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14 Cards in this Set

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The computer unit is made up conceptually of what three major components?
- arithmetic/logic unit (ALU)
- countrol unit (CU)
- memory
The ALU and CU together are known as the ___________.
Central Processing Unit (CPU)
Which component of the CPU is used to temporarily hold data and where calculations take place?
Arithemtic/Logic Unit (ALU)
How does the control unit determine the particular instruction to be executed?
By reading the program counter, somtimes called an instruction pointer
What part of the Control Unit (CU) supervises the fetching of instructions and data from memory?
Memory Management Unit
What is a register?
A single, permanent storage location with the CPU for a particular, defined purpose.
Which registers hold the data that are used for arithmetic operations, as well as the results?
General Purpose Registers (also accumulator)
What is the purpose of the program counter register?
holds the address of the current instruction being executed
What is the role of the instuction register (IR)?
holds the actual instruction being executed currently by the computer
What does the memory address register (MAR) hold?
the address of a memory location
What does the memory data register (MDR) hold?
holds a data value that is being stored to or retieved from the memory location currently addressed by the memory address register
The control unit (CU) contains several 1-bit registers, sometimes known as flags. What do these registers do?
keep track of special conditions such as arithmetica carry and overflow, power failure, and internal computer error.
Several flags group together, are known as _________.
status registers
List the four primary types of operations most registers support:
- Registers can be loaded with values from other locations.
- Data from another location can be added to or subtracted from the value previously store in the register
- Data can be shifted or rotated roght or left by one or more bits
- Data can be tested for certain conditions