Editing Direct memory access (section)

=== Bus mastering ===
In a [[bus mastering]] system, also known as a first-party DMA system, the CPU and peripherals can each be granted control of the memory bus.  Where a peripheral can become a bus master, it can directly write to system memory without the involvement of the CPU, providing memory address and control signals as required. Some measures must be provided to put the processor into a hold condition so that [[bus contention]] does not occur.