COMPUTER SYSTEMS Flashcards

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1
Q

Program counter

A

Memory location of current instruction

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2
Q

Memory data register

A

Data fetched from memory

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3
Q

Memory address register

A

Stores address of next data/instruction to be fetched from memory

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4
Q

Accumulator

A

Stores results of calculatations

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5
Q

What are data buses

A

Data flows

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6
Q

Types of buses

A

Data bus, control bus, address bus

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7
Q

What is pipelining

A

When you start the next job while one is currently still being executed

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8
Q

Optical storage devices

A

CD DVD BLUE RAY

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9
Q

example of volatile and non volatile memory

A

Volatile ram

Non rom

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10
Q

What is von Neumann arch

A

Single control unit, everything sent along the data bus

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11
Q

Harvard arch

A

Data and instructions are stored separately in memory

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12
Q

RISC vs CISC

A

RISC has less instructions, most instructions work on registers
CISC has more transitory and is more expensive

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13
Q

LAW OF COMMUTATION

A

ORDER OF EXPRESSIONS DOES NOT MATTER.

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14
Q

LAW OF DISTRIBUTION

A

A AND (B OR C) = A AND B, OR, A AND C
(EXPAND BRACKETS LIKE ALGEBRA)
Same other way round

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15
Q

3 steps for DE MORGANS LAW

A

1 change and to or, OR change or to and inside brackets
2. Not the terms either side of the operator inside the bracket
3 not the outside bracket, and simplify double negation

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16
Q

Two ways RAM is divided and what it does (4)

A

PAGING MEMORY IN FIXED SIZE UNITS

SEGMENTATION MEMORY DIVIDED INTO VARIABLE SIZE UNITS