Chapter 5

--Admiral Grace Murray Hopper
A coil of wire nearly 1,000 feet long
-Distance traveled by an electron along the wire in the space of a microsecond.

A short piece of wire
-In the space of a nanosecond.

A bag containing grains of pepper
-In the space of a picosecond.

dot pitch is the distance between the pixels on your screen. Smaller number is better screen resolution and better picture.

Memory
A collection of cells, each with a unique physical address; both addresses and contents are in binary.

Processor has Arithmetic/Logic Unit

Performs basic arithmetic operations such as adding.

Performs logical operations such as AND, OR, and NOT.

Most modern ALU's have a small amount of special storage units called registers.

Control unit
-The organizing force in the computer.

Instruction register (IR)
-Contains the instruction that is being executed.

Program counter (PC)
-Contains the address of the next instruction to be executed.

Central Processing Unit (CPU)
-ALU and the control unit called the, or CPU.

Bus
-A set of wires that connect all major sections.

The Fetch-Execute Cycle

Fetch the next instruction
Decode the instruction
Get data if needed
Execute the instruction

RAM (Random Access Memory) and ROM (Read Only Memory)

Seek time
-time it takes for read/write head...