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- Powerpc software archive for mac os x#
- Powerpc software archive mac os x#
- Powerpc software archive archive#
- Powerpc software archive portable#
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In some ways it’s more like telling the difference between ambiguous date formats - “” means 2 January 2006 in the U.S., but means 1 February 2006 in Europe. You can’t just look at a chunk of bytes and know their endianness. Wikipedia uses the analogy of the difference between left-to-right languages like English and right-to-left languages like Hebrew - neither is more efficient than the other, it’s just an arbitrary decision.īut dealing with endianness-related issues is tricky - unlike English and Hebrew, which are easily identified at a glance, bytes are just sequences of ones and zeroes. The difference is the order in which bytes are arranged in a multi-byte sequence on a big-endian system bytes are ordered from most to least significant on a little-endian system, they’re ordered from least to most significant. Others are little-endian, most notably the Intel x86 family. Some processor architectures are big-endian, including the PowerPC and Motorola 68000 families. Read the Wikipedia entry for details, but a nutshell description will suit us just fine.
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Powerpc software archive mac os x#
The trick with universal binaries is that the GCC compiler at the heart of Xcode is now capable of producing executable files that contain both PowerPC and x86 machine code, and the Mac OS X kernel knows which half of a universal binary is the one meant for your computer.Īnother low-level problem is that of endianness.
Powerpc software archive archive#
You download an archive of C code, compile it, and it should “just work”, no matter which type of processor your system is using. This is how most Unix software works, actually.
Powerpc software archive portable#
If you write portable C, where by “portable” I mean code that doesn’t rely on proprietary or non-standard APIs, you can simply recompile the same code using a different compiler to produce machine code for a different processor. A compiler is what turns C code into machine code. 1īut most programmers don’t write assembly language, they write in higher-level languages like C, C++, and Objective-C. Machine code for the 68000 processor could run on the 6800, but it couldn’t run on, say, the x86 family of processors from Intel. So, for example, the Motorola 680 × 0 family of processors - the ones used by the original Macintosh - understands its own brand of machine code. Another problem is that each family of computer processors uses a different instruction set for its machine code, and, therefore, a different assembly language. And even if you’re a gifted enough programmer that you don’t find it hard, it’s certainly tedious - there are few conveniences or shortcuts and no abstractions. One problem with assembly language is that it’s hard. Today, very few programmers write assembly language, but it is still used for code where every last ounce of efficiency is needed. Assembly language is a low-level language that, more or less, is a more human-friendly syntax for machine code. Almost no one writes machine code by hand, even though machine code is the only thing a computer processor accepts as input. Machine code is, even for most programmers, inscrutable. Modern processors execute billions of instructions per second. An instruction might be to store a certain value on a register (a register is a small amount of very fast memory), or to add the values of two registers. A Wee Bit of Technical Background for Non-Developers, With the Goal of Explaining the Difficulty of Developing for Multiple Computer Architectures, but Which Will Be Kept Relatively Brief Because Wikipedia Has Excellent Entries on All This StuffĪ computer processor reads and executes instructions in machine code. Curiously, the Mac version only runs on Intel-based Macs.
Powerpc software archive for mac os x#
Last week, Adobe released a public beta of a new sound editing application for Mac OS X and Windows, Soundbooth. Why Is Adobe Soundbooth Intel-Only? Thursday, 2 November 2006