TM 5-6675-318-14
(1) Display window. Shows digits, decimal point and/or signs actually seen
by operator. Standard format includes an integer, decimal, floating decimal point
and floating minus sign.
If a number calculated or input is too large to fit in standard format, calculator
automatically reverts to a display in scientific notation, where number represented
Equals: Mantissa x 10
Exponent
The format of display window can be changed via keyboard to appear in engineering
notation (exponent is always a multiple of 3) or with a fixed (unmovable) decimal
p o i n t .
( 2 ) D i s p l a y r e g i s t e r . I s a n i n t e r n a l m e m o r y r e g i s t e r t h a t r e t a i n s , t o 13
digits, all numbers calculated, regardless of how number appears in display window.
Large numbers can be rounded off for display in display window, but complete number
i s s t i l l r e t a i n e d i n r e g i s t e r .
d .
Internal memory. Is composed of the following memory registers:
S u b r o u t i n e r e t u r n r e g i s t er
T - r e g i s t e r
Program/Data storage registers
Reserved registers
AOS registers
F l a g r e g i s t e rs
( 1 ) S u b r o u t i n e r e t u r n r e g i s t e r . A n a u t o m a t i c r e g i s t e r u s e d b y c a l c u l a t o r to
store the last location of program pointer when an SBR (go to subroutine) instruc-
t i o n w a s i m p l e m e n t e d . I f t h e s u b r o u t i n e h a s a r e t u r n i n s t r u c t i o n , t h i s r e g i s t er
tells the calculator to return to the proper point for continuing program.
( 2 ) T - r e g i s t e r.
Data-type test register for storing numbers, one at a time,
that will be compared to the display at some point in a program or calculation. The
location and use of T-register in the calculator cannot be changed .
(3) Program/Data Storage Registers. Used to store data and/or program memory
l o c a t i o n s . T h e r e a r e a t o t a l o f 1 2 0 r e g i s t e r s a v a i l a b l e t o t h e o p e r a t o r . O ne
register can contain one piece of data (a number) or eight program locations (key
codes). The registers are divided into four banks, numbered 1 thru 4, with 3 0
7-11
.
