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ISA(Industrial Stantard Architecture)是IBM公司推出的总线标准,它支持8位和16位数据传输,且具有20位(实地址)和24位(虚地址)寻址能力,它支持多主控总线操作。目前绝大多数微机都支持这种平台结构,基于ISA平台设计扩充卡(如显示卡、汉卡以及网卡等)已成为扩充微机外设资源的有效手段。而目,由于ISA平台在大多数工业控制PC上得到了强有力的支持,使得基于ISA平台的设备控制接口卡成为工业生产自动化及实时设备监控中的重要组成部分。本文结合ISA平台的结构特点,给出了ISA平台下开发、访问I/O资源扩充卡的部分实用技术。
ISA (Industrial Stantard Architecture) is IBM’s bus standard, which supports 8-bit and 16-bit data transfer, and has 20 (real address) and 24 (virtual address) addressing capabilities, which supports multi-master bus operation . At present, the vast majority of microcomputer support this platform structure, based on the ISA platform to design expansion cards (such as graphics cards, Han cards and network cards, etc.) has become an effective means of expanding the computer peripheral resources. However, as the ISA platform has been strongly supported by most industrial control PCs, the device control interface card based on the ISA platform has become an important part of industrial production automation and real-time device monitoring. Based on the structural features of the ISA platform, this paper presents some practical techniques for developing and accessing I / O expansion cards under the ISA platform.