3.13

Accumulator holds the results within in an event so the results can be dealt within one procedure (So it doesn't have to leave RAM)

Buses are 'wires', communication wire (E.g USB).
Address Bus is information about the receiver
Control Bus - Controls the communication to all parts of the system from the CPU. Wires that come out of the CPU.

Co Processor - Graphics Card
Parallel Processor - Dedicate a processor to a particular task which makes it faster. 2 instructions can happen at once. Operating system must be programmed to use 2 processors. E.g Facebook server, Delegation of task. E.g One processor deals with internet requests, others deal with something else etc.
Array Processor - Deal with repetitive tasks