Addressability – the number of bits stored in each
addressable location in memory.
0 – 2 volts – low; 0 Arithmetic/logic unit – the computer component that
Compu2 – 5 volts – high; 1
performs arithmetic operations (addition, subtraction,
• Gate – a device that Transistor – a device multiplication, division) and logical operations
performs a basic operation that acts either as a (comparison of two values).
on electrical signals, wire or a resistor,
Register – a small storage area in the CPU used to
accepting one or more input depending on the store intermediate values or special data.
signals and producing a voltage level oOutput Input unit – a device that accepts data to be stored in
single output signal. input signal.
• Circuit – a combination of memory.
interacting gates designed Semiconductor – Output unit – a device that prints or otherwise displays
to accomplish a specific Sum material such as data stored in memory or makes a permanent copy of
logical function. Carry = ABn that is neither a
• Boolean algebra – a good conductor not a information stored in memory or another device.
good insulator.binationalControl unit – the computer that controls the actions of
mathematical notation for by its input the other components so as to execute instructions in
logical functions. Sequential cisequence. circuit whose output is a function of its input
• Logic diagram – a values and thInstruction register (IR) – the register that contains
graphical representation of Circuit equivthe instruction currently being executed.onding input
a circuit; each type of gate
has its own symbol. value combinaProgram counter (PC) – the register that contains the
Adder – an eladdress of the next instruction to be executed.ation on
• Truth table – a table binary values.
showing all possible input CPU – the central processing unit, a combination of the
values and the associated Half adder – arithmetic/logic unit and the control unit; the “brain” of
output values. produces the a computer that interprets and executes instructions.
Full adder – Bus width – the number of bits that can be transferred
input carry bin parallel over the bus.
SR latch using Integrated ciCache memory –a type of small, highspeed memory s have
NAND gates Abbreviation used to hold frequently used data.
SSI Pipelining – a technique that breaks an instruction into
MSI smaller steps that can be overlapped. (AB)’ = A’ OR B’
(A+B)’ = A’ B’
DeMorgan’s Law Base register – a register that holds the beginninPartition Memory Management
Opmpaddress of the current partition. ricity/ Computing Compo