TM 5-6675-325-14
(4) X MEMORY. Has four settings: 1, 2, 3, and 4. Tells the calculator which
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-sealer.
(6) B/ACCU/A/OFF.
Controls 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.
5-3.4 Calculator.
Performs manipulations and calculations on pulse count
data, prints results and intermediate steps in the proper units on command, and
stores data and programs.
There are six functional parts: memory, logic
circuitry, keyboard, LED display, magnetic card reader, and printer.
a.
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.
Storage registers.
Used to store special numbers such as pulse counts and
constants.
Each 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.
The 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
and constants that need to be readily available and accessible for use.
The
MEMORY 1, 2, 3, or 4 signal is a release command for the contents of the
corresponding primary register,
R1, R2, R3, or R4.
The remaining 12 primary
registers are only used when operating programs.
The secondary registers contain
data that Is not immediately needed.
They are only accessible through the use of
the special command key P
S.
d. Program memory.
Stores the instructions of a complete program or subroutine.
Programs and subroutines are entered into the memory either manually, keyed in
from the keyboard, or from a preprogrammed magnetic card. The programs are
recalled by command each time new information must be processed. A subroutine
automatically processes data and implements recorded instructions.
e.
Logic circuitry.
Performs all calculations, commands, and data and signal
The logic circuitry is the interface for all external inputs,
auto-scaler signals, and directs all operations of the calculator.
transfers<
including
5-9
