--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...