本标准定义了一种接口系统，用于在紧密耦合的硬件配置中互连数据处理、数据存储和外围控制设备。该系统有以下目标: 1） 允许总线上设备之间的通信，而不干扰与总线接口的其他设备的内部活动。 2） 规定设计设备所需的电气和机械系统特性，这些设备将可靠且明确地与总线接口的其他设备进行通信。 3） 指定协议，精确定义总线和与其接口的设备之间的交互。 4） 提供描述系统协议的术语和定义。 5） 允许广泛的设计自由度，以便设计师可以优化成本或性能，或两者兼而有之，而不影响系统兼容性。 6） 提供一个性能主要受设备限制而非系统接口限制的系统。

This standard defines an interfacing system used to interconnect data processing, data storage, and peripheral control devices in a tightly coupled hardware configuration. The system has the following objectives: 1) To allow communication between devices on the bus without disturbing the internal activities of other devices interfaced to the bus. 2) To specify the electrical and mechanical system characteristics required to design devices that will reliably and unambiguously communicate with other devices interfaced to the bus. 3) To specify protocols that precisely define the interaction between the bus and devices interfaced to it. 4) To provide terminology and definitions that describe system protocols. 5) To allow a broad range of design latitude so that the designer can optimize cost or performance, or both, without affecting the system compatibility. 6) To provide a system where performance is primarily device limited, rather than system interface limited.