What are the four types of input, output commands?

What are the four types of I O commands that an I O module may receive when it is addressed by a processor?

Command decoding: The I/O module accepts commands from the processor, typically sent as signals on the control bus. For example, an I/O module for a disk drive might accept the following commands: READ SECTOR, WRITE SECTOR, SEEK track number, and SCAN record ID.

What is IO command?

The I/O commands allow you to own, use, read from, write to, and close devices. To direct I/O operations to a device, first issue the following commands: Issue an OPEN command to establish ownership, unless the device is your principal device. Issue a USE command to make the device the current device.

What are the different types of programmed I O available?

Programmed I/O. Interrupt- initiated I/O. Direct memory access( DMA).

What are the computer's input and output I O techniques?

There are three principal I/O techniques: programmed I/O, in which I/O occurs under he direct and continuous control of the program requesting the I/O operation; interrupt-driven I/O, in which a program issues an I/O command and then continues to execute, until it is interrupted by the I/O hardware to signal the end of ...