10-30-2007
Quote:
For example, Windows is meant for x86
And also previously ran on MIPS, DEC-Alpha and PowerPC.
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Someday Microsoft comes up with Windows for SPARC that uses same system calls, i.e. H/W is abstracted. Any Win32 program would run on that too.
Except that any code compiled for i386 will have to be run through an emulator.
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Virtual Machines (such as JVM) do exactly that. They provide a consistent set of instructions to the programs accross platforms. Underneath these instructions are executed differently on different systems.
Absolutely, (a) at the cost of translation to the native format (b) JVM and .NET both still sit on top of an operating system, they do not replace it.
Even a JVM running in a embedded system will still run on an embedded OS, however minimalist that is.
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UNAME(1) BSD General Commands Manual UNAME(1)
NAME
uname -- Print operating system name
SYNOPSIS
uname [-amnprsv]
DESCRIPTION
The uname utility writes symbols representing one or more system characteristics to the standard output.
The following options are available:
-a Behave as though all of the options -mnrsv were specified.
-m print the machine hardware name.
-n print the nodename (the nodename may be a name that the system is known by to a communications network).
-p print the machine processor architecture name.
-r print the operating system release.
-s print the operating system name.
-v print the operating system version.
If no options are specified, uname prints the operating system name as if the -s option had been specified.
SEE ALSO
hostname(1), machine(1), sw_vers(1), uname(3)
STANDARDS
The uname utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). The -p option is an extension to the standard.
BSD
November 9, 1998 BSD