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2024年3月22日发(作者：)

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专利名称：EMULATION OF A DATA PROCESSING

SYSTEM

发明人：LOREN O. ALBRIGHT,DAVID J.

ANGEL,PATRICK KLOS,JAMES P.

MOSKUN,CAROL W. TYLER

申请号：AU4457185

申请日：19850704

公开号：AU4457185A

公开日：19860116

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.

申请人：WANG LABORATORIES INC.

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