e r s.
Storage registers are used to set aside numbers for
r e c a l l i n l a t e r c a l c u l a t i o n s .
Numbers are stored by first pressing
f o l l o w ed
by a number thru or a decimal point and a number thru . The number in
d i s p l a y e d X - r e g i s t e r i s t h e n c o p i e d i n t o t h e s e l e c t e d r e g i s t e r . R e c a l l i n g a n u m b er
is accomplished by first pressing followed by a number thru 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.0
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 a l
d a t a.
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
During chain calculations (long equations), intermediate answers are
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 ts
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 to
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 0.)
( 1 5 m o v e s t o Y - r e g i s t e r ; 2 e n t e r s x - r e g i s t e r .)
( 2 i s a d d e d t o 1 5 ; r e s u l t , 1 7 , 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 er
becomes 0.)
3-3
