1.1 Systems Architecture

• Executes instructions • Searching • Sorting • Calculating • Logics

• Input • Output • Memory • Arithmetic Logic Unit • Control Unit • Accumulator • Registers

• A computer built within a larger architecture for a specific purpose

• Washing machines • Microwaves • Calculators

• A computer in which both data and program can be stored together

• Abbreviation of operation code • The actual instruction ( STA, LDA, etc )

• Numerical, text and Boolean values for decisions

• Fetch, decode, execute

• Program counter holds address of the next instruction to be executed • Memory address register holds the location of the instruction of the program counter • Memory data register copies contents of the memory address register and carries it out. • Current instruction register copies the data register, ending the fetch cycle.

• Holds the result of the instruction before transferred to memory

• Holds address of the next instruction to be executed • Increments by one

• Holds the location of the instruction of the program counter • Memory address register

• Control Unit • Controls memory • Controls ALU • Controls input / output

• Copies contents of the memory address register and carries it out, as well as the instructions • Memory data register

• Core numbers • Clock speed • Cache size

• The numbers of processing units • x(yGHz)

• The amount of instructions carried out per second (Hz) • Note : GHz = One billion hertz

• Memory of the CPU • Holding frequently used instructions • Faster than RAM but slower than registers

• Load

• Halt

• Store

• Declaring variables