ECA VRT DVD 2012.rar

During the 1980s, Digital Equipment Corporation (DEC) planned to replace it=
s flagship platform and operating system, the VAX minicomputer and the Virt=
ual Memory System (VMS), with new products based on a different architectur=
e and design. The new products were the PRISM architecture, which was a 64-=
bit reduced instruction set computing (RISC) architecture, and the MICA ope=
rating system, which was a distributed and object-oriented operating system=
.[52] However, these projects faced technical and managerial difficulties a=
nd were cancelled in 1988, leaving DEC without a clear strategy for the fut=
ure.[53] To address this situation, a team was set up to design new VAX/VMS=
 systems that could compete with the RISC-based Unix systems that were gain=
ing popularity in the market.[53] The team tried to design a faster VAX-com=
patible processor, but failed to achieve the desired performance and compat=
ibility goals.[54] Instead, the team showed that it was possible to port VM=
S and its applications to a RISC architecture based on PRISM, without losin=
g any functionality or performance.[54] This idea led to the creation of th=
e Alpha architecture, which was a 64-bit RISC architecture that supported m=
ultiple operating systems, including VMS.[55] The project to port VMS to Al=
pha started in 1989, and successfully booted VMS on a prototype Alpha syste=
m with an EV3 processor in early 1991.[54][56]

ECA VRT DVD 2012.rar
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The porting of VMS to Alpha was a complex and challenging task, as VMS was =
a highly optimized and integrated operating system that relied on many feat=
ures and assumptions of the VAX architecture.[57] The porting team had to r=
ewrite or modify many parts of the VMS kernel, libraries, utilities, and co=
mpilers to make them work on Alpha.[58] The team also had to ensure that th=
e ported VMS maintained binary compatibility with existing VAX applications=
, which required implementing a VAX instruction emulator and a VAX calling =
standard on Alpha.[59] The team also had to deal with the differences in en=
dianness, word size, alignment, and floating-point formats between VAX and =
Alpha.[60]


The porting of VMS to Alpha was completed in 1992, and the first version of=
 VMS for Alpha, VMS Version 1.0 for Alpha AXP Systems, was released in Janu=
ary 1993.[61] The first Alpha systems that ran VMS were the DEC 3000 AXP se=
ries, which were based on the EV4 processor.[62] The ported VMS achieved hi=
gh performance and compatibility on Alpha, and was able to run most of the =
existing VAX applications without recompilation or modification.[63] The po=
rted VMS also supported new features and enhancements that were enabled by =
the Alpha architecture, such as larger address space, faster system calls, =
dynamic linking, shared libraries, and multiprocessing.[64]


The porting of VMS to Alpha was a major milestone in the history of DEC and=
 VMS. It demonstrated the technical excellence and innovation of the DEC en=
gineers and the adaptability and robustness of the VMS operating system. It=
 also extended the lifespan and marketability of VMS in the face of increas=
ing competition from Unix and Windows. The ported VMS became the basis for =
further development and evolution of the operating system, which is still i=
n use today under the name OpenVMS.[65]


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