TM5-6675-326-14
6-3.3.1.2 Storage Registers - Continued
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
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 .
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.
6-3.3.1.3 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.
6 - 3 . 3 . 2 L o g i c C i r c u i t r y . P e r f o r m s a l l c a l c u l a t i o ns , commands, and data
a n d s i g n a l t r a n s f e r s . T h e l o g i c c i r c u i t r y i s t h e i n t e r f a c e f o r a ll
e x t e r n a l i n p u t s , i n c l u d i n g a u t o - s c a l e r s i g n a l s, a n d d i r e c t s a l l o p e r a t i o n s
o f t h e c a l c u l a t o r.
6-3.3.3 Keyboard. Gives operator direct access and control of the
c a l c u l a t o r o p e r a t i o n .
Pressing a key results in the corresponding command
or signal being sent to the logic circuitry and memory.
The keyboard has
two modes:
PRGM (program) and RUN.
In P R G M , all keystroke signals are
entered into the memory and sent to the logic circuitry which identifies
the location on the keyboard of the function, letter, or number the
k e y s t r o k e s i g n a l r e p r e s e n t s.
In R U N , all keyboard signals are sent to the
l o g i c c i r c u i t r y f o r i m p l e m e n t a t i o n o r t r a n s f e r .
6 - 3 . 3 . 4 L E D D i s p l a y . D i s p l a y s l a s t e n t r y m o d e i n t o c a l c u l a t o r o r
contents of any memory register when commanded.
Also provides all the
visual indications of error conditions that may exist and the key code of
each step of a program when being entered or run.
6-3.3.5 Magnetic Card Reader. Used to store programs and subroutines on
magnetic cards.
Reads and loads contents of preprogrammed cards into
calculator memory.
6 - 3 . 3 . 6 P r i n t e r .
Provides hard copy of any data, calculation results, or
program steps.
6-3.4 Remote Control Switches. The planimeter pushbutton remote tracer
switch and foot switch enable the operator to remotely activate two of
four possible signals:
CLEAR, PRINT, INIT, or ACCU. The signals that the
switches control depend on which input jacks the switches are plugged
i n t o .
6-3.5 Power Transformers. Converts ac power to dc power on the
auto - scaler . The calculator uses ac power.
6-10
