tailieunhanh - A Technical History of Apple’s Operating Systems phần 8

các ứng dụng startmac chịu trách nhiệm cho việc tạo ra môi trường Macintosh dưới Một UX /. Biến thể startmac24 đã được sử dụng với 24-bit địa chỉ. Nhiều khía cạnh của môi trường này đã được tùy biến, bao gồm cả ứng dụng chạy như Finder. Sau đây là những ví dụ của tính năng như vậy. Các tính năng đáng chú ý khác bao gồm những điều sau đây | 96 Chapter 1 A Technical History of Apple s Operating Systems of NEXTSTEP for the x86 platform. Figure 1-27 shows the timeline of NeXT s operating systems. RIG Mach mid 1970s Accent Mach circa 1979 Mach NeXT additions to Mach Mach --------------------------- Mach Mach OpenStep Specification 1994 Ĩ NEXTSTEP September 1989 September 1990 March 1991 September 1992 May 1993 October 1993 February 1995 OPENSTEP July 1996 December 1996 Apple buys NeXT February 4 1997 _ January 1997 FIGURE 1-27 The timeline of NeXT s operating systems Mac OS X Internals 97 Canon had a personal workstation the 41 which was designed to run NEXTSTEP. The system s 100 MHz Intel 486DX4 processor was upgradeable to an Intel Pentium OverDrive processor. Besides NEXTSTEP as the operating system the machine included Insignia Solutions SoftPC. . OPENSTEP NeXT partnered with Sun Microsystems to jointly release specifications for OpenStep an open platform comprised of several APIs and frameworks that anybody could use to create their own implementation of an object-oriented operating system running on any underlying core operating system. The OpenStep API was implemented on SunOS HP-UX and Windows NT. NeXT s own implementa-tion essentially an OpenStep compliant version of NEXTSTEP was released as OPENSTEP in July 1996 with and following shortly afterwards. The OpenStep API and the OPENSTEP operating system did not seem to turn things around for NeXT even though they caused some excitement in the business enterprise and government markets. NeXT started to shift focus to its WebObjects product which was a multiplatform environment for rapidly building and deploying web-based applications. As we saw earlier NeXT was purchased by Apple in early 1997. Mac OS X would be based on NeXT s technology. WebObjects would keep up with advancements in its domain as exemplified by its support for Web .