为什么1字节等于8位? [英] Why is 1 Byte equal to 8 Bits?

问题描述

为什么不是4位或16位?

Why not 4 bits, or 16 bits?

我假设一些与硬件相关的原因，我想知道8bit 1byte如何成为标准.

I assume some hardware-related reasons and I'd like to know how 8bit 1byte became the standard.

推荐答案

距离我从事计算机组织工作还不到一分钟，但是相关的维基提供了一些上下文.

I'ts been a minute since I took computer organization, but the relevant wiki on 'Byte' gives some context.

该字节最初是可容纳单个字符的最小位数(我假设为标准ASCII).我们仍然使用ASCII标准，因此每个字符8位仍然有意义.例如，这句话是41个字节.对于我们的目的而言，这很容易计算并且实用.

The byte was originally the smallest number of bits that could hold a single character (I assume standard ASCII). We still use ASCII standard, so 8 bits per character is still relevant. This sentence, for instance, is 41 bytes. That's easily countable and practical for our purposes.

如果我们只有4位，那么除非使用2个字节表示单个字符，否则将只有16(2 ^ 4)个可能的字符，这在计算上效率更低.如果字节中有16位，则指令集中将有更多的死空间"，我们将允许65,536(2 ^ 16)个可能的字符，这将使计算机在执行字节级指令时运行效率降低，尤其是因为我们的字符集要小得多.

If we had only 4 bits, there would only be 16 (2^4) possible characters, unless we used 2 bytes to represent a single character, which is more inefficient computationally. If we had 16 bits in a byte, we would have a whole lot more 'dead space' in our instruction set, we would allow 65,536 (2^16) possible characters, which would make computers run less efficiently when performing byte-level instructions, especially since our character set is much smaller.

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