Boots – shoes – and leggings
Patent
1984-07-09
1988-02-23
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 900
Patent
active
047274808
ABSTRACT:
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.
REFERENCES:
patent: 4370709 (1983-01-01), Fosdick
patent: 4377852 (1983-03-01), Thompson
The Wang Professional Computer Technical Reference Manual, First Edition, Apr. 1983, Wang Laboratories Inc., Lowell Mass.
IBM Technical Reference Manual for the IBM Personal Computer, Aug. 1981, IBM Corporation, Armonk, New York.
Albright Loren O.
Angel David J.
Klos Patrick
Moskun James P.
Tyler Carol W.
Mills John G.
Peterson Scott K.
Shanahan Michael H.
Shaw Gareth D.
Wang Laboratories, Inc.
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