the complete set of machine code instructions used by a CPU.

all interrupts are given a priority so that the processor knows which need to be serviced first and which interrupts are to be dealt with quickly.

holds all data and programs needed to be accessed by the control unit.

carries the addresses throughout the computer system.

different methods of using the operand part of a machine code instruction as a memory address.

used to describe a bus in which bits can travel in both directions.

no bits are lost, bits shifted out of one end of the register are introduced at the other end of the register.

carries the addresses throughout the computer system.

mode of addressing in which the memory address used is the current memory address added to the operand.

mode of addressing in which the contents of the contents of the memory location in the operand are used.

no bits are lost, bits shifted out of one end of the register are introduced at the other end of the register.

mode of addressing in which the contents location in the operand are used.

mode of addressing in which the contents of the memory location found by adding the contents of the index register (IR) to the address of the memory location in the operand are used.

mode of addressing in which the contents of the memory location found by subtracting the contents of the index register (IR) to the address of the memory location in the operand are used.

mode of addressing in which the value of the operand only is used.

mode of addressing in which the contents of the memory location found by adding the contents of the index register (IR) to the address of the memory location in the operand are used.

no bits are lost, bits shifted out of one end of the register are introduced at the other end of the register.

mode of addressing in which the contents of the memory location in the operand are used, which is the same as absolute addressing.

mode of addressing in which the memory address used is the current memory address added to the operand.

carries the addresses throughout the computer system.

moving the bits stored in a register a given number of places within the register; there are different types of shift.

different methods of using the operand part of a machine code instruction as a memory address.

mode of addressing in which the contents of the memory location found by adding the contents of the index register (IR) to the address of the memory location in the operand are used.

Von Neumann architecture

allows data to be carried from processor to memory (and vice versa) or to and from input/output devices.

the sign of the number is preserved.

mode of addressing in which the value of the operand only is used.

Arithmetic logic unit (ALU)

mode of addressing in which the contents of the contents of the memory location in the operand are used.

ensures synchronisation of data flow and programs throughout the computer by sending out control signals along the control bus.

mode of addressing in which the memory address used is the current memory address added to the operand.

mode of addressing in which the contents of the memory location in the operand are used, which is the same as absolute addressing.

changing the clock speed of a system clock to a value higher than the factory/recommended setting.

produces timing signals on the control bus to ensure synchronisation takes place.

a number that is used with the logical operators AND, OR or XOR to identify, remove or set a single bit or group of bits in an address or register.

different methods of using the operand part of a machine code instruction as a memory address.

carries the addresses throughout the computer system.

Immediate access store (IAS)

holds all data and programs needed to be accessed by the control unit.

a unit made up of ALU, control unit and registers which is part of a CPU. A CPU may contain a number of cores.

serial refers to a single wire being used to transmit bits of data one after the other. Asynchronous refers to a sender using its own clock/timer device rather sharing the same clock/timer with the recipient device.

temporary general purpose register which stores numerical values at any part of a given operation.

produces timing signals on the control bus to ensure synchronisation takes place.

software which handles interrupt requests (such as ‘printer out of paper’) and sends the request to the CPU for processing.

temporary component in the processor which can be general or specific in its use that holds data or instructions as part of the fetch execute cycle.

a number that is used with the logical operators AND, OR or XOR to identify, remove or set a single bit or group of bits in an address or register.

mode of addressing in which the value of the operand only is used.

different methods of using the operand part of a machine code instruction as a memory address.

serial refers to a single wire being used to transmit bits of data one after the other. Asynchronous refers to a sender using its own clock/timer device rather sharing the same clock/timer with the recipient device.

a register used in a computer to store the address of the instruction which is currently being executed.

a high speed auxiliary memory which permits high speed data transfer and retrieval.

holds all data and programs needed to be accessed by the control unit.

a number that is used with the logical operators AND, OR or XOR to identify, remove or set a single bit or group of bits in an address or register.

carries the addresses throughout the computer system.

ensures synchronisation of data flow and programs throughout the computer by sending out control signals along the control bus.

a cycle in which instructions and data are fetched from memory and then decoded and finally executed.