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1. 发明授权

US4727480A Emulation of a data processing system 失效
标题翻译：数据处理系统的仿真
公开(公告)号：US4727480A
公开(公告)日：1988-02-23
申请号：US629028
申请日：1984-07-09
申请人： Loren O. Albright , David J. Angel , Patrick Klos , James P. Moskun , Carol W. Tyler
发明人： Loren O. Albright , David J. Angel , Patrick Klos , James P. Moskun , Carol W. Tyler
IPC分类号： G06F11/26 , G06F9/44 , G06F9/455 , G06F9/46 , G06F9/48 , G06F13/10 , G06F9/00
CPC分类号： G06F13/105
摘要： Emulation method and apparatus allowing a first system, which is not designed as a functional duplicate of a second system, to emulate the second system. The input/output structure of the second system is emulated in the first system by means of routines stored therein and which direct the already existing input/output structure to operate in the same manner as the input/output structure of the second system. The emulation routines are in turn invoked through the non-maskable interrupt mechanism of the first system by a modification thereto which detects the occurrence of "foreign" input/output requests; that is, input/output requests occuring in programs originally written for the second system and which are not normally recognized by the first system. The means for detecting foreign input/output requests includes means for comparing input/output request port addresses to the range of port addresses occupied by the system input/output devices and indicating when a port address is within the range of address space occupied by the system input/output devices. The foreign request detection means generates a non-maskable interrupt to invoke an input/output emulation routine upon the occurrence of input/output requests which do not normally fall within the range of input/output ports supported by the first system.
摘要翻译：允许不被设计为第二系统的功能副本的第一系统模拟第二系统的仿真方法和装置。第二系统的输入/输出结构通过存储在其中的程序在第一系统中被仿真，并且以与第二系统的输入/输出结构相同的方式指导已经存在的输入/输出结构来操作。通过其检测“外部”输入/输出请求的发生的修改，通过第一系统的不可屏蔽中断机制来调用仿真例程; 也就是说，最初为第二系统编写的程序中的输入/输出请求发生，而第一系统通常不被识别。用于检测外部输入/输出请求的装置包括用于将输入/输出请求端口地址与系统输入/输出设备占用的端口地址的范围进行比较并指示端口地址何时在系统占用的地址空间范围内的装置输入/输出设备。外部请求检测装置在出现通常不在第一系统支持的输入/输出端口范围内的输入/输出请求时产生不可屏蔽的中断来调用输入/输出仿真程序。

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