TM 5-6675-323-14
(4) X MEMORY. H a s f o u r s e t t i n g s : 1 , 2 , 3 , a n d 4 . T e l l s t h e c a l c u l a t o r w h i c h
primary register memory location (1, 2, 3, or 4), and its contents, is to be used
in calculations.
(5) MAN/AUTO.
Determines the mode of data transmission for the auto-scaler.
( 6 ) B/ACCU/A/OFF. C o n t r o l s the operating status of the decade up/down
counter.
There are four possible settings: OFF, A, ACCU, and B. OFF turns the
auto-scaler OFF. A enables the decade up/down counter to increment the count, B
enables it to decrement the count, and ACCU freezes the decade up/down counter at
its current total.
9-3.3 Calculator.
Performs manipulations and calculations on pulse count
d a t a , prints results and intermediate steps in the proper units on command, and
stores data and programs. T h e r e a r e s i x f u n c t i o n a l p a r t s : m e m o r y , l o g i c
circuitry, keyboard, LED display, magnetic card reader, and printer.
Memory.
Stores pulse count data, constants, results of calculations, and
subroutines containing programmed instructions (for using pulse count data and
constants).
In order to use the QPS, the programs with instructions for
performing calculations are entered into the calculator memory. The memory is
divided into three parts:
automatic memory stack, storage registers, and program
memory.
b . Automatic memory stack.
Has four available locations (X, Y, Z, and T) which
are used by the operator and the calculator in performing calculations. The logic
circuitry uses the automatic memory stack in performance of its instructions and to
store intermediate results of calculations.
c . S t o r a g e r e g i s t e r s . U s e d to store special numbers such as pulse counts and
constants.
E a c h register can hold one constant number or command. Primary
register R1 is directly connected to the calculator interface circuitry in the
auto-scaler.
Contents of storage registers are affected only by the keyboard or
program command. T h e INIT signal begins a program which commands the calculator to
clear the storage registers. The storage registers are divided into two parts: 16
primary registers and 9 secondary registers.
The primary registers contain data
a n d c o n s t a n t s t h a t n e e d t o b e r e a d i l y a v a i l a b l e a n d a c c e s s i b l e f o r u s e . The
M E M O R Y 1, 2, 3, or 4 signal is a release command for the contents of the
c o r r e s p o n d i n g p r i m a r y r e g i s t e r , R 1 , R2, R3, or R4.
T h e remaining 12 primary
registers are only used when operating programs. The secondary registers contain
d a t a that is not immediately needed. T h e y a r e o n l y a c c e s s i b l e t h r o u g h t h e u s e o f
the special command key
.
d. Program memory. Stores the instructions of a complete program or subroutine.
P r o g r a m s and subroutines are entered into the memory either manually, keyed in
f r o m the keyboard, or from a preprogrammed magnetic card. The programs are
r e c a l l e d by command each time new information must be processed. A subroutine
automatically processes data and implements recorded instructions.
e . L o g i c c i r c u i t r y . Performs all calculations, commands, and data and signal
transfers.
The logic circuitry is the interface for all external inputs,
including auto-scaler signals, and directs all operations of the calculator.
9-9
