IO devices in computer systems can

IO devices in computer systems can be classified into the following types according to their characteristics.(1) Human-computer interaction, also known as low-speed IO devices Peripheral devices are used to interact with computer users such as printers, monitors, and mice. Data exchange speeds for this type of device, such as keyboards, are relatively slow, and data exchange is typically performed in bytes. (2) Storage devices, devices used to store programs and data such as disks, tapes, and CDs. This type of device is used for data exchange, is relatively fast, and is usually a unit of blocks consisting of multiple bytes for data exchange. (3) Devices used for communication with remote devices such as network communication devices, various network interfaces, and modems. The data exchange rate is between the external device and the storage device. The use and management of network communication equipment is very different from the previous two equipment.It can be classified into the following categories according to the transmission speed.(1) Low-speed devices such as keyboards and mice whose transmission speed is only a few bytes to several hundred bytes per second. (2) Medium-speed equipment such as line printers and laser printers, which is a type of equipment with a transmission speed of thousands to tens of thousands of bytes per second. (3) High-speed equipment such as tape drives, disk drives, and CD drives, which are a type of equipment with a transmission speed in the range of several hundred kilobytes to gigabytes.The main goals of IO device management are:1. Ease of use: It is convenient for the user to use the external device and control the device to complete the user's input and output requirements.2. Increased efficiency: Improve the parallel work capacity of the system and improve the efficiency of the equipment.3. Convenient control: Improve the reliability and safety of peripherals and systems so that the system can operate normally.The function of IO device management is to develop a strategy for assigning and using devices according to the structure and device type of the input and output subsystems. This includes device allocation and recycling, peripheral device booting, disk drive scheduling, external device interrupt handling, and virtual equipment realization.