An I/O interface is required whenever the I/O device is driven by a processor. Typically a CPU communicates with … See more

Channel I/O requires the use of instructions that are specifically designed to perform I/O operations. The I/O instructions address the channel or the channel and device; the channel asynchronously accesses all other required ad… See more

Port-mapped I/O also requires the use of special I/O instructions. Typically one or more ports are assigned to the device, each with a special purpose. The port numbers are in a separate address space from that u… See more

Direct memory access (DMA) is a means for devices to transfer large chunks of data to and from memory independently of the CPU. See more

• Asynchronous I/O
• I/O bound
• Input device
• Output device See more

• Media related to Input/output at Wikimedia Commons See more