18WuD2x

42 assemble • astrionics
Symbols for ASCII teleprinter code
First
Last three signals
four
signals 000 001 010 011 100 101 110 111
0000 NUL DLE SPC 0 P / p
0001 SOH DC1 ! 1 A Q a q
0010 STX DC2 " 2 B R b r
0011 ETX DC3 # 3 C S c s
0100 EOT DC4 $ 4 D T d t
0101 ENQ NAK % 5 E U e u
0110 ACK SYN & 6 F V f v
0111 BEL ETB ' 7 G W g w
1000 BS CAN ( 8 H X h x
1001 HT EM ) 9 I Y i y
1010 LF SUB * : J Z j z
1011 VT ESC + ; K [ k {
1100 FF FS , < L / l /
1101 CR GS – = M ] m }
1110 SO RS . > N n ~
1111 SI US | ? O - o DEL
ACK: acknowledge
BEL: bell
BS: back space
CAN: cancel
CR: carriage return
DC1: device control no. 1
DC2: device control no. 2
DC3: device control no. 3
DC4: device control no. 4
DEL: delete
DLE: data link escape
ENQ: enquiry
EM: end of medium
EOT: end of transmission
ESC: escape
ETB: end of transmission
block
ETX: end of text
FF: form feed
FS: file separator
GS: group separator
HT: horizontal tab
LF: line feed
NAK: do not acknowledge
NUL: null
RS: record separator
SI: shift in
SO: shift out
SOH: start of heading
SPC: space
STX: start of text
SUB: substitute
SYN: synchronous idle
US: unit separator
VT: vertical tab
symbolic program language into a machine (binary)
language program by substituting operation
codes and addresses.
assembly 1. A finished unit that can be either a
practical working model or a dummy, a prototype,
or a final model; an integrated aggregation
of subunits. 2. A low-level computer source-code
language that uses crude mnemonics that are
easier to remember than the machine-language
equivalents.
assembly language A source code that uses
mnemonic instructions. (See ASSEMBLY, 2.)
assembly program The program that operates on
a symbolic-language program to produce a machine
language program in the process of assembly.
Also called assembler.
assembly robot A form of industrial robot that puts
hardware together. Such a robot is generally a
component of an automated integrated manufacturing
system (AIMS). The robot can do repetitive
work at high speed and precision for long periods
of time.
assign To reserve part of a computing system for a
specific purpose, normally for the duration of a
program run.
assigned frequency The radio carrier frequency or
band of frequencies designated for a transmitting
station by a licensing authority. Also see RADIO
SPECTRUM.
associative memory Computer memory in which
locations are identified by content, rather than by
specific address.
assumed decimal point A decimal point that does
not occupy an actual computer storage space,
but is used by the computer to align values for
calculation; the decimal point is assumed to be at
the right unless otherwise specified.
astable Having two temporary states; BISTABLE.
astable circuit A circuit that has two unstable
states, and whose operation is characterized by
alternation between those states at a frequency
determined by the circuit constants.
astable multivibrator A free-running multivibrator.
The common circuit uses two bipolar or fieldeffect
transistors, their inputs and outputs being
cross coupled. Conduction switches alternately
between the two.
astatic 1. Without fixed position or direction. 2. In
a state of neutral equilibrium.
astatic galvanometer A galvanometer with a movable
element consisting of two identical magnetized
needles mounted nonparallel on the same
suspension. Each needle is surrounded by a coil.
The coils are wound in opposite directions, and
are connected in series to the current source. A
large permanent magnet provides the field
against which the needle assembly rotates. The
instrument functions independently of the geomagnetic
field.
astatine Symbol, At. A radioactive elemental halogen
produced from radioactive decay. Atomic
number, 85. Atomic weight, 210. Formerly called
alabamine.
A station One of the two stations in the transmitting
system of LORAN (long-range navigation).
astigmatism A focusing fault in a cathode-ray
tube (CRT), in which electrons in different axial
planes focus at different points.
ASTM Abbreviation for American Society for Testing
and Materials.
astrionics The design, production, and application
of electronic devices and systems for use in space
vehicles and space navigation.